diff --git a/.forgejo/actions/nixos-docker/Dockerfile b/.forgejo/actions/nixos-docker/Dockerfile
index 7b62f331..928cc56c 100644
--- a/.forgejo/actions/nixos-docker/Dockerfile
+++ b/.forgejo/actions/nixos-docker/Dockerfile
@@ -1,2 +1,3 @@
-FROM nixos/nix 
+FROM nixos/nix
+ENV TZ="Asia/Tokyo"
 ENTRYPOINT [ "/root/.nix-profile/bin/sleep", "100000" ]
\ No newline at end of file