diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index fff3cfa4..5aeae65b 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -51,6 +51,10 @@ jobs:
           ini-values: error_reporting=E_ALL & ~E_DEPRECATED, display_errors=On
           coverage: none
 
+      - name: Enable creation of `composer.lock` file
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: composer config --unset lock
+
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4c7d784e..99609523 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -123,6 +123,10 @@ jobs:
           sirbrillig/phpcs-variable-analysis:"2.x"
           wp-coding-standards/wpcs:"dev-develop"
 
+      - name: Enable creation of `composer.lock` file
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: composer config --unset lock
+
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
diff --git a/composer.json b/composer.json
index c65c23bb..e02138dc 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,8 @@
 	"config": {
 		"allow-plugins": {
 			"dealerdirect/phpcodesniffer-composer-installer": true
-		}
+		},
+		"lock": false
 	},
 	"scripts": {
 		"test-ruleset": "bin/ruleset-tests",