diff --git a/.travis.yml b/.travis.yml
index c825f93..9d12ef1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ php:
 
 env:
   - SYMFONY_VERSION="3.4.*"
-  - SYMFONY_VERSION="4.2.*"
+  - SYMFONY_VERSION="4.3.*"
   - PHPUNIT_VERSION="6.*"
   - PHPUNIT_VERSION="7.*"
 
@@ -25,7 +25,7 @@ matrix:
     - php: 7.3
       env:
         - PHPUNIT_VERSION="8.*"
-        - SYMFONY_VERSION="4.2.*"
+        - SYMFONY_VERSION="4.3.*"
 
 install:
   - rm -rf composer.lock vendor/*
diff --git a/makefile b/makefile
index 98eaf55..de21315 100644
--- a/makefile
+++ b/makefile
@@ -15,7 +15,7 @@ phpstan: phpstan.phar
 	./phpstan.phar analyse -c phpstan.neon -a vendor/autoload.php -l 7 src
 
 phpstan.phar:
-	wget https://raw.githubusercontent.com/phpstan/phpstan-shim/0.10.1/phpstan.phar && chmod 777 phpstan.phar
+	wget https://raw.githubusercontent.com/phpstan/phpstan-shim/0.11.8/phpstan.phar && chmod 777 phpstan.phar
 
 build: composer.phar test phpstan php_cs_fixer_check
 
@@ -26,4 +26,4 @@ php_cs_fixer_check: php-cs-fixer.phar
 	./php-cs-fixer.phar fix --config .php_cs src tests --dry-run
 
 php-cs-fixer.phar:
-	wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.14.0/php-cs-fixer.phar && chmod 777 php-cs-fixer.phar
+	wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.15.1/php-cs-fixer.phar && chmod 777 php-cs-fixer.phar