diff --git a/package.json b/package.json
index 08927cfc15..50e8573817 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
   "dependencies": {
     "@ember-data/rfc395-data": "^0.0.4",
     "css-tree": "^3.0.1",
-    "ember-eslint-parser": "^0.5.4",
+    "ember-eslint-parser": "^0.5.6",
     "ember-rfc176-data": "^0.3.18",
     "eslint-utils": "^3.0.0",
     "estraverse": "^5.3.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 27c8b2c8cd..3d4eea3209 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -15,8 +15,8 @@ importers:
         specifier: ^3.0.1
         version: 3.0.1
       ember-eslint-parser:
-        specifier: ^0.5.4
-        version: 0.5.4(@babel/core@7.26.0)(@typescript-eslint/parser@8.11.0(eslint@8.57.1)(typescript@5.6.3))(eslint@8.57.1)
+        specifier: ^0.5.6
+        version: 0.5.6(@babel/core@7.26.0)(@typescript-eslint/parser@8.11.0(eslint@8.57.1)(typescript@5.6.3))(eslint@8.57.1)
       ember-rfc176-data:
         specifier: ^0.3.18
         version: 0.3.18
@@ -1173,8 +1173,8 @@ packages:
   config-chain@1.1.13:
     resolution: {integrity: sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==}
 
-  content-tag@2.0.2:
-    resolution: {integrity: sha512-qHRyTp02dgzRK2tsCFxZ1H289bZOuSLNpupr6prvnSFq4SFPmNlBKbbE5PCMb+8+Z1a1z+yCVtXvQIGUCCa3lQ==}
+  content-tag@2.0.3:
+    resolution: {integrity: sha512-htLIdtfhhKW2fHlFLnZH7GFzHSdSpHhDLrWVswkNiiPMZ5uXq5JfrGboQKFhNQuAAFF8VNB2EYUj3MsdJrKKpg==}
 
   convert-source-map@2.0.0:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
@@ -1322,8 +1322,8 @@ packages:
   electron-to-chromium@1.5.42:
     resolution: {integrity: sha512-gIfKavKDw1mhvic9nbzA5lZw8QSHpdMwLwXc0cWidQz9B15pDoDdDH4boIatuFfeoCatb3a/NGL6CYRVFxGZ9g==}
 
-  ember-eslint-parser@0.5.4:
-    resolution: {integrity: sha512-WA2ZfCT4ePtWfCjYlCLRBnl/xS4mWZ5S2xqBDFtx6j0RIKLZoSYWn252S3NyA4VavVb9DVjd06j1CBaLe9kjcA==}
+  ember-eslint-parser@0.5.6:
+    resolution: {integrity: sha512-mtneR5Z0TlGUR5tutJFv6xOjt5hLk532KoBooEb6rZXTXJbZvzEvXuUrYocCT4Os7IGHp3Elsjgd5tB9ufuPPQ==}
     engines: {node: '>=16.0.0'}
     peerDependencies:
       '@babel/core': ^7.23.6
@@ -2309,6 +2309,9 @@ packages:
     resolution: {integrity: sha512-wgp8yesWjFBL7bycA3hxwHRdsZGJhjhyP1dSxKVKrza0EPFYtn+mHtkVy6dvP1kGSjovyG5B8yNP6Frj0UFUJg==}
     engines: {node: '>=18'}
 
+  mathml-tag-names@2.1.3:
+    resolution: {integrity: sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==}
+
   mdast-util-from-markdown@0.8.5:
     resolution: {integrity: sha512-2hkTXtYYnr+NubD/g6KGBS/0mFmBcifAsI0yIWRiRo0PjVs6SSOSOdtzbp6kSGnShDN6G5aWZpKQ2lWRy27mWQ==}
 
@@ -3078,6 +3081,9 @@ packages:
     resolution: {integrity: sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==}
     engines: {node: '>= 0.4'}
 
+  svg-tags@1.0.0:
+    resolution: {integrity: sha512-ovssysQTa+luh7A5Weu3Rta6FJlFBBbInjOh722LIt6klpU2/HtdUbszju/G4devcvk8PGt7FCLv5wftu3THUA==}
+
   symbol-tree@3.2.4:
     resolution: {integrity: sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==}
 
@@ -4614,7 +4620,7 @@ snapshots:
       ini: 1.3.8
       proto-list: 1.2.4
 
-  content-tag@2.0.2: {}
+  content-tag@2.0.3: {}
 
   convert-source-map@2.0.0: {}
 
@@ -4751,14 +4757,16 @@ snapshots:
 
   electron-to-chromium@1.5.42: {}
 
-  ember-eslint-parser@0.5.4(@babel/core@7.26.0)(@typescript-eslint/parser@8.11.0(eslint@8.57.1)(typescript@5.6.3))(eslint@8.57.1):
+  ember-eslint-parser@0.5.6(@babel/core@7.26.0)(@typescript-eslint/parser@8.11.0(eslint@8.57.1)(typescript@5.6.3))(eslint@8.57.1):
     dependencies:
       '@babel/core': 7.26.0
       '@babel/eslint-parser': 7.25.9(@babel/core@7.26.0)(eslint@8.57.1)
       '@glimmer/syntax': 0.92.3
-      content-tag: 2.0.2
+      content-tag: 2.0.3
       eslint-scope: 7.2.2
       html-tags: 3.3.1
+      mathml-tag-names: 2.1.3
+      svg-tags: 1.0.0
     optionalDependencies:
       '@typescript-eslint/parser': 8.11.0(eslint@8.57.1)(typescript@5.6.3)
     transitivePeerDependencies:
@@ -5936,6 +5944,8 @@ snapshots:
       markdown-it: 14.1.0
       markdownlint-micromark: 0.1.10
 
+  mathml-tag-names@2.1.3: {}
+
   mdast-util-from-markdown@0.8.5:
     dependencies:
       '@types/mdast': 3.0.15
@@ -6774,6 +6784,8 @@ snapshots:
 
   supports-preserve-symlinks-flag@1.0.0: {}
 
+  svg-tags@1.0.0: {}
+
   symbol-tree@3.2.4: {}
 
   synckit@0.9.2:
diff --git a/tests/lib/rules-preprocessor/gjs-gts-parser-test.js b/tests/lib/rules-preprocessor/gjs-gts-parser-test.js
index d1c4c8ecd4..68112d30ee 100644
--- a/tests/lib/rules-preprocessor/gjs-gts-parser-test.js
+++ b/tests/lib/rules-preprocessor/gjs-gts-parser-test.js
@@ -272,7 +272,6 @@ const invalid = [
         {{noop}}
         <usedEl />
         <undef.x />
-        <non-std-html-tag />
       {{/let}}
       </template>
     `,
@@ -299,17 +298,6 @@ const invalid = [
         ruleId: 'no-undef',
         severity: 2,
       },
-      {
-        column: 10,
-        endColumn: 26,
-        endLine: 7,
-        line: 7,
-        message: "'non-std-html-tag' is not defined.",
-        messageId: 'undef',
-        nodeType: 'GlimmerElementNodePart',
-        ruleId: 'no-undef',
-        severity: 2,
-      },
     ],
   },
   {