diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f5daa22..8edba23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
 
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5
         with:
           distribution: 'zulu'
           java-version: 21
@@ -34,7 +34,7 @@ jobs:
 
       - name: Upload reports
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: reports
           path: build/reports
diff --git a/.github/workflows/gradle-wrapper-validation.yml b/.github/workflows/gradle-wrapper-validation.yml
index 19c7c20..1158ded 100644
--- a/.github/workflows/gradle-wrapper-validation.yml
+++ b/.github/workflows/gradle-wrapper-validation.yml
@@ -6,5 +6,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: gradle/actions/wrapper-validation@v4
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+      - uses: gradle/actions/wrapper-validation@748248ddd2a24f49513d8f472f81c3a07d4d50e1 # v4