diff --git a/.travis.yml b/.travis.yml
index 47275da..efe551d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,8 @@ language: php
 
 php:
   - 7.2
-  - 7.3
   - 7.4
+  - 'nightly'
 
 env:
   global:
@@ -19,14 +19,19 @@ matrix:
     - php: 7.2
       env: STATIC_ANALYSIS=1 DEFAULT=0
 
-before_script:
-  - composer update --no-interaction
-
-  - if [[ $STATIC_ANALYSIS == 1 ]]; then composer stan-setup; fi
+install:
+  - |
+      if [[ $TRAVIS_PHP_VERSION == 'nightly' ]]; then
+        composer install --no-interaction --ignore-platform-reqs
+      elif [[ $STATIC_ANALYSIS == 1 ]]; then
+        composer stan-setup
+      else
+        composer install
+      fi
 
 script:
-  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION != 7.3 ]]; then vendor/bin/phpunit; fi
-  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION == 7.3 ]]; then vendor/bin/phpunit --coverage-clover=clover.xml; fi
+  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION != 7.4 ]]; then vendor/bin/phpunit; fi
+  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION == 7.4 ]]; then vendor/bin/phpunit --coverage-clover=clover.xml; fi
 
   - |
       if [[ $STATIC_ANALYSIS == 1 ]]; then
@@ -36,7 +41,7 @@ script:
   - if [[ $PHPCS == 1 ]]; then composer cs-check; fi
 
 after_success:
-  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION == 7.3 ]]; then bash <(curl -s https://codecov.io/bash); fi
+  - if [[ $DEFAULT == 1 && $TRAVIS_PHP_VERSION == 7.4 ]]; then bash <(curl -s https://codecov.io/bash); fi
 
 notifications:
   email: false
diff --git a/composer.json b/composer.json
index e96d8ed..657ec47 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     },
     "require-dev": {
         "cakephp/cakephp-codesniffer": "^4.0",
-        "phpunit/phpunit": "~8.5.0",
+        "phpunit/phpunit": "^8.5 || ^9.3",
         "cakephp/bake": "^2.0"
     },
     "autoload": {