diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index 00d3c4a5637e..2bf843241a6a 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -3,13 +3,13 @@
 }:
 
 stdenv.mkDerivation rec {
-  version = "1.38.1"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
+  version = "1.39.0"; # 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 = "0hjp946x5695srmc6bg2m7iih81jdmhpxn4bjcl80f09v4qsb0nl";
+    sha256 = "1wa7n7mf20fnvxqw093kr7a4c7vilcmx9yl3hicnyfcd663jgqvd";
     fetchSubmodules = true;
   };
   patches = [
diff --git a/pkgs/development/python-modules/grpcio-tools/default.nix b/pkgs/development/python-modules/grpcio-tools/default.nix
index 7236f7c22e3d..0e095126676d 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 = "1.38.1";
+  version = "1.39.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "cd85f58038b92e1961f8127d79691e84e151390d35cae73c4c0cbe2042f76b77";
+    sha256 = "39dfe7415bc0d3860fdb8dd90607594b046b88b57dbe64284efa4820f951c805";
   };
 
   outputs = [ "out" "dev" ];