diff --git a/shell.nix b/shell.nix
index 1bc220f53c9c19223104132caa08272a7383c0b3..d23d71f2a08f548f9fd95c6a95490f2de7f8b60a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -22,6 +22,7 @@ pkgs.mkShell {
   inputsFrom = [tools];
   buildInputs = [
     tools
+    pkgs.cacert
     pkgs.nix
     pkgs.morph
     pkgs.jp