diff --git a/package.json b/package.json
index d9cb1fc..3797821 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "koa-send": "^4.1.0",
     "koa-static": "^3.0.0",
     "koa-static-folder": "^0.1.6",
-    "mongodb": "^2.2.29",
+    "mongodb": "^3.1.13",
     "request": "^2.81.0",
     "webpack": "^3.0.0"
   }
diff --git a/yarn.lock b/yarn.lock
index 4955a9a..73e1f33 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -676,9 +676,9 @@ browserify-zlib@^0.1.4:
   dependencies:
     pako "~0.2.0"
 
-bson@~1.0.4:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/bson/-/bson-1.0.4.tgz#93c10d39eaa5b58415cbc4052f3e53e562b0b72c"
+bson@^1.1.0:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/bson/-/bson-1.1.5.tgz#2aaae98fcdf6750c0848b0cba1ddec3c73060a34"
 
 buffer-shims@~1.0.0:
   version "1.0.0"
@@ -1071,10 +1071,6 @@ es6-map@^0.1.3:
     es6-symbol "~3.1.1"
     event-emitter "~0.3.5"
 
-es6-promise@3.2.1:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-3.2.1.tgz#ec56233868032909207170c39448e24449dd1fc4"
-
 es6-set@~0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/es6-set/-/es6-set-0.1.5.tgz#d2b3ec5d4d800ced818db538d28974db0a73ccb1"
@@ -1940,6 +1936,10 @@ memory-fs@^0.4.0, memory-fs@~0.4.1:
     errno "^0.1.3"
     readable-stream "^2.0.1"
 
+memory-pager@^1.0.2:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/memory-pager/-/memory-pager-1.5.0.tgz#d8751655d22d384682741c972f2c3d6dfa3e66b5"
+
 merge-descriptors@1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
@@ -2023,20 +2023,22 @@ minimist@^1.2.0:
   dependencies:
     minimist "0.0.8"
 
-mongodb-core@2.1.13:
-  version "2.1.13"
-  resolved "https://registry.yarnpkg.com/mongodb-core/-/mongodb-core-2.1.13.tgz#771ef638270ac993ab42984689ab824251b96a88"
+mongodb-core@3.1.11:
+  version "3.1.11"
+  resolved "https://registry.yarnpkg.com/mongodb-core/-/mongodb-core-3.1.11.tgz#b253038dbb4d7329f3d1c2ee5400bb0c9221fde5"
   dependencies:
-    bson "~1.0.4"
-    require_optional "~1.0.0"
+    bson "^1.1.0"
+    require_optional "^1.0.1"
+    safe-buffer "^5.1.2"
+  optionalDependencies:
+    saslprep "^1.0.0"
 
-mongodb@^2.2.29:
-  version "2.2.29"
-  resolved "https://registry.yarnpkg.com/mongodb/-/mongodb-2.2.29.tgz#36b244126f26766c5ebd6465b8ab5b542d6833c5"
+mongodb@^3.1.13:
+  version "3.1.13"
+  resolved "https://registry.yarnpkg.com/mongodb/-/mongodb-3.1.13.tgz#f8cdcbb36ad7a08b570bd1271c8525753f75f9f4"
   dependencies:
-    es6-promise "3.2.1"
-    mongodb-core "2.1.13"
-    readable-stream "2.2.7"
+    mongodb-core "3.1.11"
+    safe-buffer "^5.1.2"
 
 ms@2.0.0:
   version "2.0.0"
@@ -2412,7 +2414,7 @@ read-pkg@^1.0.0:
     normalize-package-data "^2.3.2"
     path-type "^1.0.0"
 
-readable-stream@2.2.7, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.6:
+readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.6:
   version "2.2.7"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.2.7.tgz#07057acbe2467b22042d36f98c5ad507054e95b1"
   dependencies:
@@ -2527,7 +2529,7 @@ require-main-filename@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-1.0.1.tgz#97f717b69d48784f5f526a6c5aa8ffdda055a4d1"
 
-require_optional@~1.0.0:
+require_optional@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/require_optional/-/require_optional-1.0.1.tgz#4cf35a4247f64ca3df8c2ef208cc494b1ca8fc2e"
   dependencies:
@@ -2564,10 +2566,20 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^2.0.0"
     inherits "^2.0.1"
 
-safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@~5.1.0:
+safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.2:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+
+safe-buffer@~5.1.0:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.1.tgz#893312af69b2123def71f57889001671eeb2c853"
 
+saslprep@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/saslprep/-/saslprep-1.0.3.tgz#4c02f946b56cf54297e347ba1093e7acac4cf226"
+  dependencies:
+    sparse-bitfield "^3.0.3"
+
 "semver@2 || 3 || 4 || 5", semver@^5.1.0, semver@^5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"
@@ -2653,6 +2665,12 @@ source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, sour
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
 
+sparse-bitfield@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz#ff4ae6e68656056ba4b3e792ab3334d38273ca11"
+  dependencies:
+    memory-pager "^1.0.2"
+
 spdx-correct@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/spdx-correct/-/spdx-correct-1.0.2.tgz#4b3073d933ff51f3912f03ac5519498a4150db40"