diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b622a7..5878ed0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,13 +23,13 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           submodules: recursive
           fetch-depth: 0
 
       - name: Set up Python
-        uses: actions/setup-python@v7
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: "3.10"
 
@@ -58,18 +58,18 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           submodules: recursive
           fetch-depth: 0
 
       - name: Set up Python
-        uses: actions/setup-python@v7
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: "3.10"
 
       - name: Set up .NET
-        uses: actions/setup-dotnet@v6
+        uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6
         with:
           dotnet-version: "8.0.x"
 
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 639ffb1..e0f1795 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Run Release Please
-        uses: googleapis/release-please-action@v5
+        uses: googleapis/release-please-action@45996ed1f6d02564a971a2fa1b5860e934307cf7 # v5
         with:
           token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
           config-file: release-please-config.json