diff --git a/rector.php b/rector.php
index 738f3cd23109..d8af415767df 100644
--- a/rector.php
+++ b/rector.php
@@ -15,7 +15,6 @@
 use Rector\CodeQuality\Rector\Empty_\SimplifyEmptyCheckOnEmptyArrayRector;
 use Rector\CodeQuality\Rector\Expression\InlineIfToExplicitIfRector;
 use Rector\CodeQuality\Rector\Foreach_\UnusedForeachValueToArrayKeysRector;
-use Rector\CodeQuality\Rector\FuncCall\ChangeArrayPushToArrayAssignRector;
 use Rector\CodeQuality\Rector\FuncCall\CompactToVariablesRector;
 use Rector\CodeQuality\Rector\FunctionLike\SimplifyUselessVariableRector;
 use Rector\CodeQuality\Rector\Ternary\TernaryEmptyArrayArrayDimFetchToCoalesceRector;
@@ -183,7 +182,6 @@
         InlineIfToExplicitIfRector::class,
         PreparedValueToEarlyReturnRector::class,
         UnusedForeachValueToArrayKeysRector::class,
-        ChangeArrayPushToArrayAssignRector::class,
         RemoveErrorSuppressInTryCatchStmtsRector::class,
         FuncGetArgsToVariadicParamRector::class,
         MakeInheritedMethodVisibilitySameAsParentRector::class,
@@ -204,4 +202,4 @@
         // keep '\\' prefix string on string '\Foo\Bar'
         StringClassNameToClassConstantRector::SHOULD_KEEP_PRE_SLASH => true,
     ])
-    ->withCodeQualityLevel(34);
+    ->withCodeQualityLevel(40);
diff --git a/system/Test/Mock/MockCache.php b/system/Test/Mock/MockCache.php
index 67f8aee86ad1..6699ad266c63 100644
--- a/system/Test/Mock/MockCache.php
+++ b/system/Test/Mock/MockCache.php
@@ -62,7 +62,7 @@ public function get(string $key)
     {
         $key = static::validateKey($key, $this->prefix);
 
-        return array_key_exists($key, $this->cache) ? $this->cache[$key] : null;
+        return $this->cache[$key] ?? null;
     }
 
     /**