diff --git a/.travis.yml b/.travis.yml
index 4ed7b1c..517a124 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,6 +28,7 @@ matrix:
     - php: 7.4
       env:
         - SYMFONY_REQUIRE="5.0.*"
+        - PHPUNIT_VERSION="9.*"
 
 before_install:
     - phpenv config-rm xdebug.ini || echo "xDebug not disabled"
diff --git a/README.md b/README.md
index 9f3cdfc..2548524 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ It also includes a `StaticArrayCache` that will be automatically configured as m
     </phpunit>
     ```
     
-4. Make sure you also have `phpunit/phpunit` available as a `dev` dependency (**versions 7 and 8 are supported with the built in listener/extension**) to run your tests. 
+4. Make sure you also have `phpunit/phpunit` available as a `dev` dependency (**versions 7, 8 and 9 are supported with the built in listener/extension**) to run your tests. 
    Alternatively this bundle is also compatible with `symfony/phpunit-bridge` and its `simple-phpunit` script. 
    (Note: you may need to make sure the phpunit-bridge requires the correct PHPUnit 7+ Version using the environment variable `SYMFONY_PHPUNIT_VERSION`). 
 
diff --git a/composer.json b/composer.json
index a5fb721..dbe322c 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "doctrine/doctrine-bundle": "^1.11 || ^2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0 || ^8.0",
+    "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0",
     "symfony/yaml": "^3.4 || ^4.3 || ^5.0",
     "symfony/phpunit-bridge": "^4.3 || ^5.0",
     "phpstan/phpstan": "^0.12"