diff --git a/composer.json b/composer.json
index 8093deec2..9b154483f 100644
--- a/composer.json
+++ b/composer.json
@@ -11,15 +11,24 @@
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-        "geertw/ip-anonymizer": "^1.1",
         "dariuszp/cli-progress-bar": "^1.0",
-        "league/csv": "^8.2"
+        "league/csv": "^8.2",
+        "typisttech/imposter-plugin": "^0.6.0"
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         "pear/pear_exception": "1.0.*@dev",
         "podlove/comment-introspection": "dev-master",
         "phpunit/phpunit": "^6.5.14"
+    },
+    "extra": {
+        "imposter": {
+            "namespace": "Podlove\\Publisher\\Vendor",
+            "excludes": [
+                "podlove/webvtt-parser",
+                "podlove/podlove-timeline",
+                "dariuszp/cli-progress-bar"
+            ]
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index beba4ff27..a52c1ec6f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
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+            "version": "1.2.8",
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@@ -65,12 +65,16 @@
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+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
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-            "time": "2020-04-08T08:27:21+00:00"
+            "time": "2020-08-23T12:54:47+00:00"
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@@ -113,62 +117,29 @@
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-                    "email": "geert@gwirken.nl"
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-            "description": "IPv4 and IPv6 address anonymizer",
-            "time": "2017-06-24T13:15:14+00:00"
-        },
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             "name": "geoip2/geoip2",
-            "version": "v2.10.0",
+            "version": "v2.11.0",
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                 "url": "https://github.com/maxmind/GeoIP2-php.git",
-                "reference": "419557cd21d9fe039721a83490701a58c8ce784a"
+                "reference": "d01be5894a5c1a3381c58c9b1795cd07f96c30f7"
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-                "reference": "419557cd21d9fe039721a83490701a58c8ce784a",
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-                "maxmind-db/reader": "~1.5",
-                "maxmind/web-service-common": "~0.6",
-                "php": ">=5.6"
+                "maxmind-db/reader": "~1.8",
+                "maxmind/web-service-common": "~0.8",
+                "php": ">=7.2"
             },
             "require-dev": {
                 "friendsofphp/php-cs-fixer": "2.*",
-                "phpunit/phpunit": "5.*",
+                "phpunit/phpunit": "^8.0 || ^9.0",
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@@ -197,7 +168,7 @@
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             ],
-            "time": "2019-12-12T18:48:39+00:00"
+            "time": "2020-10-01T18:48:34+00:00"
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@@ -258,29 +229,29 @@
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-            "version": "v1.6.0",
+            "version": "v1.8.0",
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                 "url": "https://github.com/maxmind/MaxMind-DB-Reader-php.git",
-                "reference": "febd4920bf17c1da84cef58e56a8227dfb37fbe4"
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-                "reference": "febd4920bf17c1da84cef58e56a8227dfb37fbe4",
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+                "php": ">=7.2"
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+                "ext-maxminddb": "<1.8.0,>=2.0.0"
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-                "phpunit/phpcov": "^3.0",
-                "phpunit/phpunit": "5.*",
+                "phpunit/phpcov": ">=6.0.0",
+                "phpunit/phpunit": ">=8.0.0,<10.0.0",
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@@ -314,31 +285,31 @@
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                 "maxmind"
             ],
-            "time": "2019-12-19T22:59:03+00:00"
+            "time": "2020-10-01T17:30:21+00:00"
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-            "version": "v0.7.0",
+            "version": "v0.8.0",
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                 "url": "https://github.com/maxmind/web-service-common-php.git",
-                "reference": "74c996c218ada5c639c8c2f076756e059f5552fc"
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-                "reference": "74c996c218ada5c639c8c2f076756e059f5552fc",
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-                "phpunit/phpunit": "^4.8.36 || ^5.7 || ^6.5 || ^7.0",
+                "phpunit/phpunit": "^8.0 || ^9.0",
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@@ -360,20 +331,20 @@
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             "description": "Internal MaxMind Web Service API",
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-            "time": "2020-05-06T14:07:26+00:00"
+            "time": "2020-10-01T15:28:36+00:00"
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-            "version": "1.25.4",
