diff --git a/.circleci/config.yml b/.circleci/config.yml
index d8c7abf16..4fdb3e38f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -400,7 +400,8 @@ workflows:
   version: 2.1
   ci:
     jobs:
-      - lint-all
+      - lint-all:
+          concurrency: "16"   # expend all docker 2xlarge CPUs.
       - mod-tidy-check
       - gofmt
       - cbor-gen-check