diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index 98117c7ae41..c41bd5ff5aa 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -3,13 +3,13 @@
 }:
 
 stdenv.mkDerivation rec {
-  version = "1.33.2"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
+  version = "1.34.0"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
   pname = "grpc";
   src = fetchFromGitHub {
     owner = "grpc";
     repo = "grpc";
     rev = "v${version}";
-    sha256 = "0cc7yfa37ngrr0q9k3lm2yi4i57bfsyxwbblwc0f801k6wvgavcy";
+    sha256 = "0kipk26kg2x06mrkhb74k8vk5cn4mr89kw1f9mb04n616wkxjyxy";
     fetchSubmodules = true;
   };
   patches = [
diff --git a/pkgs/development/python-modules/grpcio-tools/default.nix b/pkgs/development/python-modules/grpcio-tools/default.nix
index a68eb704f6c..417b9d82e2e 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 = "1.33.2";
+  version = "1.34.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "af40774c0275f5465f49fd92bfcd9831b19b013de4cc77b8fb38aea76fa6dce3";
+    sha256 = "db5a6f0130256d534cbe35eab37d37a448d96f4fd736e5051c6be1aee49cea1d";
   };
 
   outputs = [ "out" "dev" ];