diff --git a/composer.json b/composer.json
index 33a6e68..d01217c 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0 || ^8.5.13",
-        "phpstan/phpstan": "^0.12.59"
+        "phpstan/phpstan": "^1.5"
     },
     "autoload": {
         "psr-4": { "Seld\\JsonLint\\": "src/Seld/JsonLint/" }
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 0c0f03f..aa3323d 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -6,4 +6,4 @@ parameters:
         - tests/
 
     ignoreErrors:
-        - '/Method JsonParserTest::[a-zA-Z0-9]+\(\) has no return typehint/'
+        - '/Method JsonParserTest::[a-zA-Z0-9]+\(\) has no return type/'
diff --git a/src/Seld/JsonLint/DuplicateKeyException.php b/src/Seld/JsonLint/DuplicateKeyException.php
index 1f7670c..d5a579b 100644
--- a/src/Seld/JsonLint/DuplicateKeyException.php
+++ b/src/Seld/JsonLint/DuplicateKeyException.php
@@ -14,6 +14,7 @@
 class DuplicateKeyException extends ParsingException
 {
     /**
+     * @phpstan-ignore-next-line
      * @var array{key: string, line: int}
      */
     protected $details;