diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4316e327b..9c34eda91 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,10 +22,10 @@ jobs:
     if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -34,7 +34,7 @@ jobs:
           cache: gradle
 
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@0b6dd653ba04f4f93bf581ec31e66cbd7dcb644d # v4
 
       - name: Run lints
         run: ./scripts/lint
@@ -49,10 +49,10 @@ jobs:
     if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -61,7 +61,7 @@ jobs:
           cache: gradle
 
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@0b6dd653ba04f4f93bf581ec31e66cbd7dcb644d # v4
 
       - name: Build SDK
         # disable gradle daemon in CI because it is flakey
@@ -120,10 +120,10 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/openai-java' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -132,7 +132,7 @@ jobs:
           cache: gradle
 
       - name: Set up Gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@fe583dc97e032f41ccc310ea5176f2d7306abbc4 # v2
 
       - name: Run tests
         run: ./scripts/test
@@ -143,10 +143,10 @@ jobs:
     if: github.repository == 'openai/openai-java' && (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -154,7 +154,7 @@ jobs:
             21
           cache: gradle
       - name: Set up Gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@fe583dc97e032f41ccc310ea5176f2d7306abbc4 # v2
 
       - env: 
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
diff --git a/.github/workflows/create-releases.yml b/.github/workflows/create-releases.yml
index 31b64faec..4ceca7156 100644
--- a/.github/workflows/create-releases.yml
+++ b/.github/workflows/create-releases.yml
@@ -14,9 +14,9 @@ jobs:
     environment: publish
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
-      - uses: stainless-api/trigger-release-please@v1
+      - uses: stainless-api/trigger-release-please@bb6677c5a04578eec1ccfd9e1913b5b78ed64c61 # v1
         id: release
         with:
           repo: ${{ github.event.repository.full_name }}
@@ -24,7 +24,7 @@ jobs:
 
       - name: Set up Java
         if: ${{ steps.release.outputs.releases_created }}
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -34,7 +34,7 @@ jobs:
 
       - name: Set up Gradle
         if: ${{ steps.release.outputs.releases_created }}
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@fe583dc97e032f41ccc310ea5176f2d7306abbc4 # v2
 
       - name: Compile the openai-java-core project
         run: |
@@ -45,7 +45,7 @@ jobs:
           ./scripts/mock --daemon
 
       - name: Setup GraalVM
-        uses: graalvm/setup-graalvm@v1
+        uses: graalvm/setup-graalvm@03e8abf916fd0e281b2efe7b2da3378bb0a1d085 # v1
         with:
           java-version: 21
           distribution: 'graalvm-community'
diff --git a/.github/workflows/detect-breaking-changes.yml b/.github/workflows/detect-breaking-changes.yml
index 00f7bd6c0..e20819b1b 100644
--- a/.github/workflows/detect-breaking-changes.yml
+++ b/.github/workflows/detect-breaking-changes.yml
@@ -15,13 +15,13 @@ jobs:
         run: |
           echo "FETCH_DEPTH=$(expr ${{ github.event.pull_request.commits }} + 1)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           # Ensure we can check out the pull request base in the script below.
           fetch-depth: ${{ env.FETCH_DEPTH }}
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -29,7 +29,7 @@ jobs:
             21
           cache: gradle
       - name: Set up Gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@fe583dc97e032f41ccc310ea5176f2d7306abbc4 # v2
 
       - name: Detect breaking changes
         run: |
diff --git a/.github/workflows/publish-sonatype.yml b/.github/workflows/publish-sonatype.yml
index 23eccddc0..dc328f9f5 100644
--- a/.github/workflows/publish-sonatype.yml
+++ b/.github/workflows/publish-sonatype.yml
@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           distribution: temurin
           java-version: |
@@ -22,7 +22,7 @@ jobs:
           cache: gradle
 
       - name: Set up Gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@fe583dc97e032f41ccc310ea5176f2d7306abbc4 # v2
 
       - name: Compile the openai-java-core project
         run: |
@@ -33,7 +33,7 @@ jobs:
           ./scripts/mock --daemon
 
       - name: Setup GraalVM
-        uses: graalvm/setup-graalvm@v1
+        uses: graalvm/setup-graalvm@03e8abf916fd0e281b2efe7b2da3378bb0a1d085 # v1
         with:
           java-version: 21
           distribution: 'graalvm-community'
diff --git a/.github/workflows/release-doctor.yml b/.github/workflows/release-doctor.yml
index 6b856a834..796780d7a 100644
--- a/.github/workflows/release-doctor.yml
+++ b/.github/workflows/release-doctor.yml
@@ -13,7 +13,7 @@ jobs:
     if: github.repository == 'openai/openai-java' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch' || startsWith(github.head_ref, 'release-please') || github.head_ref == 'next')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Check release environment
         run: |