diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5454891..5409e18 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
           php-version: "${{ matrix.php-version }}"
           ini-values: "${{ env.INI_VALUES }}"
           tools: composer-normalize,composer-require-checker,composer-unused
-      - uses: "ramsey/composer-install@v3"
+      - uses: "ramsey/composer-install@4.0.0"
 
       - run: "composer validate --strict"
       - run: "composer-normalize --dry-run"
@@ -54,7 +54,7 @@ jobs:
           coverage: "${{ matrix.code-coverage }}"
           php-version: "${{ matrix.php-version }}"
           ini-values: "${{ env.INI_VALUES }}"
-      - uses: "ramsey/composer-install@v3"
+      - uses: "ramsey/composer-install@4.0.0"
 
       - run: "vendor/bin/phpunit --no-coverage --no-logging"
         if: ${{ matrix.code-coverage == 'none' }}
@@ -79,7 +79,7 @@ jobs:
           coverage: "none"
           php-version: "${{ matrix.php-version }}"
           ini-values: "${{ env.INI_VALUES }}"
-      - uses: "ramsey/composer-install@v3"
+      - uses: "ramsey/composer-install@4.0.0"
 
       - run: "vendor/bin/php-cs-fixer fix --verbose --dry-run --diff"
 
@@ -98,6 +98,6 @@ jobs:
           coverage: "none"
           php-version: "${{ matrix.php-version }}"
           ini-values: "${{ env.INI_VALUES }}"
-      - uses: "ramsey/composer-install@v3"
+      - uses: "ramsey/composer-install@4.0.0"
 
       - run: "vendor/bin/phpstan analyse --no-progress --error-format=github"