diff --git a/package.json b/package.json
index 0abe78c..b1c4285 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "@types/request": "2.0.8",
     "jest": "21.2.1",
     "jest-playback": "1.0.1",
-    "prettier": "1.7.4",
+    "prettier": "1.9.0",
     "prettier-config-ikatyang": "1.1.1",
     "ts-jest": "21.2.4",
     "ts-node": "3.3.0",
diff --git a/yarn.lock b/yarn.lock
index d37e2c3..a4e4c46 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2272,9 +2272,9 @@ prettier-config-ikatyang@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/prettier-config-ikatyang/-/prettier-config-ikatyang-1.1.1.tgz#9ccab4bc2d441e4c68b58dbe8f1a4e18213c3f2d"
 
-prettier@1.7.4:
-  version "1.7.4"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.7.4.tgz#5e8624ae9363c80f95ec644584ecdf55d74f93fa"
+prettier@1.9.0:
+  version "1.9.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.0.tgz#1a7205bdb6126b30cf8c0a7b2b86997162e1ee3e"
 
 pretty-format@^21.2.1:
   version "21.2.1"