diff --git a/makefu/2configs/tools/dev.nix b/makefu/2configs/tools/dev.nix
index d3d50c433..46872279a 100644
--- a/makefu/2configs/tools/dev.nix
+++ b/makefu/2configs/tools/dev.nix
@@ -2,7 +2,8 @@
 
 {
   users.users.makefu.packages = with pkgs;[
-    python35Packages.virtualenv
+    python3Packages.virtualenv
+    python3Packages.pyserial
     # embedded
     gi
     flashrom