diff --git a/flake.nix b/flake.nix
index be1087c..921ffc6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -114,6 +114,7 @@
               pkgs.git
               pkgs.cmark
               pkgs.tree-sitter
+              pkgs.tzdata
               html-grammar
               css-grammar
             ];