diff --git a/pkgs/development/python-modules/mitmproxy/default.nix b/pkgs/development/python-modules/mitmproxy/default.nix
index b50216ece8ad..2c4d1da6e629 100644
--- a/pkgs/development/python-modules/mitmproxy/default.nix
+++ b/pkgs/development/python-modules/mitmproxy/default.nix
@@ -59,6 +59,7 @@ buildPythonPackage rec {
 
 
   pythonRelaxDeps = [
+    "protobuf"
     "urwid"
   ];
 
diff --git a/pkgs/development/python-modules/protobuf/default.nix b/pkgs/development/python-modules/protobuf/default.nix
index 75dc81ccbad3..049833dc1b09 100644
--- a/pkgs/development/python-modules/protobuf/default.nix
+++ b/pkgs/development/python-modules/protobuf/default.nix
@@ -7,12 +7,12 @@
 
 buildPythonPackage rec {
   pname = "protobuf";
-  version = "5.27.2";
+  version = "5.28.0";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-8+ze8ia5r4VgdfKCJ/8skM46WU0JLDm+5VE1c/JeJxQ=";
+    hash = "sha256-3edK8Pp3T6mIkiCZkila2/uR2j+pjI9nqIr+j1o0mt0=";
   };
 
   build-system = [ setuptools ];