diff --git a/composer.json b/composer.json
index 3a649811..5a7ad5ec 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "infection/infection": "~0.15.3",
     "jangregor/phpstan-prophecy": "~0.8.1",
     "phpstan/extension-installer": "^1.1.0",
-    "phpstan/phpstan": "~0.12.65",
+    "phpstan/phpstan": "~0.12.66",
     "phpstan/phpstan-deprecation-rules": "~0.12.6",
     "phpstan/phpstan-phpunit": "~0.12.17",
     "phpstan/phpstan-strict-rules": "~0.12.7",
diff --git a/composer.lock b/composer.lock
index 31d083b2..885036a4 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4fbc61cd618bbf26fd2de37dc23b8cce",
+    "content-hash": "4491b8fa5152f19d3025249a2185cd51",
     "packages": [
         {
             "name": "composer/semver",
@@ -3961,16 +3961,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "0.12.65",
+            "version": "0.12.66",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "1c7658668b28f8d647a8b874372acf14c4352688"
+                "reference": "4110a2425c6bd53acbdfcda07885e87b66e9ba3e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/1c7658668b28f8d647a8b874372acf14c4352688",
-                "reference": "1c7658668b28f8d647a8b874372acf14c4352688",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/4110a2425c6bd53acbdfcda07885e87b66e9ba3e",
+                "reference": "4110a2425c6bd53acbdfcda07885e87b66e9ba3e",
                 "shasum": ""
             },
             "require": {
@@ -4001,7 +4001,7 @@
             "description": "PHPStan - PHP Static Analysis Tool",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan/issues",
-                "source": "https://github.com/phpstan/phpstan/tree/0.12.65"
+                "source": "https://github.com/phpstan/phpstan/tree/0.12.66"
             },
             "funding": [
                 {
@@ -4017,7 +4017,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-06T16:51:10+00:00"
+            "time": "2021-01-11T16:43:15+00:00"
         },
         {
             "name": "phpstan/phpstan-deprecation-rules",
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 20f16ef1..9d43bc14 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -31,12 +31,12 @@ parameters:
 			path: test/Unit/RuleSet/AbstractRuleSetTestCase.php
 
 		-
-			message: "#^Parameter \\#1 \\$arr1 of function array_merge expects array, array\\|false given\\.$#"
+			message: "#^Parameter \\#1 \\$arr1 of function array_merge expects array, array\\<string, false\\>\\|false given\\.$#"
 			count: 1
 			path: test/Unit/RuleSet/ExplicitRuleSetTestCase.php
 
 		-
-			message: "#^Parameter \\#1 \\$arr1 of function array_diff_key expects array, array\\|false given\\.$#"
+			message: "#^Parameter \\#1 \\$arr1 of function array_diff_key expects array, array\\<string, mixed\\>\\|false given\\.$#"
 			count: 1
 			path: test/Unit/RuleSet/ExplicitRuleSetTestCase.php