diff --git a/.travis.yml b/.travis.yml
index f547d88..8599147 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: php
 php:
+  - '7.3'
   - 7.0
   - 7.1
   - 7.2
diff --git a/composer.json b/composer.json
index 5ff8c62..f617098 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
     "johnkary/phpunit-speedtrap": "^2.0",
     "phpunit/phpunit": "^6.5",
     "roave/security-advisories": "dev-master",
-    "squizlabs/php_codesniffer": "^3.3"
+    "squizlabs/php_codesniffer": "^3.4"
   },
   "scripts": {
     "build": "composer lint:syntax && composer lint:style && composer test:units && composer test:mutants",