diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index e93b8ba..9053753 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v6
+      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
@@ -31,7 +31,7 @@ jobs:
       if: ${{ github.event_name == 'pull_request' }}
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v5
+      uses: actions/setup-dotnet@2016bd2012dba4e32de620c46fe006a3ac9f0602 # v5.0.1
       with:
         dotnet-version: |
           8.0.x
@@ -39,7 +39,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v4
+      uses: github/codeql-action/init@5d4e8d1aca955e8d8589aabd499c5cae939e33c7 # v4.31.9
       # Override language selection by uncommenting this and choosing your languages
       # with:
       #   languages: go, javascript, csharp, python, cpp, java
@@ -47,7 +47,7 @@ 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@v4
+      uses: github/codeql-action/autobuild@5d4e8d1aca955e8d8589aabd499c5cae939e33c7 # v4.31.9
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -61,4 +61,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v4
+      uses: github/codeql-action/analyze@5d4e8d1aca955e8d8589aabd499c5cae939e33c7 # v4.31.9
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d4b3406..13fad29 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,13 +16,13 @@ jobs:
   build:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           submodules: true
           persist-credentials: false
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v5
+        uses: actions/setup-dotnet@2016bd2012dba4e32de620c46fe006a3ac9f0602 # v5.0.1
         with:
           dotnet-version: |
             8.0.x
@@ -41,7 +41,7 @@ jobs:
         run: dotnet pack -c Release MaxMind.Db/MaxMind.Db.csproj
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
           name: nuget-packages
           path: MaxMind.Db/bin/Release/*.nupkg
@@ -55,7 +55,7 @@ jobs:
     if: github.event_name == 'release' && github.event.action == 'published'
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
           name: nuget-packages
           path: packages
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c7f26c0..1026761 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,13 +15,13 @@ jobs:
     runs-on: ${{ matrix.platform }}
     name: Dotnet on ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           submodules: true
           persist-credentials: false
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v5
+        uses: actions/setup-dotnet@2016bd2012dba4e32de620c46fe006a3ac9f0602 # v5.0.1
         with:
           dotnet-version: |
             8.0.x
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
index fbef643..04c5c7d 100644
--- a/.github/workflows/zizmor.yml
+++ b/.github/workflows/zizmor.yml
@@ -15,7 +15,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false