+            "version": "1.25.5",
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                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "3022efff205e2448b560c833c6fbbf91c3139168"
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-                "reference": "3022efff205e2448b560c833c6fbbf91c3139168",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/1817faadd1846cd08be9a49e905dc68823bc38c0",
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@@ -447,7 +418,7 @@
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-            "time": "2020-05-22T07:31:27+00:00"
+            "time": "2020-07-23T08:35:51+00:00"
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@@ -499,67 +470,18 @@
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-                    "email": "sb@sebastian-bergmann.de",
-                    "role": "lead"
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-            "description": "Utility class for timing",
-            "homepage": "https://github.com/sebastianbergmann/php-timer/",
-            "keywords": [
-                "timer"
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-            "time": "2017-02-26T11:10:40+00:00"
-        },
         {
             "name": "piwik/device-detector",
-            "version": "3.12.6",
+            "version": "3.13.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/matomo-org/device-detector.git",
-                "reference": "4eb7b6d4d1a2ac1e8fee64fc73698fcb869d60f3"
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-                "reference": "4eb7b6d4d1a2ac1e8fee64fc73698fcb869d60f3",
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@@ -601,7 +523,7 @@
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-            "time": "2020-06-16T12:10:46+00:00"
+            "time": "2020-08-17T07:37:33+00:00"
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@@ -783,7 +705,7 @@
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-            "version": "v1.18.0",
+            "version": "v1.18.1",
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@@ -859,7 +781,7 @@
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-            "version": "v1.18.0",
+            "version": "v1.18.1",
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@@ -936,16 +858,16 @@
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-            "version": "v3.4.42",
+            "version": "v3.4.45",
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                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "7233ac2bfdde24d672f5305f2b3f6b5d741ef8eb"
+                "reference": "ec3c2ac4d881a4684c1f0317d2107f1a4152bad9"
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-                "reference": "7233ac2bfdde24d672f5305f2b3f6b5d741ef8eb",
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@@ -1005,7 +927,7 @@
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-            "time": "2020-05-11T07:51:54+00:00"
+            "time": "2020-09-18T15:58:55+00:00"
         },
         {
             "name": "twig/extensions",
@@ -1060,6 +982,7 @@
                 "i18n",
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+            "abandoned": true,
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         {
@@ -1126,6 +1049,170 @@
                 "templating"
             ],
             "time": "2020-02-11T15:31:23+00:00"
+        },
+        {
+            "name": "typisttech/imposter",
+            "version": "0.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/TypistTech/imposter.git",
+                "reference": "d124d428c967551be815fb4602c73025da2b2893"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/TypistTech/imposter/zipball/d124d428c967551be815fb4602c73025da2b2893",
+                "reference": "d124d428c967551be815fb4602c73025da2b2893",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": "^7.2"
+            },
+            "require-dev": {
+                "codeception/codeception": "^4.1",
+                "codeception/mockery-module": "^0.4.0",
+                "codeception/module-asserts": "^1.1",
+                "codeception/module-filesystem": "^1.0",
+                "squizlabs/php_codesniffer": "^3.5"
+            },
+            "suggest": {
+                "typisttech/imposter-plugin": "Composer plugin to integrate composer and imposter"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "0.4.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "TypistTech\\Imposter\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Typist Tech",
+                    "email": "imposter@typist.tech",
+                    "homepage": "https://typist.tech"
+                },
+                {
+                    "name": "Tang Rufus",
+                    "email": "tangrufus@gmail.com",
+                    "homepage": "https://typist.tech",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Wrapping all composer vendor packages inside your own namespace. Intended for WordPress plugins",
+            "homepage": "https://typist.tech/projects/imposter",
+            "keywords": [
+                "composer",
+                "dependency",
+                "monkey-patching",
+                "namespace",
+                "wordpress"
+            ],
