diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index 6273b75..eea2076 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@a36e1e52ff4a1c9e9c9be31551ee4712a6cb6bd0
         with:
           php-version: '8.1'
           tools: composer, infection
@@ -25,7 +25,7 @@ jobs:
         id: composer-cache
         run: |
           echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
-      - uses: actions/cache@v3
+      - uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}