diff --git a/.circleci/config.yml b/.circleci/config.yml
index c3a1d605..21c8ca46 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -34,7 +34,7 @@ jobs:
   test:
     docker:
       - image: zokrates/env:latest
-    resource_class: 2xlarge
+    resource_class: xlarge
     steps:
       - checkout
       - run:
@@ -48,7 +48,7 @@ jobs:
           command: cargo fmt --all -- --check
       - run:
           name: Run clippy
-          command: cargo clippy -- -D warnings
+          command: cargo clippy -j 1 -- -D warnings
       - run:
           name: Run tests
           command: WITH_LIBSNARK=1 RUSTFLAGS="-D warnings" ./test.sh