diff --git a/.travis.yml b/.travis.yml
index 63de691cf..75d1e54f5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,7 +21,7 @@ env:
    - DISCOVERY_NODES=127.0.0.1:7171
    - HTTP_PERF=tcp://0.0.0.0:0
    - DOCKER_COMPOSE_VERSION=1.24.1
-   - ZK_VERSION=3.5.4-beta
+   - ZK_VERSION=3.5.5
 
 before_install:
   # docker-compose