+            "funding": [
+                {
+                    "url": "https://typist.tech/donation/",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.paypal.me/iAmTangRufus/30usd",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/tangrufus",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-04-15T19:55:54+00:00"
+        },
+        {
+            "name": "typisttech/imposter-plugin",
+            "version": "0.6.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/TypistTech/imposter-plugin.git",
+                "reference": "8dc39d4d22f0a8a09ecc4d198402f07591d57ae3"
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+            "dist": {
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+                "reference": "8dc39d4d22f0a8a09ecc4d198402f07591d57ae3",
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+            "require": {
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+                "php": "^7.2",
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+            "require-dev": {
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+                "codeception/module-asserts": "^1.1",
+                "codeception/module-cli": "^1.0",
+                "codeception/module-filesystem": "^1.0",
+                "composer/composer": "^1.9",
+                "squizlabs/php_codesniffer": "^3.5",
+                "typisttech/codeception-composer-project-module": "^0.1.1"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "0.5.x-dev"
+                },
+                "class": "TypistTech\\Imposter\\Plugin\\ImposterPlugin"
+            },
+            "autoload": {
+                "psr-4": {
+                    "TypistTech\\Imposter\\Plugin\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Typist Tech",
+                    "email": "imposter-plugin@typist.tech",
+                    "homepage": "https://www.typist.tech"
+                },
+                {
+                    "name": "Tang Rufus",
+                    "email": "tangrufus@gmail.com",
+                    "homepage": "https://www.typist.tech",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Composer plugin that wraps all composer vendor packages inside your own namespace. Intended for WordPress plugins",
+            "homepage": "https://www.typist.tech/projects/imposter-plugin",
+            "keywords": [
+                "composer",
+                "composer-plugin",
+                "dependency",
+                "monkey-patching",
+                "namespace",
+                "wordpress"
+            ],
+            "funding": [
+                {
+                    "url": "https://typist.tech/donation/",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.paypal.me/iAmTangRufus/30usd",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/tangrufus",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-04-15T20:23:11+00:00"
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     ],
     "packages-dev": [
@@ -1461,16 +1548,16 @@
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "5.2.0",
+            "version": "5.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "3170448f5769fe19f456173d833734e0ff1b84df"
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/3170448f5769fe19f456173d833734e0ff1b84df",
-                "reference": "3170448f5769fe19f456173d833734e0ff1b84df",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/069a785b2141f5bcf49f3e353548dc1cce6df556",
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556",
                 "shasum": ""
             },
             "require": {
@@ -1509,20 +1596,20 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2020-07-20T20:05:34+00:00"
+            "time": "2020-09-03T19:13:55+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.3.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651"
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/e878a14a65245fbe78f8080eba03b47c3b705651",
-                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
                 "shasum": ""
             },
             "require": {
@@ -1554,7 +1641,7 @@
                 }
             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2020-06-27T10:12:23+00:00"
+            "time": "2020-09-17T18:55:26+00:00"
         },
         {
             "name": "phpspec/prophecy",
@@ -1770,6 +1857,55 @@
             ],
             "time": "2015-06-21T13:50:34+00:00"
         },
+        {
+            "name": "phpunit/php-timer",
+            "version": "1.0.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-timer.git",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Utility class for timing",
+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "keywords": [
+                "timer"
+            ],
+            "time": "2017-02-26T11:10:40+00:00"
+        },
         {
             "name": "phpunit/php-token-stream",
             "version": "2.0.2",
@@ -1817,6 +1953,7 @@
             "keywords": [
                 "tokenizer"
             ],
+            "abandoned": true,
             "time": "2017-11-27T05:48:46+00:00"
         },
         {
diff --git a/includes/api/analytics.php b/includes/api/analytics.php
index 6f18af4b0..3b7eeb5ac 100644
--- a/includes/api/analytics.php
+++ b/includes/api/analytics.php
@@ -1,6 +1,6 @@
 <?php
 
