diff --git a/composer.json b/composer.json
index 87cde9c1..b08e8853 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
     "phpstan/phpstan-phpunit": "~0.12.6",
     "phpstan/phpstan-strict-rules": "~0.12.2",
     "phpunit/phpunit": "^7.5.20",
-    "psalm/plugin-phpunit": "~0.8.1",
+    "psalm/plugin-phpunit": "~0.9.0",
     "symfony/filesystem": "^4.4.4",
     "vimeo/psalm": "^3.8.5"
   },
diff --git a/composer.lock b/composer.lock
index ebd9eff4..e8aeebec 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": "0d0d8af636a64f77d2299b0ca967d0ff",
+    "content-hash": "4ed9e5dd08a4eecf18432b57acdb1277",
     "packages": [
         {
             "name": "ergebnis/json-normalizer",
@@ -2674,22 +2674,22 @@
         },
         {
             "name": "psalm/plugin-phpunit",
-            "version": "0.8.1",
+            "version": "0.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/psalm/phpunit-psalm-plugin.git",
-                "reference": "021eb5a8c1c735f820a6bfb93b7a63f1d1c2c012"
+                "reference": "496c08f088d9e34e1947bca1de52b32b6571bad3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/psalm/phpunit-psalm-plugin/zipball/021eb5a8c1c735f820a6bfb93b7a63f1d1c2c012",
-                "reference": "021eb5a8c1c735f820a6bfb93b7a63f1d1c2c012",
+                "url": "https://api.github.com/repos/psalm/phpunit-psalm-plugin/zipball/496c08f088d9e34e1947bca1de52b32b6571bad3",
+                "reference": "496c08f088d9e34e1947bca1de52b32b6571bad3",
                 "shasum": ""
             },
             "require": {
                 "composer/semver": "^1.4",
                 "ocramius/package-versions": "^1.3",
-                "phpunit/phpunit": "^6.0 || ^7.0 || ^8.0",
+                "phpunit/phpunit": "^6.0 || ^7.0 || ^8.0 || ^9.0",
                 "vimeo/psalm": "^3.6.2 || dev-master"
             },
             "require-dev": {
@@ -2727,7 +2727,7 @@
                 }
             ],
             "description": "Psalm plugin for PHPUnit",
-            "time": "2020-01-10T00:31:44+00:00"
+            "time": "2020-02-15T02:43:43+00:00"
         },
         {
             "name": "psr/container",