diff --git a/config/devtainer/Dockerfile b/config/devtainer/Dockerfile
index 22ec48cc..7458b109 100644
--- a/config/devtainer/Dockerfile
+++ b/config/devtainer/Dockerfile
@@ -1,7 +1,7 @@
 FROM archlinux:latest
 
 RUN pacman -Syu --noconfirm \
-    && pacman -S --noconfirm openssh sudo jdk17-openjdk wget which procps-ng zsh git curlie micro ripgrep python3 exa \
+    && pacman -S --noconfirm openssh sudo jdk21-openjdk wget which procps-ng zsh git curlie micro ripgrep python3 exa \
     && rm -rf /var/cache/pacman/pkg/* \
     && mkdir -p /var/run/sshd \
     && chsh -s /bin/zsh root \
@@ -12,6 +12,11 @@ RUN sed -i 's/.*PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config \
     && sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/' /etc/ssh/sshd_config \
     && sed -i 's/UsePAM yes/UsePAM no/' /etc/ssh/sshd_config
 
+RUN echo "LC_ALL=en_US.UTF-8" >> /etc/environment \
+    && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
+    && echo "LANG=en_US.UTF-8" > /etc/locale.conf \
+    && locale-gen en_US.UTF-8
+
 RUN ssh-keygen -A && passwd -d root
 
 CMD ["/usr/sbin/sshd", "-D"]