diff --git a/.github/workflows/basics.yml b/.github/workflows/basics.yml
index 1ae494f9..6c20a10d 100644
--- a/.github/workflows/basics.yml
+++ b/.github/workflows/basics.yml
@@ -54,6 +54,9 @@ jobs:
       # @link https://github.com/marketplace/actions/install-composer-dependencies
       - name: Install Composer dependencies
         uses: "ramsey/composer-install@v2"
+        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")
 
       - name: 'Validate XML against schema and check code style'
         run: ./bin/xml-lint
diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index 3082f5b8..3de35f83 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -78,6 +78,9 @@ jobs:
       - name: Install Composer dependencies - normal
         if: ${{ startsWith( matrix.php, '8' ) == false && matrix.php != 'latest' }}
         uses: "ramsey/composer-install@v2"
+        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")
 
       # PHPUnit 7.x does not allow for installation on PHP 8, so ignore platform
       # requirements to get PHPUnit 7.x to install on nightly.
@@ -86,6 +89,7 @@ jobs:
         uses: "ramsey/composer-install@v2"
         with:
           composer-options: --ignore-platform-reqs
+          custom-cache-suffix: $(date -u -d "-0 month -$(($(date +%d)-1)) days" "+%F")
 
       - name: Lint against parse errors
         if: matrix.phpcs_version == 'dev-master'
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b55f5164..0e4cb6cf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -45,6 +45,9 @@ jobs:
 
       - name: Install Composer dependencies
         uses: "ramsey/composer-install@v2"
+        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")
 
       - name: Lint against parse errors
         run: ./bin/php-lint --checkstyle | cs2pr
@@ -140,6 +143,9 @@ jobs:
       - name: Install Composer dependencies - normal
         if: ${{ startsWith( matrix.php, '8' ) == false }}
         uses: "ramsey/composer-install@v2"
+        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")
 
       # PHPUnit 7.x does not allow for installation on PHP 8, so ignore platform
       # requirements to get PHPUnit 7.x to install on nightly.
@@ -148,6 +154,7 @@ jobs:
         uses: "ramsey/composer-install@v2"
         with:
           composer-options: --ignore-platform-reqs
+          custom-cache-suffix: $(date -u -d "-0 month -$(($(date +%d)-1)) days" "+%F")
 
       - name: Run the unit tests - PHP 5.4 - 8.0
         if: matrix.php < '8.1'