diff --git a/ports/grpc/00001-fix-uwp.patch b/ports/grpc/00001-fix-uwp.patch
index 1811fdf92d948a..6f7f2d90fff808 100644
--- a/ports/grpc/00001-fix-uwp.patch
+++ b/ports/grpc/00001-fix-uwp.patch
@@ -1,148 +1,148 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index e1013dc561..b02d07ccba 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -90,6 +90,9 @@ if(UNIX)
- endif()
- if(WIN32)
-   set(_gRPC_PLATFORM_WINDOWS ON)
-+  if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
-+    set(_gRPC_PLATFORM_UWP ON)
-+  endif()
- endif()
- 
- set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
-@@ -107,6 +110,9 @@ if (MSVC)
-   add_definitions(/wd4267)
-   # TODO(jtattermusch): needed to build boringssl with VS2017, revisit later
-   add_definitions(/wd4987 /wd4774 /wd4819 /wd4996 /wd4619)
-+  if(_gRPC_PLATFORM_UWP)
-+    add_definitions(-DGRPC_ARES=0)
-+  endif()
- endif()
- 
- if (gRPC_USE_PROTO_LITE)
-@@ -177,6 +183,10 @@ file(MAKE_DIRECTORY ${_gRPC_PROTO_GENS_DIR})
- #     ``.proto`` files
- #
- function(protobuf_generate_grpc_cpp)
-+  if(_gRPC_PLATFORM_UWP)
-+    return()
-+  endif()
-+
-   if(NOT ARGN)
-     message(SEND_ERROR "Error: PROTOBUF_GENERATE_GRPC_CPP() called without any proto files")
-     return()
-@@ -211,6 +221,7 @@ function(protobuf_generate_grpc_cpp)
-   endforeach()
- endfunction()
- 
-+if(NOT _gRPC_PLATFORM_UWP)
- add_custom_target(plugins
-   DEPENDS
-   grpc_cpp_plugin
-@@ -240,6 +251,8 @@ add_custom_target(tools_cxx
- add_custom_target(tools
-   DEPENDS tools_c tools_cxx)
- 
-+endif()
-+
- if (gRPC_BUILD_TESTS)
- add_custom_target(buildtests_c)
- add_dependencies(buildtests_c algorithm_test)
-@@ -3795,7 +3808,6 @@ foreach(_hdr
-     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
-   )
- endforeach()
--endif (gRPC_BUILD_CODEGEN)
- 
- 
- if (gRPC_INSTALL)
-@@ -3805,6 +3817,7 @@ if (gRPC_INSTALL)
-     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
-   )
- endif()
-+endif (gRPC_BUILD_CODEGEN)
- 
- if (gRPC_BUILD_TESTS)
- 
-@@ -3925,7 +3938,7 @@ foreach(_hdr
-     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
-   )
- endforeach()
--endif (gRPC_BUILD_CODEGEN)
-+
- 
- 
- if (gRPC_INSTALL)
-@@ -3935,6 +3948,7 @@ if (gRPC_INSTALL)
-     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
-   )
- endif()
-+endif (gRPC_BUILD_CODEGEN)
- 
- if (gRPC_BUILD_TESTS)
- 
-@@ -4926,7 +4940,6 @@ foreach(_hdr
-     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
-   )
- endforeach()
--endif (gRPC_BUILD_CODEGEN)
- 
- 
- if (gRPC_INSTALL)
-@@ -4936,6 +4949,7 @@ if (gRPC_INSTALL)
-     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
-   )
- endif()
-+endif (gRPC_BUILD_CODEGEN)
- 
- if (gRPC_BUILD_TESTS)
- 
-diff --git a/src/core/lib/iomgr/resource_quota.cc b/src/core/lib/iomgr/resource_quota.cc
-index 61c366098e..aac2ce0a9f 100644
---- a/src/core/lib/iomgr/resource_quota.cc
-+++ b/src/core/lib/iomgr/resource_quota.cc
-@@ -937,7 +937,7 @@ void grpc_resource_user_alloc(grpc_resource_user* resource_user, size_t size,
- void grpc_resource_user_free(grpc_resource_user* resource_user, size_t size) {
