diff --git a/.github/workflows/docker-image.yaml b/.github/workflows/docker-image.yaml
index fcd6991..21d9649 100644
--- a/.github/workflows/docker-image.yaml
+++ b/.github/workflows/docker-image.yaml
@@ -11,10 +11,6 @@ on:
     branches:
       - 'main'
 
-env:
-  mtk_version: v2.0.2
-
-
 jobs:
   docker:
     runs-on: ubuntu-latest
diff --git a/Dockerfile b/Dockerfile
index 58dfbbe..f60e2c7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,8 @@ ARG MTK_VERSION
 # build MTK from source
 FROM golang:1.22-alpine as builder
 
+ENV MTK_VERSION=v2.0.2
+
 WORKDIR /go/src/github.com/skpr
 RUN apk add --virtual --update-cache git && \
 	rm -rf /tmp/* /var/tmp/* /var/cache/apk/* /var/cache/distfiles/*
diff --git a/renovate.json b/renovate.json
index 7cd58bb..b424430 100644
--- a/renovate.json
+++ b/renovate.json
@@ -10,16 +10,12 @@
         "groupName": "GitHub actions"
       }
     ],
-    // MTK version -- really wanted to put this in a .env or something, but this was as close as I could get
-    customManagers: [
+    "regexManagers": [
       {
-        customType: 'regex',
-        fileMatch: ['.github/workflows/docker-image.yaml'],
-        matchStrings: [
-          'env:\\s*mtk_version=(?<mtk_version>.*?)',
-        ],
-        depName: 'skpr/mtk',
-        datasourceTemplate: 'github-tags',
-      },
-    ],
+        "fileMatch": ["(^|/|\\.)Dockerfile$"],
+        "matchStrings": ["ENV MTK_VERSION=(?<currentValue>.*?)\n"],
+        "depNameTemplate": "skpr/mtk",
+        "datasourceTemplate": "github-tags"
+      }
+    ]
 }