diff --git a/docker-compose.yml b/docker-compose.yml
index 3ff769d..822c9e6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -132,7 +132,7 @@ services:
       TRAINS_AGENT_GIT_USER: ${TRAINS_AGENT_GIT_USER}
       TRAINS_AGENT_GIT_PASS: ${TRAINS_AGENT_GIT_PASS}
       TRAINS_AGENT_UPDATE_VERSION: ${TRAINS_AGENT_UPDATE_VERSION:->=0.15.0}
-      TRAINS_AGENT_DEFAULT_BASE_DOCKER: "ubuntu:18.04"
+      TRAINS_AGENT_DEFAULT_BASE_DOCKER: "ubuntu:18.04 -e LANG=C.UTF-8 -e PYTHONIOENCODING=UTF-8"
       AWS_ACCESS_KEY_ID: ${AWS_ACCESS_KEY_ID:-}
       AWS_SECRET_ACCESS_KEY: ${AWS_SECRET_ACCESS_KEY:-}
       AWS_DEFAULT_REGION: ${AWS_DEFAULT_REGION:-}