-use League\Csv\Writer;
+use Podlove\Publisher\Vendor\League\Csv\Writer;
 
 add_action('rest_api_init', 'podlove_analytics_api_init');
 
diff --git a/includes/images.php b/includes/images.php
index 198c51aae..2973be15b 100644
--- a/includes/images.php
+++ b/includes/images.php
@@ -2,7 +2,7 @@
 
 use Podlove\Cache\HttpHeaderValidator;
 use Podlove\Model\Image;
-use Symfony\Component\Yaml\Yaml;
+use Podlove\Publisher\Vendor\Symfony\Component\Yaml\Yaml;
 
 // WP Cron: Image cache validation
 add_action('wp', function () {
diff --git a/lib/ajax/ajax.php b/lib/ajax/ajax.php
index b2dc164d6..529848492 100644
--- a/lib/ajax/ajax.php
+++ b/lib/ajax/ajax.php
@@ -2,8 +2,8 @@
 
 namespace Podlove\AJAX;
 
-use League\Csv\Writer;
 use Podlove\Model;
+use Podlove\Publisher\Vendor\League\Csv\Writer;
 
 class Ajax
 {
@@ -254,7 +254,7 @@ public function analytics_downloads_per_day()
 						SELECT
 							media_file_id, accessed_at, DATE(accessed_at) access_date, episode_id
 						FROM
-							'.Model\DownloadIntent::table_name().' di 
+							'.Model\DownloadIntent::table_name().' di
 							INNER JOIN '.Model\MediaFile::table_name()." mf ON mf.id = di.media_file_id
 						WHERE 1 = 1 {$episode_cond}
 						GROUP BY media_file_id, request_id, access_date
@@ -332,7 +332,7 @@ public function analytics_episode_downloads_per_hour()
 						LEFT JOIN '.Model\GeoAreaName::table_name()." geoname ON geoname.area_id = geo.`id` and geoname.language = \"{$lang}\"
 						LEFT JOIN ".Model\GeoAreaName::table_name()." geoname_p ON geoname_p.area_id = geo_p.`id` and geoname_p.language = \"{$lang}\"
 						LEFT JOIN ".Model\GeoAreaName::table_name()." geoname_pp ON geoname_pp.area_id = geo_pp.`id` and geoname_pp.language = \"{$lang}\"
-		
+
 						WHERE episode_id = {$episode_id}
 						GROUP BY hours_since_release, asset_id, client_name, system, source, context";
 
@@ -733,7 +733,7 @@ public static function analytics_global_top_episodes()
 				WHERE 1 = 1 AND '.self::analytics_date_condition().'
 				GROUP BY p.id
 				ORDER BY downloads DESC
-				LIMIT 10		
+				LIMIT 10
 			';
 
             $downloads = $wpdb->get_results($sql, ARRAY_N);
diff --git a/lib/geo_ip.php b/lib/geo_ip.php
index 993e8aa1a..2ce99d9ba 100644
--- a/lib/geo_ip.php
+++ b/lib/geo_ip.php
@@ -2,6 +2,8 @@
 
 namespace Podlove;
 
+use Podlove\Publisher\Vendor\GeoIp2;
+
 class Geo_Ip
 {
     const GEO_FILENAME = 'GeoLite2-City_20180206/GeoLite2-City.mmdb';
@@ -71,7 +73,7 @@ public static function enable_tracking()
     public static function is_db_valid()
     {
         try {
-            $reader = new \GeoIp2\Database\Reader(self::get_upload_file_path());
+            $reader = new GeoIp2\Database\Reader(self::get_upload_file_path());
 
             return true;
         } catch (\Exception $e) {
diff --git a/lib/log.php b/lib/log.php
index c40546ec3..c4bf0e9d5 100644
--- a/lib/log.php
+++ b/lib/log.php
@@ -2,8 +2,8 @@
 
 namespace Podlove;
 
-use Monolog\Handler\ErrorLogHandler;
-use Monolog\Logger;
+use Podlove\Publisher\Vendor\Monolog\Handler\ErrorLogHandler;
+use Podlove\Publisher\Vendor\Monolog\Logger;
 
 /**
  * Podlove Logger class.
diff --git a/lib/model/download_intent.php b/lib/model/download_intent.php
index 75fdc2f0d..5fbb6d797 100644
--- a/lib/model/download_intent.php
+++ b/lib/model/download_intent.php
@@ -2,6 +2,8 @@
 
 namespace Podlove\Model;
 