-   gpr_mu_lock(&resource_user->mu);
-   grpc_resource_quota* resource_quota = resource_user->resource_quota;
--  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -size);
-+  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -static_cast<gpr_atm>(size));
-   GPR_ASSERT(prior >= static_cast<long>(size));
-   bool was_zero_or_negative = resource_user->free_pool <= 0;
-   resource_user->free_pool += static_cast<int64_t>(size);
-diff --git a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
-index 55efe0e..f538f26 100644
---- a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
-+++ b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
-@@ -60,6 +60,8 @@ bool check_bios_data(const char* bios_data_file) {
- 
- static void init_mu(void) { gpr_mu_init(&g_mu); }
- 
-+#if !defined(WINAPI_FAMILY) || WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP
-+
- static bool run_powershell() {
-   SECURITY_ATTRIBUTES sa;
-   sa.nLength = sizeof(sa);
-@@ -97,8 +99,12 @@ static bool run_powershell() {
-   CloseHandle(h);
-   return true;
- }
-+#endif
- 
- bool grpc_alts_is_running_on_gcp() {
-+#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP)
-+  g_is_on_compute_engine = false;
-+#else
-   gpr_once_init(&g_once, init_mu);
-   gpr_mu_lock(&g_mu);
-   if (!g_compute_engine_detection_done) {
-@@ -108,6 +114,7 @@ bool grpc_alts_is_running_on_gcp() {
-     g_compute_engine_detection_done = true;
-   }
-   gpr_mu_unlock(&g_mu);
-+#endif
-   return g_is_on_compute_engine;
- }
- 
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8ba68c4a13..258a1609f6 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -90,6 +90,9 @@ if(UNIX)
+ endif()
+ if(WIN32)
+   set(_gRPC_PLATFORM_WINDOWS ON)
++  if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
++    set(_gRPC_PLATFORM_UWP ON)
++  endif()
+ endif()
+ 
+ set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
+@@ -107,6 +110,9 @@ if (MSVC)
+   add_definitions(/wd4267)
+   # TODO(jtattermusch): needed to build boringssl with VS2017, revisit later
+   add_definitions(/wd4987 /wd4774 /wd4819 /wd4996 /wd4619)
++  if(_gRPC_PLATFORM_UWP)
++    add_definitions(-DGRPC_ARES=0)
++  endif()
+ endif()
+ 
+ if (gRPC_USE_PROTO_LITE)
+@@ -177,6 +183,10 @@ file(MAKE_DIRECTORY ${_gRPC_PROTO_GENS_DIR})
+ #     ``.proto`` files
+ #
+ function(protobuf_generate_grpc_cpp)
++  if(_gRPC_PLATFORM_UWP)
++    return()
++  endif()
++
+   if(NOT ARGN)
+     message(SEND_ERROR "Error: PROTOBUF_GENERATE_GRPC_CPP() called without any proto files")
+     return()
+@@ -218,6 +228,7 @@ function(protobuf_generate_grpc_cpp)
+   endforeach()
+ endfunction()
+ 
++if(NOT _gRPC_PLATFORM_UWP)
+ add_custom_target(plugins
+   DEPENDS
+   grpc_cpp_plugin
+@@ -247,6 +258,8 @@ add_custom_target(tools_cxx
+ add_custom_target(tools
+   DEPENDS tools_c tools_cxx)
+ 
++endif()
++
+ if (gRPC_BUILD_TESTS)
+ add_custom_target(buildtests_c)
+ add_dependencies(buildtests_c algorithm_test)
+@@ -4029,7 +4042,6 @@ foreach(_hdr
+     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
+   )
+ endforeach()
