diff --git a/.travis.yml b/.travis.yml
index 095fb584a..d10e9a3fa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,13 +40,13 @@ install:
     - rm $HOME/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini;
     - echo "memory_limit=2048M" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
-    - composer install --ignore-platform-reqs # ext-amqp is not installed
+    - composer install
     - if [ "$FUNCTIONAL_TESTS" = true ]; then docker --version; fi
     - if [ "$FUNCTIONAL_TESTS" = true ]; then docker-compose --version; fi
     - if [ "$FUNCTIONAL_TESTS" = true ]; then bin/dev -b; fi
 
 script:
-    - if [ "$PHPSTAN" = true ]; then php -d memory_limit=512M bin/phpstan analyse -l 1 -c phpstan.neon pkg/amqp-ext pkg/async-event-dispatcher pkg/dbal pkg/enqueue pkg/enqueue-bundle pkg/fs pkg/gearman pkg/job-queue pkg/null pkg/pheanstalk pkg/redis pkg/simple-client pkg/sqs pkg/stomp pkg/test pkg/rdkafka; fi
+    - if [ "$PHPSTAN" = true ]; then composer require "phpstan/phpstan:0.7.0" ; php -d memory_limit=512M bin/phpstan analyse -l 1 -c phpstan.neon pkg/amqp-ext pkg/async-event-dispatcher pkg/dbal pkg/enqueue pkg/enqueue-bundle pkg/fs pkg/gearman pkg/job-queue pkg/null pkg/pheanstalk pkg/redis pkg/simple-client pkg/sqs pkg/stomp pkg/test pkg/rdkafka; fi
     - if [ "$PHP_CS_FIXER" = true ]; then IFS=$'\n'; COMMIT_SCA_FILES=($(git diff --name-only --diff-filter=ACMRTUXB "${TRAVIS_COMMIT_RANGE}")); unset IFS; fi
     - if [ "$PHP_CS_FIXER" = true ]; then ./bin/php-cs-fixer fix --config=.php_cs.dist -v --dry-run --stop-on-violation --using-cache=no --path-mode=intersection -- "${COMMIT_SCA_FILES[@]}"; fi
     - if [ "$UNIT_TESTS" = true ]; then bin/phpunit --exclude-group=functional; fi
diff --git a/composer.json b/composer.json
index 49c274e6d..5b1aea2ef 100644
--- a/composer.json
+++ b/composer.json
@@ -35,8 +35,7 @@
     "symfony/event-dispatcher": "^2.8|^3",
     "symfony/console": "^2.8|^3",
     "friendsofphp/php-cs-fixer": "^2",
-    "empi89/php-amqp-stubs": "*@dev",
-    "phpstan/phpstan": "^0.7.0"
+    "empi89/php-amqp-stubs": "*@dev"
   },
   "autoload": {
     "files": [
@@ -51,7 +50,12 @@
     }
   },
   "config": {
-    "bin-dir": "bin"
+    "bin-dir": "bin",
+    "platform": {
+      "ext-amqp": "1.7",
+      "ext-gearman": "1.1",
+      "ext-rdkafka": "3.3"
+    }
   },
   "repositories": [
     {