diff --git a/shell.nix b/shell.nix
index cb6d227..081c8c2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,7 +2,7 @@
 with pkgs;
 mkShell {
   buildInputs = [ 
-    perl perlPackages.YAML perlPackages.TemplateToolkit
+    perl perlPackages.YAML perlPackages.TemplateToolkit perlPackages.RegexpGrammars
     lmdb zstd secp256k1 flatbuffers zlib openssl libuv
   ];
 }