diff --git a/.github/workflows/cs.yml b/.github/workflows/cs.yml
index e1f520f..5ade72e 100644
--- a/.github/workflows/cs.yml
+++ b/.github/workflows/cs.yml
@@ -39,7 +39,7 @@ jobs:
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-composer-dependencies
       - name: Install Composer dependencies
-        uses: ramsey/composer-install@v3
+        uses: ramsey/composer-install@v4
         with:
           # Bust the cache at least once a month - output format: YYYY-MM-DD.
           custom-cache-suffix: $(date -u -d "-0 month -$(($(date +%d)-1)) days" "+%F")
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 9e10df8..bef4ba5 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -45,7 +45,7 @@ jobs:
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-composer-dependencies
       - name: Install Composer dependencies
-        uses: ramsey/composer-install@v3
+        uses: ramsey/composer-install@v4
         with:
           # Bust the cache at least once a month - output format: YYYY-MM-DD.
           custom-cache-suffix: $(date -u -d "-0 month -$(($(date +%d)-1)) days" "+%F")
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index 775bc1a..8cee875 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -28,7 +28,7 @@ jobs:
           tools: composer, cs2pr
 
       - name: Install PHP dependencies
-        uses: ramsey/composer-install@v3
+        uses: ramsey/composer-install@v4
         with:
           composer-options: '--prefer-dist --no-scripts'
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0f8036f..9cdf6fe 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -68,7 +68,7 @@ jobs:
         run: composer config --unset platform.php
 
       - name: "Install Composer dependencies"
-        uses: ramsey/composer-install@v3
+        uses: ramsey/composer-install@v4
         with:
           # Force a `composer update` run.
           dependency-versions: "highest"