diff --git a/pkgs/applications/networking/instant-messengers/gajim/default.nix b/pkgs/applications/networking/instant-messengers/gajim/default.nix
index 035d8bad2616..67f294ea6a55 100644
--- a/pkgs/applications/networking/instant-messengers/gajim/default.nix
+++ b/pkgs/applications/networking/instant-messengers/gajim/default.nix
@@ -22,11 +22,11 @@
 
 python3.pkgs.buildPythonApplication rec {
   pname = "gajim";
-  version = "1.6.1";
+  version = "1.6.0";
 
   src = fetchurl {
     url = "https://gajim.org/downloads/${lib.versions.majorMinor version}/gajim-${version}.tar.gz";
-    hash = "sha256-3D87Ou/842WqbaUiJV1hRZFVkZzQ12GXCpRc8F3rKPQ=";
+    hash = "sha256-gHRB3thDH+CKRXTgrD37e2zf0rVDIVl4Zhxf5lsLjyc=";
   };
 
   buildInputs = [
@@ -61,8 +61,8 @@ python3.pkgs.buildPythonApplication rec {
   checkPhase = ''
     xvfb-run dbus-run-session \
       --config-file=${dbus}/share/dbus-1/session.conf \
-      ${python3.interpreter} -m unittest discover -s test/gui -v
-    ${python3.interpreter} -m unittest discover -s test/common -v
+      ${python3.interpreter} -m unittest discover -s test/gtk -v
+    ${python3.interpreter} -m unittest discover -s test/no_gui -v
   '';
 
   # necessary for wrapGAppsHook
diff --git a/pkgs/development/python-modules/nbxmpp/default.nix b/pkgs/development/python-modules/nbxmpp/default.nix
index 3c09458e874c..1ce72428c10c 100644
--- a/pkgs/development/python-modules/nbxmpp/default.nix
+++ b/pkgs/development/python-modules/nbxmpp/default.nix
@@ -13,7 +13,7 @@
 
 buildPythonPackage rec {
   pname = "nbxmpp";
-  version = "4.0.1";
+  version = "4.0.0";
 
   disabled = pythonOlder "3.10";
 
@@ -22,7 +22,7 @@ buildPythonPackage rec {
     owner = "gajim";
     repo = "python-nbxmpp";
     rev = version;
-    hash = "sha256-PL+qNxeNubGSLqSci4uhRWtOIqs10p+A1VPfTwCLu84=";
+    hash = "sha256-6PYJGlNOZMwHMXwf05IWekJ+haMfg+ooH5On+aYOWSI=";
   };
 
   nativeBuildInputs = [