+use Podlove\Publisher\Vendor\GeoIp2;
+
 /**
  * Raw download intent data.
  *
@@ -15,7 +17,7 @@ public function add_geo_data($ip_string)
         $geoip_file = \Podlove\Geo_Ip::get_upload_file_path();
 
         try {
-            $reader = new \GeoIp2\Database\Reader($geoip_file);
+            $reader = new GeoIp2\Database\Reader($geoip_file);
         } catch (\Exception $e) {
             return $this;
         }
diff --git a/lib/model/image.php b/lib/model/image.php
index 3c2cd7981..1387b039f 100644
--- a/lib/model/image.php
+++ b/lib/model/image.php
@@ -4,7 +4,7 @@
 
 use Podlove\Cache\TemplateCache;
 use Podlove\Log;
-use Symfony\Component\Yaml\Yaml;
+use Podlove\Publisher\Vendor\Symfony\Component\Yaml\Yaml;
 
 /**
  * Image Object.
diff --git a/lib/modules/logging/logging.php b/lib/modules/logging/logging.php
index 8cf5e91c7..e352c8540 100644
--- a/lib/modules/logging/logging.php
+++ b/lib/modules/logging/logging.php
@@ -2,9 +2,9 @@
 
 namespace Podlove\Modules\Logging;
 
-use Monolog\Logger;
 use Podlove\Log;
 use Podlove\Model;
+use Podlove\Publisher\Vendor\Monolog\Logger;
 
 class Logging extends \Podlove\Modules\Base
 {
@@ -145,7 +145,7 @@ function filter_log() {
 		error   = filterWrapper.find(".log-level.log-level-400 input[type=checkbox]:checked").length,
 		log = $("#podlove-log")
 	;
-	
+
 	log.find(".log-entry.log-level-100").toggle(!!debug);
 	log.find(".log-entry.log-level-200").toggle(!!info);
 	log.find(".log-entry.log-level-300").toggle(!!warning);
diff --git a/lib/modules/logging/wpdbhandler.php b/lib/modules/logging/wpdbhandler.php
index ed5521309..28cf4c2c7 100644
--- a/lib/modules/logging/wpdbhandler.php
+++ b/lib/modules/logging/wpdbhandler.php
@@ -2,8 +2,8 @@
 
 namespace Podlove\Modules\Logging;
 
-use Monolog\Handler\AbstractProcessingHandler;
-use Monolog\Logger;
+use Podlove\Publisher\Vendor\Monolog\Handler\AbstractProcessingHandler;
+use Podlove\Publisher\Vendor\Monolog\Logger;
 
 class WPDBHandler extends AbstractProcessingHandler
 {
diff --git a/lib/modules/seasons/seasons.php b/lib/modules/seasons/seasons.php
index 832df134c..7319cd986 100644
--- a/lib/modules/seasons/seasons.php
+++ b/lib/modules/seasons/seasons.php
@@ -43,7 +43,7 @@ public function load()
         \Podlove\Template\Podcast::add_accessor(
             'seasons',
             ['\Podlove\Modules\Seasons\TemplateExtensions', 'accessorPodcastSeasons'],
-            3
+            4
         );
 
         \Podlove\Template\Episode::add_accessor(
diff --git a/lib/modules/social/social.php b/lib/modules/social/social.php
index 18eeeefd5..ba648a4a6 100644
--- a/lib/modules/social/social.php
+++ b/lib/modules/social/social.php
@@ -5,7 +5,7 @@
 use Podlove\Modules\Social\Model\ContributorService;
 use Podlove\Modules\Social\Model\Service;
 use Podlove\Modules\Social\Model\ShowService;
-use Symfony\Component\Yaml\Yaml;
+use Podlove\Publisher\Vendor\Symfony\Component\Yaml\Yaml;
 
 class Social extends \Podlove\Modules\Base
 {
@@ -299,7 +299,7 @@ public static function services_form_table($current_services = [], $form_base_na
 			<table class="podlove_alternating" border="0" cellspacing="0">
 				<thead>
 					<tr>
-						
+
 						<th><?php _e('Service', 'podlove-podcasting-plugin-for-wordpress'); ?></th>
 						<th><?php _e('Account/URL', 'podlove-podcasting-plugin-for-wordpress'); ?></th>
 						<th><?php _e('Title', 'podlove-podcasting-plugin-for-wordpress'); ?></th>
@@ -320,7 +320,7 @@ public static function services_form_table($current_services = [], $form_base_na
 
