diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 03020e8309..999ce46986 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,7 +46,7 @@ jobs:
 
     - name: 3. Validate Gradle wrapper
       if: matrix.java == 8 && matrix.mock-maker == 'mock-maker-default' # SINGLE-MATRIX-JOB
-      uses: gradle/wrapper-validation-action@v1 # https://github.com/gradle/wrapper-validation-action
+      uses: gradle/wrapper-validation-action@v1.0.3 # https://github.com/gradle/wrapper-validation-action
 
     - name: 4. Build and check reproducibility of artifacts (single job only)
       if: matrix.java == 8 && matrix.mock-maker == 'mock-maker-default' # SINGLE-MATRIX-JOB