diff --git a/package.json b/package.json
index 635a9a16..e7a45bc9 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "markdownlint-cli": "^0.5.0",
     "npm-run-all": "^4.1.2",
     "prepend-file-cli": "^1.0.6",
-    "prettier": "^1.8.2",
+    "prettier": "^1.9.1",
     "semver": "^5.4.1",
     "standard-version": "^4.2.0",
     "yargs": "^10.0.3"
diff --git a/yarn.lock b/yarn.lock
index 278a810a..91c23887 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3346,9 +3346,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@^1.8.2:
-  version "1.8.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.8.2.tgz#bff83e7fd573933c607875e5ba3abbdffb96aeb8"
+prettier@^1.9.1:
+  version "1.9.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.1.tgz#41638a0d47c1efbd1b7d5a742aaa5548eab86d70"
 
 pretty-format@^21.2.1:
   version "21.2.1"