 			<script type="text/template" id="service-row-template-<?php echo $category; ?>">
 			<tr class="media_file_row podlove-service-table" data-service-id="{{service-id}}">
-				
+
 				<td class="podlove-service-column">
 					<select name="<?php echo $form_base_name; ?>[{{id}}][{{service-id}}][id]" class="chosen-image podlove-service-dropdown">
 						<option value=""><?php echo __('Choose Service', 'podlove-podcasting-plugin-for-wordpress'); ?></option>
diff --git a/lib/system_report.php b/lib/system_report.php
index 15673bbc9..6f54c9b30 100644
--- a/lib/system_report.php
+++ b/lib/system_report.php
@@ -2,6 +2,8 @@
 
 namespace Podlove;
 
+use Podlove\Publisher\Vendor\Monolog\Logger;
+
 class SystemReport
 {
     private $fields = [];
@@ -66,18 +68,15 @@ function ($plugin_path) {
             'player_version' => ['title' => 'Web Player Version', 'callback' => function () {
                 return \Podlove\get_webplayer_setting('version');
             }],
-            'twig_version' => ['title' => 'Twig Version', 'callback' => function () {
-                return \Twig_Environment::VERSION;
-            }],
             'monolog_version' => ['title' => 'Monolog Version', 'callback' => function () use (&$notices) {
-                if (\Monolog\Logger::API > 1) {
+                if (Logger::API > 1) {
                     $notices[] = sprintf(
                         'Monolog version is %s (required by another plugin) but Podlove Publisher requires 1.x. That means no logs can be written to the database.',
-                        \Monolog\Logger::API
+                        Logger::API
                     );
                 }
 
-                return \Monolog\Logger::API;
+                return Logger::API;
             }],
             'open_basedir' => ['callback' => function () use (&$notices) {
                 $open_basedir = trim(ini_get('open_basedir'));
@@ -252,29 +251,6 @@ function ($plugin_path) {
                         return 'duplicate guids: '.count($duplicates);
                     }
 
-                    return 'ok';
-                },
-            ],
-            'twig_versions' => [
-                'callback' => function () use (&$errors) {
-                    if (class_exists('Twig_Filter_Function')) {
-                        $path = (new \ReflectionClass('Twig_Filter_Function'))->getFileName();
-
-                        list($_, $rel_path) = explode(WP_PLUGIN_DIR, $path);
-                        list($_, $problem_plugin) = explode('/', $rel_path);
-
-                        $plugin_string = $problem_plugin ?? $path;
-
-                        $message = sprintf(
-                            'Podlove Publisher uses Twig to display templates. The plugin "%s" uses Twig in an older and incompatible version. You need to disable that plugin or ask the plugin author to upgrade Twig to at least v2.12.x. Otherwise, Podlove Publisher templates cannot be displayed.',
-                            $plugin_string
-                        );
-
-                        $errors[] = $message;
-
-                        return "incompatible plugin: {$plugin_string}";
-                    }
-
                     return 'ok';
                 },
             ],
diff --git a/lib/template/twig_filter.php b/lib/template/twig_filter.php
index e46de52ec..c6382e3bb 100644
--- a/lib/template/twig_filter.php
+++ b/lib/template/twig_filter.php
@@ -3,6 +3,7 @@
 namespace Podlove\Template;
 
 use Podlove\Model;
+use Podlove\Publisher\Vendor\Twig;
 
 /**
  * Apply Twig functionality and podcast/episode accessors to strings/templates.
@@ -92,7 +93,7 @@ public static function apply_to_html($html, $vars = [])
         if ($result === null) {
             try {
                 // simple Twig Env to render plain string
-                $env = new \Twig\Environment(new \Twig\Loader\ArrayLoader([]), ['autoescape' => false]);
+                $env = new Twig\Environment(new Twig\Loader\ArrayLoader([]), ['autoescape' => false]);
 
