diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3c4970bba29..468b6128524 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -476,7 +476,7 @@ executors:
   release_exec:
     docker:
       - image: ghcr.io/ros-planning/navigation2:main
-    resource_class: large
+    resource_class: medium
     working_directory: /opt/overlay_ws
     environment:
       <<: *common_environment
diff --git a/.circleci/defaults.yaml b/.circleci/defaults.yaml
index e1d62a04d27..e0d946f78ee 100644
--- a/.circleci/defaults.yaml
+++ b/.circleci/defaults.yaml
@@ -6,7 +6,7 @@ _common: &common
 "build":
   <<: *common
   "executor": "parallel"
-  "parallel-workers": 4
+  "parallel-workers": 2
   "symlink-install": true
 "test":
   <<: *common