diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index e4230093e9c..94422518b25 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -1,4 +1,4 @@
-{ pkgs, lib }:
+{ pkgs }:
 
 with pkgs;
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c111685ca01..570e27b45ea 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -10217,10 +10217,10 @@ in
 
   pythonInterpreters = callPackage ./../development/interpreters/python {
     # Overrides that apply to all Python interpreters
-    pkgs = pkgs // {
-      qt5 = pkgs.qt514;
-      libsForQt5 = pkgs.libsForQt514;
-    };
+    pkgs = pkgs.extend (final: _: {
+      qt5 = final.qt514;
+      libsForQt5 = final.libsForQt514;
+    });
   };
   inherit (pythonInterpreters) python27 python36 python37 python38 python39 python3Minimal pypy27 pypy36;
 
@@ -22956,19 +22956,14 @@ in
   quodlibet-xine-full = quodlibet-full.override { xineBackend = true; tag = "-xine-full"; };
 
   qutebrowser = let
-    libsForQt5 = libsForQt515;
-    qt5 = qt515;
-    python = python3.override {
-      packageOverrides = self: super: {
-        pkgs = pkgs // {
-          inherit libsForQt5 qt5;
-        };
-      };
-      self = python3;
-    };
-  in libsForQt5.callPackage ../applications/networking/browsers/qutebrowser {
-    python3 = python;
-  };
+    pkgs_ = pkgs.extend(_: prev: {
+      pythonInterpreters = prev.pythonInterpreters.override(oldAttrs: {
+        pkgs = oldAttrs.pkgs.extend(_: _: {
+          inherit (pkgs) qt5 libsForQt5;
+        });
+      });
+    });
+  in pkgs_.libsForQt5.callPackage ../applications/networking/browsers/qutebrowser { };
 
   rabbitvcs = callPackage ../applications/version-management/rabbitvcs {};