+-endif (gRPC_BUILD_CODEGEN)
+ 
+ if (gRPC_BUILD_CODEGEN)
+ 
+@@ -4040,6 +4052,7 @@ if (gRPC_INSTALL)
+     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
+   )
+ endif()
++endif (gRPC_BUILD_CODEGEN)
+ 
+ endif (gRPC_BUILD_CODEGEN)
+ if (gRPC_BUILD_TESTS)
+@@ -4163,7 +4176,7 @@ foreach(_hdr
+     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
+   )
+ endforeach()
+-endif (gRPC_BUILD_CODEGEN)
++
+ 
+ if (gRPC_BUILD_CODEGEN)
+ 
+@@ -4174,6 +4187,7 @@ if (gRPC_INSTALL)
+     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
+   )
+ endif()
++endif (gRPC_BUILD_CODEGEN)
+ 
+ endif (gRPC_BUILD_CODEGEN)
+ if (gRPC_BUILD_TESTS)
+@@ -5196,7 +5210,6 @@ foreach(_hdr
+     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
+   )
+ endforeach()
+-endif (gRPC_BUILD_CODEGEN)
+ 
+ if (gRPC_BUILD_CODEGEN)
+ 
+@@ -5207,6 +5220,7 @@ if (gRPC_INSTALL)
+     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
+   )
+ endif()
++endif (gRPC_BUILD_CODEGEN)
+ 
+ endif (gRPC_BUILD_CODEGEN)
+ if (gRPC_BUILD_TESTS)
+diff --git a/src/core/lib/iomgr/resource_quota.cc b/src/core/lib/iomgr/resource_quota.cc
+index dffac348c5..a59becb046 100644
+--- a/src/core/lib/iomgr/resource_quota.cc
++++ b/src/core/lib/iomgr/resource_quota.cc
+@@ -940,7 +940,7 @@ void grpc_resource_user_alloc(grpc_resource_user* resource_user, size_t size,
+ void grpc_resource_user_free(grpc_resource_user* resource_user, size_t size) {
+   gpr_mu_lock(&resource_user->mu);
+   grpc_resource_quota* resource_quota = resource_user->resource_quota;
+-  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -size);
++  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -static_cast<gpr_atm>(size));
+   GPR_ASSERT(prior >= static_cast<long>(size));
+   bool was_zero_or_negative = resource_user->free_pool <= 0;
+   resource_user->free_pool += static_cast<int64_t>(size);
+diff --git a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
+index 55efe0e9dd..f538f26edf 100644
+--- a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
++++ b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
+@@ -60,6 +60,8 @@ bool check_bios_data(const char* bios_data_file) {
+ 
+ static void init_mu(void) { gpr_mu_init(&g_mu); }
+ 
++#if !defined(WINAPI_FAMILY) || WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP
++
+ static bool run_powershell() {
+   SECURITY_ATTRIBUTES sa;
+   sa.nLength = sizeof(sa);
+@@ -97,8 +99,12 @@ static bool run_powershell() {
+   CloseHandle(h);
+   return true;
+ }
++#endif
+ 
+ bool grpc_alts_is_running_on_gcp() {
++#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP)
++  g_is_on_compute_engine = false;
++#else
+   gpr_once_init(&g_once, init_mu);
+   gpr_mu_lock(&g_mu);
+   if (!g_compute_engine_detection_done) {
+@@ -108,6 +114,7 @@ bool grpc_alts_is_running_on_gcp() {
+     g_compute_engine_detection_done = true;
+   }
+   gpr_mu_unlock(&g_mu);
++#endif
+   return g_is_on_compute_engine;
+ }
+ 
diff --git a/ports/grpc/00002-static-linking-in-linux.patch b/ports/grpc/00002-static-linking-in-linux.patch
index 4c004d16bd1374..e8005edaa815cf 100644
