diff --git a/circle.yml b/circle.yml
index 2e46f661..ce1640bc 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,11 +1,10 @@
 machine:
   node:
-    version: 0.12.0
+    version: 6.11.3
   hosts:
     testripple.circleci.com: 127.0.0.1
 dependencies:
   pre:
-    - npm -g install npm@latest-2
     - wget https://s3-us-west-2.amazonaws.com/ripple-debs/rippled_0.30.1-b11-1.deb
     - sudo dpkg -i rippled_0.30.1-b11-1.deb
 test:
diff --git a/package.json b/package.json
index f4f85c89..1f10dc91 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "babel-preset-es2015": "^6.3.13",
     "babel-preset-stage-1": "^6.3.13",
     "babel-register": "^6.3.13",
-    "coveralls": "^2.11.9",
+    "coveralls": "^2.13.1",
     "doctoc": "^0.15.0",
     "ejs": "^2.3.4",
     "eslint": "^2.9.0",
diff --git a/scripts/ci.sh b/scripts/ci.sh
index 549ef11b..13ac20b1 100755
--- a/scripts/ci.sh
+++ b/scripts/ci.sh
@@ -29,7 +29,7 @@ unittest() {
   npm run coveralls
 
   # test compiled version in "dist/npm"
-  babel -D --optional runtime --ignore "**/node_modules/**" -d test-compiled/ test/
+  $(npm bin)/babel -D --optional runtime --ignore "**/node_modules/**" -d test-compiled/ test/
   echo "--reporter spec --timeout 5000 --slow 500" > test-compiled/mocha.opts
   mkdir -p test-compiled/node_modules
   ln -nfs ../../dist/npm test-compiled/node_modules/ripple-api
diff --git a/src/transaction/utils.js b/src/transaction/utils.js
index f12b8905..679ecacd 100644
--- a/src/transaction/utils.js
+++ b/src/transaction/utils.js
@@ -27,7 +27,7 @@ function setCanonicalFlag(txJSON) {
   txJSON.Flags = txJSON.Flags >>> 0
 }
 
-function scaleValue(value, multiplier, extra=0) {
+function scaleValue(value, multiplier, extra = 0) {
   return (new BigNumber(value)).times(multiplier).plus(extra).toString()
 }
 
@@ -73,7 +73,7 @@ function prepareTransaction(txJSON: Object, api: Object,
         if (instructions.maxFee !== undefined) {
           const maxFeeDrops = common.xrpToDrops(instructions.maxFee)
           const normalFee = scaleValue(feeDrops, multiplier, extraFee)
-          txJSON.Fee = BigNumber.min(normalFee, maxFeeDrops).toString();
+          txJSON.Fee = BigNumber.min(normalFee, maxFeeDrops).toString()
         } else {
           txJSON.Fee = scaleValue(feeDrops, multiplier, extraFee)
         }