diff --git a/package.json b/package.json
index 7c70332..cd03a98 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "eslint-config-prettier": "2.9.0",
     "eslint-plugin-prettier": "2.6.0",
     "fhir-errors": "1.0.0",
-    "prettier": "1.12.1",
+    "prettier": "1.18.2",
     "sinon": "5.0.7",
     "tap": "12.0.1"
   },
diff --git a/yarn.lock b/yarn.lock
index b517e4b..1623faa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1902,9 +1902,9 @@ prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
 
-prettier@1.12.1:
-  version "1.12.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.12.1.tgz#c1ad20e803e7749faf905a409d2367e06bbe7325"
+prettier@1.18.2:
+  version "1.18.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
 
 process-nextick-args@~2.0.0:
   version "2.0.0"