diff --git a/pkgs/by-name/po/poezio/package.nix b/pkgs/by-name/po/poezio/package.nix
index 78a64d62ee49..834cd4ea8701 100644
--- a/pkgs/by-name/po/poezio/package.nix
+++ b/pkgs/by-name/po/poezio/package.nix
@@ -8,14 +8,14 @@
 
 python3.pkgs.buildPythonApplication (finalAttrs: {
   pname = "poezio";
-  version = "0.16";
+  version = "0.18";
   pyproject = true;
 
   src = fetchFromCodeberg {
     owner = "poezio";
     repo = "poezio";
     rev = "v${finalAttrs.version}";
-    hash = "sha256-bpudgf9oZ+7w7izAuWYKFVO9CIHraHaGvRKLDuSIF7c=";
+    hash = "sha256-/QGxJrWK8Sl+t8SBsU8ZAMU/5pR+daf7Q43jczzENmw=";
   };
 
   nativeBuildInputs = [ pkg-config ];
diff --git a/pkgs/development/python-modules/slixmpp/default.nix b/pkgs/development/python-modules/slixmpp/default.nix
index f27793fb8349..6bf6b5f3e624 100644
--- a/pkgs/development/python-modules/slixmpp/default.nix
+++ b/pkgs/development/python-modules/slixmpp/default.nix
@@ -20,16 +20,16 @@
   setuptools-scm,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "slixmpp";
-  version = "1.13.2";
+  version = "1.16.0";
   pyproject = true;
 
   src = fetchFromCodeberg {
     owner = "poezio";
     repo = "slixmpp";
-    tag = "slix-${version}";
-    hash = "sha256-hjM1OIFYpHV5SSN32858pyuwOvaAA0tFZWCZI+5n9u4=";
+    tag = "slix-${finalAttrs.version}";
+    hash = "sha256-d0laQWaqZUoviF7NM/egENQ3ArQE12ER0TzfPBcnc7Q=";
   };
 
   patches = [
@@ -71,7 +71,10 @@ buildPythonPackage rec {
     safer-xml-parsing = [ defusedxml ];
   };
 
-  nativeCheckInputs = [ pytestCheckHook ] ++ lib.concatAttrValues optional-dependencies;
+  nativeCheckInputs = [
+    pytestCheckHook
+  ]
+  ++ lib.concatAttrValues finalAttrs.passthru.optional-dependencies;
 
   preCheck = ''
     # don't test against pure python version in the source tree
@@ -90,8 +93,8 @@ buildPythonPackage rec {
   meta = {
     description = "Python library for XMPP";
     homepage = "https://slixmpp.readthedocs.io/";
-    changelog = "https://codeberg.org/poezio/slixmpp/releases/tag/${src.tag}";
+    changelog = "https://codeberg.org/poezio/slixmpp/releases/tag/${finalAttrs.src.tag}";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})