diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 9fd99f2..fb00a7b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -14,23 +14,23 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
         with:
           distribution: temurin
           java-version: 21
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@v1.0.6
+        uses: gradle/wrapper-validation-action@8d49e559aae34d3e0eb16cde532684bc9702762b # v1.0.6
       - name: Checkstyle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with:
           arguments: checkstyleMain checkstyleTest
       - name: PMD
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with:
           arguments: pmdMain pmdTest
       - name: Test
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with:
           arguments: test
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index e4be58b..2e01b77 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -12,20 +12,20 @@ jobs:
     needs: check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
         with:
           distribution: temurin
           java-version: 21
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@v1.0.6
+        uses: gradle/wrapper-validation-action@8d49e559aae34d3e0eb16cde532684bc9702762b # v1.0.6
       - name: Build sourcesJar and javadocJar
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with:
           arguments: sourcesJar javadocJar
       - name: Publish to MavenCentral
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with:
           arguments: publishMavenPublicationToSonatypeRepository --max-workers 1 closeAndReleaseSonatypeStagingRepository
         env:
diff --git a/.github/workflows/repository-maintenance.yml b/.github/workflows/repository-maintenance.yml
index 4bc7952..db3d309 100644
--- a/.github/workflows/repository-maintenance.yml
+++ b/.github/workflows/repository-maintenance.yml
@@ -15,8 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4.2.1
-      - uses: actions/setup-java@v4.4.0
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/setup-java@b36c23c0d998641eff861008f374ee103c25ac73 # v4.4.0
         name: Setup Java
         with:
           distribution: temurin