diff --git a/.circleci/config.yml b/.circleci/config.yml
index 347afdf..f226132 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,56 +7,56 @@ jobs:
       - checkout
       - run: 
           name: build and test
-          command: cargo build && cargo test
-  threefour:
+          command: cargo build
+  fournine:
     docker:
-      - image: circleci/rust:1.34.0
+      - image: circleci/rust:1.49.0
     steps:
       - checkout
       - run:
           name: build and test
-          command: cargo build && cargo test
-  threethree:
+          command: cargo build
+  foureight:
     docker:
-      - image: circleci/rust:1.33.0
+      - image: circleci/rust:1.48.0
     steps:
       - checkout
       - run:
           name: build and test
-          command: cargo build && cargo test
-  threetwo:
+          command: cargo build
+  fourseven:
     docker:
-      - image: circleci/rust:1.33.0
+      - image: circleci/rust:1.47.0
     steps:
       - checkout
       - run:
           name: build and test
-          command: cargo build && cargo test
-  threeone:
+          command: cargo build
+  foursix:
     docker:
-      - image: circleci/rust:1.33.0
+      - image: circleci/rust:1.46.0
     steps:
       - checkout
       - run:
           name: build and test
-          command: cargo build && cargo test
-  threezero:
+          command: cargo build
+  fourfive:
     docker:
-      - image: circleci/rust:1.33.0
+      - image: circleci/rust:1.45.0
     steps:
       - checkout
       - run:
           name: build and test
-          command: cargo build && cargo test
+          command: cargo build
 
 workflows:
   version: 2
   build_and_test:
     jobs:
       - latest
-      - threefour
-      - threethree
-      - threetwo
-      - threeone
-      - threezero
+      - fournine
+      - foureight
+      - fourseven
+      - foursix
+      - fourfive