diff --git a/Dockerfile b/Dockerfile
index 8386d80..96f8e2f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -77,7 +77,7 @@ run npm install -g npx
 
 # fix locale so we can run tmux
 run sed -i 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen
-ENV LANG='en_US.utf8' LANGUAGE='en_US:en' LC_ALL='en_US.utf8'
+ENV LANG='en_US.utf8' LANGUAGE='en_US:en' LC_ALL='en_US.utf8' TZ='America/Chicago'
 run locale-gen
 
 # expand libc sources