diff --git a/Dockerfile b/Dockerfile
index 318bd79..5199caf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,8 @@ RUN apt-get update && apt-get install -y \
   python3-venv \
   sudo
 
-RUN locale-gen ko_KR.UTF-8
+RUN echo "ko_KR.UTF-8 UTF-8" | sudo tee -a /etc/locale.gen
+RUN locale-gen
 
 ARG UID
 ARG GID
@@ -65,7 +66,8 @@ COPY --chown=${USERNAME}:${GID} .config/nvim /home/${USERNAME}/.config/nvim
 
 COPY --chown=${USERNAME}:${GID} .tmux.conf /home/${USERNAME}/.tmux.conf
 
-RUN locale-gen ko_KR.UTF-8 && echo 'export LANG=ko_KR.UTF-8' >> ~/.bashrc
+RUN echo 'export LANG=ko_KR.UTF-8' >> ~/.bashrc \
+  && echo 'export LC_ALL=ko_KR.UTF-8' >> ~/.bashrc
 
 CMD ["/bin/bash"]