diff --git a/.github/infrastructure.yml b/.github/infrastructure.yml
index 21c814c4..92164bfe 100644
--- a/.github/infrastructure.yml
+++ b/.github/infrastructure.yml
@@ -47,7 +47,7 @@ branches:
           - context: test (16)
           - context: test (18)
           - context: test (19)
-          - context: test (20)
+          - context: test (20.5.0)
           - context: typescript (5.0.4)
           - context: typescript (5.1.6)
           - context: typescript (latest)
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6a94fe70..dfa50709 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -285,7 +285,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
-          - 20
+          - 20.5.0
           - 19
           - 18
           - 16
diff --git a/src/plugins/decorators/plugin.ts b/src/plugins/decorators/plugin.ts
index 260cc101..3e534fa0 100644
--- a/src/plugins/decorators/plugin.ts
+++ b/src/plugins/decorators/plugin.ts
@@ -114,7 +114,8 @@ const plugin = (options?: tscu.LoadTsconfigOptions): Plugin => {
          */
         const source: string = cast(await mlly.getSource(url))
 
-        // do nothing if module does contain decorators
+        // do nothing if module does not contain decorators
+        DECORATOR_REGEX.lastIndex = 0
         if (!DECORATOR_REGEX.test(source)) return null
 
         // transpile module to emit decorator metadata