diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index a700570a..6cba395f 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -47,8 +47,10 @@ jobs:
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
       with:
         path: ~/.sonar/cache
-        key: ${{ runner.os }}-sonar
-        restore-keys: ${{ runner.os }}-sonar
+        # Content-addressed so the cache rotates when project config changes,
+        # with a prefix fallback for warm restores.
+        key: ${{ runner.os }}-sonar-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-sonar-
         
     - name: Cache Maven packages
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0