                 // no clue yet how this is possible but it happens
                 if (method_exists($env, 'createTemplate')) {
@@ -118,7 +119,7 @@ public static function apply_to_html($html, $vars = [])
     private static function getTwigLoader()
     {
         // file loader for internal use
-        $file_loader = new \Twig\Loader\FilesystemLoader();
+        $file_loader = new Twig\Loader\FilesystemLoader();
         $file_loader->addPath(implode(DIRECTORY_SEPARATOR, [\Podlove\PLUGIN_DIR, 'templates']), 'core');
 
         // other modules can register their own template directories/namespaces
@@ -130,20 +131,20 @@ private static function getTwigLoader()
         $loaders = [$file_loader, $db_loader];
         $loaders = apply_filters('podlove_twig_loaders', $loaders);
 
-        return new \Twig\Loader\ChainLoader($loaders);
+        return new Twig\Loader\ChainLoader($loaders);
     }
 
     private static function getTwigEnv()
     {
-        $twig = new \Twig\Environment(self::getTwigLoader(), ['autoescape' => false]);
+        $twig = new Twig\Environment(self::getTwigLoader(), ['autoescape' => false]);
         $twig->addExtension(new \Twig_Extensions_Extension_I18n());
         $twig->addExtension(new \Twig_Extensions_Extension_Date());
 
-        $formatBytesFilter = new \Twig\TwigFilter('formatBytes', function ($string) {
+        $formatBytesFilter = new Twig\TwigFilter('formatBytes', function ($string) {
             return \Podlove\format_bytes($string, 0);
         });
 
-        $padLeftFilter = new \Twig\TwigFilter('padLeft', function ($string, $padChar, $length) {
+        $padLeftFilter = new Twig\TwigFilter('padLeft', function ($string, $padChar, $length) {
             while (strlen($string) < $length) {
                 $string = $padChar.$string;
             }
@@ -151,7 +152,7 @@ private static function getTwigEnv()
             return $string;
         });
 
-        $wpautopFilter = new \Twig\TwigFilter('wpautop', function ($content) {
+        $wpautopFilter = new Twig\TwigFilter('wpautop', function ($content) {
             return \wpautop($content);
         });
 
@@ -161,37 +162,37 @@ private static function getTwigEnv()
 
         // add functions
         foreach (self::$template_tags as $tag) {
-            $func = new \Twig\TwigFunction($tag, function () use ($tag) {
+            $func = new Twig\TwigFunction($tag, function () use ($tag) {
                 return $tag();
             });
             $twig->addFunction($func);
         }
 
-        $func = new \Twig\TwigFunction('get_the_post_thumbnail_url', function ($post = null, $size = 'post-thumbnail') {
+        $func = new Twig\TwigFunction('get_the_post_thumbnail_url', function ($post = null, $size = 'post-thumbnail') {
             return get_the_post_thumbnail_url($post, $size);
         });
         $twig->addFunction($func);
 
         // shortcode_exists
-        $func = new \Twig\TwigFunction('shortcode_exists', function ($shortcode) {
+        $func = new Twig\TwigFunction('shortcode_exists', function ($shortcode) {
             return \shortcode_exists($shortcode);
         });
         $twig->addFunction($func);
 
         // Translation functions
-        $twig->addFunction(new \Twig\TwigFunction('__', function ($text, $domain = 'default') {
+        $twig->addFunction(new Twig\TwigFunction('__', function ($text, $domain = 'default') {
             return \__($text, $domain);
         }));
 
-        $twig->addFunction(new \Twig\TwigFunction('_x', function ($text, $context, $domain = 'default') {
+        $twig->addFunction(new Twig\TwigFunction('_x', function ($text, $context, $domain = 'default') {
             return \_x($text, $context, $domain);
         }));
 
-        $twig->addFunction(new \Twig\TwigFunction('_n', function ($single, $plural, $number, $domain = 'default') {
+        $twig->addFunction(new Twig\TwigFunction('_n', function ($single, $plural, $number, $domain = 'default') {
             return \_n($single, $plural, $number, $domain);
         }));
 
-        $twig->addFunction(new \Twig\TwigFunction('_nx', function ($single, $plural, $number, $context, $domain = 'default') {
+        $twig->addFunction(new Twig\TwigFunction('_nx', function ($single, $plural, $number, $context, $domain = 'default') {
             return \_x($single, $plural, $number, $context, $domain);
         }));