diff --git a/shell.nix b/shell.nix
index 54d9f38..2ef0b23 100644
--- a/shell.nix
+++ b/shell.nix
@@ -7,6 +7,7 @@ stdenv.mkDerivation rec {
     elmPackages.elm
     elmPackages.elm-analyse
     elmPackages.elm-format
+    elmPackages.elm-json
     elmPackages.elm-language-server
     elmPackages.elm-test
     go