diff --git a/pkgs/development/python-modules/mitmproxy/default.nix b/pkgs/development/python-modules/mitmproxy/default.nix
index 6248d2e0d47e..2e7c2bf7848b 100644
--- a/pkgs/development/python-modules/mitmproxy/default.nix
+++ b/pkgs/development/python-modules/mitmproxy/default.nix
@@ -60,6 +60,8 @@ buildPythonPackage rec {
   pythonRelaxDeps = [
     "passlib"
     "protobuf"
+    "pyparsing"
+    "ruamel.yaml"
     "urwid"
   ];