diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index 8549eeffde6..ab497eadb6d 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -1,25 +1,25 @@
 { stdenv, fetchFromGitHub, fetchpatch, cmake, zlib, c-ares, pkgconfig, openssl, protobuf, gflags, abseil-cpp }:
 
 stdenv.mkDerivation rec {
-  version = "1.28.1"; # N.B: if you change this, change pythonPackages.grpcio and pythonPackages.grpcio-tools to a matching version too
+  version = "1.29.0"; # 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 = "17p3xwz5izlqg5ijnim4asl40pr8yhg9wrrmws4g0dk37nkn1x6p";
+    sha256 = "1n604grkf2amzrmwcz6am0rpbp3yfb062lpgmhv943hj8wk7xw27";
     fetchSubmodules = true;
   };
   patches = [
     # Fix build on armv6l (https://github.com/grpc/grpc/pull/21341)
     (fetchpatch {
-      url = "https://github.com/grpc/grpc/commit/198d221e775cf73455eeb863672e7a6274d217f1.patch";
-      sha256 = "11k35w6ffvl192rgzzj2hzyzjhizdgk7i56zdkx6v60zxnyfn7yq";
+      url = "https://github.com/grpc/grpc/commit/2f4cf1d9265c8e10fb834f0794d0e4f3ec5ae10e.patch";
+      sha256 = "0ams3jmgh9yzwmxcg4ifb34znamr7pb4qm0609kvil9xqvkqz963";
     })
   ];
 
   nativeBuildInputs = [ cmake pkgconfig ];
-  buildInputs = [ zlib c-ares c-ares.cmake-config openssl protobuf gflags ];
+  buildInputs = [ zlib c-ares c-ares.cmake-config openssl protobuf gflags abseil-cpp ];
 
   cmakeFlags =
     [ "-DgRPC_ZLIB_PROVIDER=package"
@@ -27,6 +27,7 @@ stdenv.mkDerivation rec {
       "-DgRPC_SSL_PROVIDER=package"
       "-DgRPC_PROTOBUF_PROVIDER=package"
       "-DgRPC_GFLAGS_PROVIDER=package"
+      "-DgRPC_ABSL_PROVIDER=package"
       "-DBUILD_SHARED_LIBS=ON"
       "-DCMAKE_SKIP_BUILD_RPATH=OFF"
     ];
diff --git a/pkgs/development/python-modules/grpcio-tools/default.nix b/pkgs/development/python-modules/grpcio-tools/default.nix
index f3eb93cd060..4b28e07a6ce 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 = "1.28.1";
+  version = "1.29.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "adf089aaf6e21358b12e39d9fa7c28611340d8399a918c0b72ff122ce9b7e0af";
+    sha256 = "0f681c1ebd5472b804baa391b16dc59d92b065903999566f4776bfbd010bcec9";
   };
 
   enableParallelBuilding = true;