diff --git a/package.json b/package.json
index 217107c..73afc73 100644
--- a/package.json
+++ b/package.json
@@ -5,12 +5,12 @@
   "main": "dist/index.js",
   "scripts": {
     "initdb-test": "tar -xzf test/fixtures/mesh_subset.nt.tar.gz -C test/fixtures; node_modules/levelgraph-n3/import.js test/fixtures/mesh_subset.nt -o ./dbtest; rm test/fixtures/mesh_subset.nt",
-    "test": "node_modules/.bin/mocha --reporter spec --compilers js:babel/register",
+    "test": "NODE_ENV=test node_modules/.bin/mocha --reporter spec --compilers js:babel/register",
     "initdb": "node_modules/levelgraph-n3/import.js $PATH_TO_MESH_RDF -o $PATH_TO_MESH_DB",
     "initdb-quiet": "node_modules/levelgraph-n3/import.js --quiet $PATH_TO_MESH_RDF -o $PATH_TO_MESH_DB",
     "build": "rm -rf dist && node_modules/.bin/babel --optional runtime src --out-dir dist",
     "prepublish": "npm run build",
-    "coverage": "rm -rf coverage; node_modules/.bin/babel-node -r node_modules/.bin/isparta cover _mocha --report lcovonly -- --reporter spec --compilers js:babel/register --bail",
+    "coverage": "rm -rf coverage; NODE_ENV=test node_modules/.bin/babel-node -r node_modules/.bin/isparta cover _mocha --report lcovonly -- --reporter spec --compilers js:babel/register --bail",
     "publish-coverage": "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
   },
   "repository": {
@@ -36,22 +36,22 @@
   },
   "devDependencies": {
     "babel": "^5.8.29",
-    "babel-eslint": "^4.1.1",
-    "chai": "^3.2.0",
+    "babel-eslint": "^4.1.3",
+    "chai": "^3.4.0",
     "coveralls": "^2.11.4",
     "eslint": "^1.7.3",
     "isparta": "^3.1.0",
-    "mocha": "^2.2.5"
+    "mocha": "^2.3.3",
+    "multilevel": "^7.2.0"
   },
   "dependencies": {
     "babel-runtime": "^5.8.29",
-    "bluebird": "^2.10.2",
+    "bluebird": "^3.0.2",
     "co": "^4.6.0",
     "level": "^1.3.0",
     "levelgraph": "^1.1.0",
     "levelgraph-n3": "^1.0.0",
     "lodash": "^3.10.1",
-    "multilevel": "^7.2.0",
     "request": "^2.65.0"
   }
 }
diff --git a/src/index.js b/src/index.js
index 8135dad..d2c64b0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -25,7 +25,7 @@ class MeshTree {
     }
 
     this.db = levelgraphN3(levelgraph(DB));
-    this.dbSearch = Bluebird.promisify(this.db.search);
+    this.dbSearch = Bluebird.promisify(this.db.search, {multiArgs: false});
 
   }
 }
diff --git a/src/lib/wikipedia.js b/src/lib/wikipedia.js
index 6d345d1..5dbc6a9 100644
--- a/src/lib/wikipedia.js
+++ b/src/lib/wikipedia.js
@@ -1,7 +1,7 @@
 import request from 'request';
 import Bluebird from 'bluebird';
 
-let requestPromise = Bluebird.promisify(request);
+let requestPromise = Bluebird.promisify(request, {multiArgs: true});
 
 export function* getMainSections(articleTitle) {