diff --git a/shell.nix b/shell.nix
index d3917b106..ea01f7b35 100644
--- a/shell.nix
+++ b/shell.nix
@@ -13,6 +13,7 @@ pkgs.mkShell {
 
     pkgs.python311Packages.secp256k1
     pkgs.python311Packages.fastecdsa
+    pkgs.python311Packages.greenlet
   ];
 
   shellHook = ''