diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b693c05..59b79ed 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,6 +21,7 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
 
     steps:
       - name: "Checkout"
@@ -85,6 +86,7 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
         dependencies:
           - "lowest"
           - "highest"
@@ -127,6 +129,7 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
         dependencies:
           - "lowest"
           - "highest"
diff --git a/composer.json b/composer.json
index 51cd691..24d74cc 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
 	],
 	"require": {
 		"php": "^7.1 || ^8.0",
-		"phpstan/phpstan": "^0.12.86"
+		"phpstan/phpstan": "^0.12.92"
 	},
 	"conflict": {
 		"phpunit/phpunit": "<7.0"
diff --git a/tests/Rules/PHPUnit/data/assert-same-count.php b/tests/Rules/PHPUnit/data/assert-same-count.php
index d3e1d6b..73df333 100644
--- a/tests/Rules/PHPUnit/data/assert-same-count.php
+++ b/tests/Rules/PHPUnit/data/assert-same-count.php
@@ -33,7 +33,7 @@ public function testAssertSameWithCountMethodForCountableVariableIsNotOK()
 }
 
 class Bar implements \Countable {
-	public function count()
+	public function count(): int
 	{
 		return 1;
 	}