diff --git a/pkgs/development/python-modules/grpcio/default.nix b/pkgs/development/python-modules/grpcio/default.nix
index 3fe7dc751c86..c22f2c2f4d7b 100644
--- a/pkgs/development/python-modules/grpcio/default.nix
+++ b/pkgs/development/python-modules/grpcio/default.nix
@@ -3,11 +3,11 @@
 
 buildPythonPackage rec {
   pname = "grpcio";
-  version = "1.8.3";
+  version = "1.8.4";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "6ce5fd3093ddc09a152981d5c477ac645eda19dfcc819e45d8c57da6b743bd53";
+    sha256 = "88d87aab9c7889b3ab29dd74aac1a5493ed78b9bf5afba1c069c9dd5531f951d";
   };
 
   propagatedBuildInputs = [ six protobuf ]