VOL-3419: Update the tools image to use grpc c++ 1.31.1.
The latest grpc c++ version provides mechanisms to fine tune thread
pool settings in 'sync' mode of grpc API execution.
This version of grpc will be used to acheive some high performance
when agent takes up more task later to replicate the flows instead
of adapter doing it for the agent.
Change-Id: I90736d7b2d1d93554caa451fd5280451a7c9b6e8
diff --git a/Makefile b/Makefile
index 3f9866d..2d2cd67 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@
GTEST_VER ?= release-1.8.0
CMOCK_VER ?= 0207b30
GMOCK_GLOBAL_VER ?= 1.0.2
-GRPC_VER ?= v1.27.1
+GRPC_VER ?= v1.31.1
# Docker related
DOCKER_LABEL_VCS_DIRTY = false