diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index 81e90154aa5..78335e073ed 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -1,13 +1,13 @@
 { stdenv, fetchFromGitHub, cmake, zlib, c-ares, pkgconfig, openssl, protobuf, gflags }:
 
 stdenv.mkDerivation rec {
-  version = "1.22.0";
+  version = "1.23.0"; # N.B: if you change this, change pythonPackages.grpcio and pythonPackages.grpcio-tools to a matching version too
   name = "grpc-${version}";
   src = fetchFromGitHub {
     owner = "grpc";
     repo = "grpc";
     rev = "v${version}";
-    sha256 = "10wf9sakkxpcvc09n1h91x6slwwhxblghs4zn95klyc4m6py1gfg";
+    sha256 = "14svfy7lvz8lf6b7zg1fbypj2n46n9gq0ldgnv85jm0ikv72cgv6";
   };
   nativeBuildInputs = [ cmake pkgconfig ];
   buildInputs = [ zlib c-ares c-ares.cmake-config openssl protobuf gflags ];
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)";
     license = licenses.asl20;
-    maintainers = [ maintainers.lnl7 ];
+    maintainers = [ maintainers.lnl7 maintainers.marsam ];
     homepage = https://grpc.io/;
   };
 }
diff --git a/pkgs/development/python-modules/grpcio-tools/default.nix b/pkgs/development/python-modules/grpcio-tools/default.nix
index 9355db763dc..cb6e47a6002 100644
--- a/pkgs/development/python-modules/grpcio-tools/default.nix
+++ b/pkgs/development/python-modules/grpcio-tools/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "grpcio-tools";
-  version = "1.22.0";
+  version = "1.23.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "b5c0fe51a155625c9d1132ab8deb56b3015e111a6961e48aeb9dd89bd7c670ab";
+    sha256 = "cbc35031ec2b29af36947d085a7fbbcd8b79b84d563adf6156103d82565f78db";
   };
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/python-modules/grpcio/default.nix b/pkgs/development/python-modules/grpcio/default.nix
index 5c85dd34357..65e9e3fb599 100644
--- a/pkgs/development/python-modules/grpcio/default.nix
+++ b/pkgs/development/python-modules/grpcio/default.nix
@@ -4,14 +4,14 @@
 
 buildPythonPackage rec {
   pname = "grpcio";
-  version = "1.22.0";
+  version = "1.23.0";
 
   src = fetchFromGitHub {
     owner = "grpc";
     repo = "grpc";
     rev = "v${version}";
     fetchSubmodules = true;
-    sha256 = "093w8mgvl8ylqlqnfz06ijkmlnkxcjszf9zg6k5ybjw7dwal0jhz";
+    sha256 = "18hf794frncqvq3n4j5n8kip0gp6ch4pf5b3n6809q0c1paf6rp5";
   };
 
   nativeBuildInputs = [ cython pkgconfig ]