diff --git a/.github/workflows/check-dist.yml b/.github/workflows/check-dist.yml
index 595d048..71cd843 100644
--- a/.github/workflows/check-dist.yml
+++ b/.github/workflows/check-dist.yml
@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
       - name: Set Node.js 20.x
-        uses: actions/setup-node@v4.0.2
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
           node-version: 20.x
 
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index d01412f..d944cd1 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -38,11 +38,11 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
+        uses: github/codeql-action/init@4355270be187e1b672a7a1c7c7bae5afdc1ab94a # v3
         with:
           languages: ${{ matrix.language }}
           source-root: src
@@ -54,7 +54,7 @@ jobs:
       # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
       # If this step fails, then you should remove it and run the build manually (see below)
       - name: Autobuild
-        uses: github/codeql-action/autobuild@v3
+        uses: github/codeql-action/autobuild@4355270be187e1b672a7a1c7c7bae5afdc1ab94a # v3
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 https://git.io/JvXDl
@@ -68,4 +68,4 @@ jobs:
       #   make release
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v3
+        uses: github/codeql-action/analyze@4355270be187e1b672a7a1c7c7bae5afdc1ab94a # v3
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0aaca98..8ec6753 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -17,12 +17,12 @@ jobs:
       pull-requests: write # to be able to comment on released pull requests
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
         with:
           fetch-depth: 0
 
       - name: Set Node.js 20.x
-        uses: actions/setup-node@v4.0.2
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
           node-version: 20.x
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7477651..f6bac4e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,10 +6,10 @@ jobs:
   build: # make sure build/ci work properly
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
       - name: Set Node.js 20.x
-        uses: actions/setup-node@v4.0.2
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
           node-version: 20.x
 
@@ -26,7 +26,7 @@ jobs:
       contents: write # to be able to delete branches
       pull-requests: read # to be able to confirm that branches don't have associated PRs
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
       - uses: ./
         with: