diff --git a/modules/_overlays/pi-harness.nix b/modules/_overlays/pi-harness.nix
index 133b8d3..4a211a6 100644
--- a/modules/_overlays/pi-harness.nix
+++ b/modules/_overlays/pi-harness.nix
@@ -12,7 +12,7 @@
 					src = inputs.pi-harness;
 					pnpm = prev.pnpm_10;
 					fetcherVersion = 1;
-					hash = "sha256-FgtJnmJ0/udz2A9N2DQns+a2CspMDEDk0DPUAxmCVY4=";
+					hash = "sha256-jn3Ra1voc3KHabHAMqqCJirGcws80n9Md4M3fo0YgKk=";
 				};
 
 			nativeBuildInputs = [
diff --git a/modules/overlays.nix b/modules/overlays.nix
index ac9e63a..22c555d 100644
--- a/modules/overlays.nix
+++ b/modules/overlays.nix
@@ -2,17 +2,18 @@
 	overlays = [
 		# himalaya
 		(import ./_overlays/himalaya.nix {inherit inputs;})
-		# direnv (darwin upstream makefile forces external linking)
-		(final: prev: {
-				direnv =
-					prev.direnv.overrideAttrs (old: {
-							env =
-								(old.env or {})
-								// final.lib.optionalAttrs final.stdenv.isDarwin {
-									CGO_ENABLED = 1;
-								};
-						});
-			})
+		# direnv (Go 1.26 on darwin disables cgo, but direnv forces external linking)
+		(final: prev:
+				prev.lib.optionalAttrs prev.stdenv.hostPlatform.isDarwin {
+					direnv =
+						prev.direnv.overrideAttrs (old: {
+								env =
+									(old.env or {})
+									// {
+										CGO_ENABLED = 1;
+									};
+							});
+				})
 		# ast-grep (test_scan_invalid_rule_id fails on darwin in sandbox)
 		(import ./_overlays/ast-grep.nix {inherit inputs;})
 		# jj-ryu