diff --git a/shell.nix b/shell.nix
index df87abf..6851a66 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,6 +8,7 @@ pkgs.mkShell {
 
   buildInputs = [
     (pkgs.callPackage ./core {})
+    (pkgs.callPackage ./planner {})
     (pkgs.callPackage ./lang/go {})
     (pkgs.callPackage ./lang/rust {})
     (pkgs.callPackage ./docs/docread {})