--- a/ports/grpc/00002-static-linking-in-linux.patch
+++ b/ports/grpc/00002-static-linking-in-linux.patch
@@ -6,7 +6,7 @@ index 3839e22..91720a9 100644
  
  add_definitions(-DPB_FIELD_32BIT)
  
-+if (gRPC_STATIC_LINKING)
++if (gRPC_STATIC_LINKING AND NOT _gRPC_PLATFORM_WINDOWS)
 +  # Force to static link
 +  set(CMAKE_EXE_LINKER_FLAGS "-Bstatic")
 +endif()
diff --git a/ports/grpc/00003-undef-base64-macro.patch b/ports/grpc/00003-undef-base64-macro.patch
new file mode 100644
index 00000000000000..8417e3eea30678
--- /dev/null
+++ b/ports/grpc/00003-undef-base64-macro.patch
@@ -0,0 +1,13 @@
+diff --git a/src/core/lib/transport/transport.cc b/src/core/lib/transport/transport.cc
+index 09306110c6..eb0ad96a7a 100644
+--- a/src/core/lib/transport/transport.cc
++++ b/src/core/lib/transport/transport.cc
+@@ -134,6 +134,8 @@ void grpc_stream_ref_init(grpc_stream_refcount* refcount, int initial_refs,
+   refcount->slice_refcount.sub_refcount = &refcount->slice_refcount;
+ }
+ 
++#undef move64
++
+ static void move64(uint64_t* from, uint64_t* to) {
+   *to += *from;
+   *from = 0;
diff --git a/ports/grpc/00004-link-gdi32-on-windows.patch b/ports/grpc/00004-link-gdi32-on-windows.patch
new file mode 100644
index 00000000000000..8aede465634143
--- /dev/null
+++ b/ports/grpc/00004-link-gdi32-on-windows.patch
@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e820737201..3eb4795660 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -158,7 +158,7 @@ elseif(UNIX)
+ endif()
+ 
+ if(WIN32 AND MSVC)
+-  set(_gRPC_BASELIB_LIBRARIES wsock32 ws2_32)
++  set(_gRPC_BASELIB_LIBRARIES wsock32 ws2_32 gdi32)
+ endif()
+ 
+ # Create directory for generated .proto files
diff --git a/ports/grpc/CONTROL b/ports/grpc/CONTROL
index 025227d09fc475..1854600e312ec5 100644
--- a/ports/grpc/CONTROL
+++ b/ports/grpc/CONTROL
@@ -1,4 +1,4 @@
 Source: grpc
-Version: 1.19.1-1
+Version: 1.20.1
 Build-Depends: zlib, openssl, protobuf, c-ares (!uwp)
 Description: An RPC library and framework
diff --git a/ports/grpc/portfile.cmake b/ports/grpc/portfile.cmake
index 0547d88eb69a3b..fc0299b8d5f95a 100644
--- a/ports/grpc/portfile.cmake
+++ b/ports/grpc/portfile.cmake
@@ -11,15 +11,17 @@ endif()
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO grpc/grpc
-    REF v1.19.1
-    SHA512 4bb127d946fc16887fd4cf75215f0bc9f6d17dbd36fc4f1b191a64914f96c49dddb41f1b6c72fd24ea0a40f242b4398248f32fcb1fe9a764367be1c2edda9142
+    REF v1.20.1
+    SHA512 e0dd0318d2b4ec07e0eafffa218938d91b1440c5053a557460ea7fceaab3d76f0cccc1d595abe7de9fa79f068b71cfbc5a28a3b688bc9c1e2737086928149583
     HEAD_REF master
     PATCHES 
         00001-fix-uwp.patch
         00002-static-linking-in-linux.patch
+        00003-undef-base64-macro.patch
+        00004-link-gdi32-on-windows.patch
 )
 
-if(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+if(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "WindowsStore" OR VCPKG_TARGET_ARCHITECTURE STREQUAL "arm" OR VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64")
     set(gRPC_BUILD_CODEGEN OFF)
 else()
     set(gRPC_BUILD_CODEGEN ON)