diff --git a/docker/Dockerfile b/docker/Dockerfile
index 41768df4f..7123937e2 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.4-slim
+FROM python:3.5-slim
 
 ARG HTTP_PROXY
 ARG HTTPS_PROXY