diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4857572..21ce3da 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,6 +7,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: PHP-CS-Fixer
-        uses: docker://oskarstark/php-cs-fixer-ga
+        uses: docker://oskarstark/php-cs-fixer-ga:3.16.0
         with:
           args: --config=.php-cs-fixer.php --dry-run --using-cache=no -v --diff
diff --git a/tests/lib/RetailcrmReferencesTest.php b/tests/lib/RetailcrmReferencesTest.php
index ed55a7e..05714f3 100644
--- a/tests/lib/RetailcrmReferencesTest.php
+++ b/tests/lib/RetailcrmReferencesTest.php
@@ -38,6 +38,8 @@
 
 class RetailcrmReferencesTest extends RetailcrmTestCase
 {
+    private $retailcrmReferences;
+
     protected function setUp()
     {
         parent::setUp();