diff --git a/.circleci/config.yml b/.circleci/config.yml
index a544a44..1c01287 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,14 +9,13 @@ jobs:
       - checkout
       - restore_cache:
           keys:
-            - v3-dependencies-{{ checksum "package.json" }}
-      - run: yarn install
-      - run: yarn add codecov
+            - v4-dependencies-{{ checksum "package.json" }}
+      - run: npm install
       - save_cache:
           paths:
             - node_modules
-          key: v3-dependencies-{{ checksum "package.json" }}
-      - run: yarn test
+          key: v4-dependencies-{{ checksum "package.json" }}
+      - run: npm test
       - run:
           name: upload coverage reports
           command: ./node_modules/.bin/codecov
diff --git a/package-lock.json b/package-lock.json
index bef1530..4f56f42 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -121,6 +121,12 @@
         "sprintf-js": "1.0.3"
       }
     },
+    "argv": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
+      "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
+      "dev": true
+    },
     "arr-diff": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
@@ -540,6 +546,17 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "codecov": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/codecov/-/codecov-2.3.0.tgz",
+      "integrity": "sha1-rSWixuBELRN0DZ1N27mj4nFDMPQ=",
+      "dev": true,
+      "requires": {
+        "argv": "0.0.2",
+        "request": "2.81.0",
+        "urlgrey": "0.4.4"
+      }
+    },
     "color-convert": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.0.tgz",
@@ -4475,6 +4492,12 @@
       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
       "dev": true
     },
+    "urlgrey": {
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
+      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
+      "dev": true
+    },
     "useragent": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.2.1.tgz",
diff --git a/package.json b/package.json
index d947489..e0d98bd 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "jquery": ">=1.8.3"
   },
   "devDependencies": {
+    "codecov": "^2.3.0",
     "eslint": "4.8.0",
     "jasmine-ajax": "3.3.1",
     "jasmine-core": "2.8.0",