diff --git a/katacoda/Dockerfile b/katacoda/Dockerfile
index 207abab..7c4b24e 100644
--- a/katacoda/Dockerfile
+++ b/katacoda/Dockerfile
@@ -2,6 +2,9 @@ FROM ubuntu:20.04
 
 WORKDIR /root
 
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
 ARG RELEASE_HASH
 RUN RELEASE_HASH=${RELEASE_HASH} \
     apt-get update -y && apt-get install -y \
diff --git a/start/Dockerfile b/start/Dockerfile
index deb60b4..3b8ef2d 100644
--- a/start/Dockerfile
+++ b/start/Dockerfile
@@ -1,6 +1,10 @@
 FROM ubuntu:20.04
 
 WORKDIR /root
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
 ARG RELEASE_HASH
 RUN RELEASE_HASH=${RELEASE_HASH} \
     apt-get update -y && apt-get install -y \