diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index f015773e2041..72c584d0fd47 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -17,13 +17,13 @@
 
 stdenv.mkDerivation rec {
   pname = "grpc";
-  version = "1.39.1"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
+  version = "1.40.0"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
 
   src = fetchFromGitHub {
     owner = "grpc";
     repo = "grpc";
     rev = "v${version}";
-    sha256 = "1yrr04g6faphh4hwzryqrwzgcr0hqqh05x9mc3vhpzmdkrrbz4zn";
+    sha256 = "08l2dyf3g3zrffy60ycid6jngvhfaghg792yrkfjcpcif5dqfd9f";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/development/python-modules/grpcio-tools/default.nix b/pkgs/development/python-modules/grpcio-tools/default.nix
index 0e095126676d..eb27a5596bc2 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 = "1.39.0";
+  version = "1.40.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "39dfe7415bc0d3860fdb8dd90607594b046b88b57dbe64284efa4820f951c805";
+    sha256 = "d440f2bc089ff628618c536904d5bc39d0b44f7afdda4c4c1ecd15fcf385bfba";
   };
 
   outputs = [ "out" "dev" ];