diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 46871d7..c0b1569 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5.1.0
 
       - name: Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
           node-version: '22'
           cache: 'npm'
@@ -35,7 +35,7 @@ jobs:
         run: npm run build
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@f3e473d116dcccaddc5834248c87452386958240 # 2.37.2
         with:
           php-version: '8.2'
           coverage: none
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 059a873..eaa01c2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,7 +13,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5.1.0
 
       # The tag is what everyone installs, so it has to agree with the two
       # places the version is written. `VERSION` is also the cache buster the
@@ -27,7 +27,7 @@ jobs:
             || { echo "VERSION constant does not say ${VERSION}"; exit 1; }
 
       - name: Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
           node-version: '22'
           cache: 'npm'