diff --git a/.travis.yml b/.travis.yml
index 5d6176ed..4e4c70f5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,8 +37,8 @@ script:
 
 after_success:
   - rm -f build/clover.xml
-  - wget https://phar.phpunit.de/phpcov-6.0.1.phar
-  - phpdbg -qrr phpcov-6.0.1.phar merge build --clover build/clover.xml
+  - wget https://phar.phpunit.de/phpcov-7.0.1.phar
+  - phpdbg -qrr phpcov-7.0.1.phar merge build --clover build/clover.xml
   - wget https://scrutinizer-ci.com/ocular.phar
   - php ocular.phar code-coverage:upload --format=php-clover build/clover.xml
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ed83602..edf73367 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,7 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 
 #### Changed
 
-* *Nothing*
+* [#656](https://github.com/shlinkio/shlink/issues/656) Updated to PHPUnit 9.
 
 #### Deprecated
 
diff --git a/bin/test/run-api-tests.sh b/bin/test/run-api-tests.sh
index 2a14b218..fae0c628 100755
--- a/bin/test/run-api-tests.sh
+++ b/bin/test/run-api-tests.sh
@@ -9,7 +9,7 @@ echo 'Starting server...'
 vendor/bin/mezzio-swoole start -d
 sleep 2
 
-vendor/bin/phpunit --order-by=random -c phpunit-api.xml --testdox --colors=always $*
+phpdbg -qrr vendor/bin/phpunit --order-by=random -c phpunit-api.xml --testdox --colors=always $*
 testsExitCode=$?
 
 vendor/bin/mezzio-swoole stop
diff --git a/composer.json b/composer.json
index f26c9eec..cdda9028 100644
--- a/composer.json
+++ b/composer.json
@@ -58,14 +58,14 @@
     },
     "require-dev": {
         "devster/ubench": "^2.0",
-        "dms/phpunit-arraysubset-asserts": "^0.1.0",
+        "dms/phpunit-arraysubset-asserts": "^0.2.0",
         "eaglewu/swoole-ide-helper": "dev-master",
         "infection/infection": "^0.15.0",
         "phpstan/phpstan": "^0.12.3",
-        "phpunit/phpunit": "^8.3",
+        "phpunit/phpunit": "^9.0.1",
         "roave/security-advisories": "dev-master",
         "shlinkio/php-coding-standard": "~2.1.0",
-        "shlinkio/shlink-test-utils": "^1.3",
+        "shlinkio/shlink-test-utils": "^1.4",
         "symfony/var-dumper": "^5.0"
     },
     "autoload": {
@@ -107,7 +107,7 @@
         "test:ci": [
             "@test:unit:ci",
             "@test:db:ci",
-            "@test:api"
+            "@test:api:ci"
         ],
         "test:unit": "phpdbg -qrr vendor/bin/phpunit --order-by=random --colors=always --coverage-php build/coverage-unit.cov --testdox",
         "test:unit:ci": "@test:unit --coverage-clover=build/clover.xml --coverage-xml=build/coverage-xml --log-junit=build/junit.xml",
@@ -129,6 +129,7 @@
         "test:db:postgres": "DB_DRIVER=postgres composer test:db:sqlite",
         "test:db:ms": "DB_DRIVER=mssql composer test:db:sqlite",
         "test:api": "bin/test/run-api-tests.sh",
+        "test:api:ci": "@test:api --coverage-php build/coverage-api.cov",
         "test:unit:pretty": "phpdbg -qrr vendor/bin/phpunit --order-by=random --colors=always --coverage-html build/coverage",
         "infect": "infection --threads=4 --min-msi=80 --log-verbosity=default --only-covered",
         "infect:ci": "@infect --coverage=build",