diff --git a/package.json b/package.json
index 6f1c9141..cfbaff0e 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "jest": "23.6.0",
     "lerna": "3.22.1",
     "lint-staged": "8.2.1",
-    "prettier": "1.19.1",
+    "prettier": "2.3.1",
     "renovate-config-nju33": "0.0.1",
     "tslint": "5.20.1",
     "typescript": "3.4.5"
diff --git a/packages/gsw/package.json b/packages/gsw/package.json
index bfdc6624..e54f789e 100644
--- a/packages/gsw/package.json
+++ b/packages/gsw/package.json
@@ -36,7 +36,7 @@
     "coveralls": "3.1.0",
     "jest": "23.6.0",
     "lerna": "3.22.1",
-    "prettier": "1.19.1",
+    "prettier": "2.3.1",
     "renovate-config-nju33": "0.0.1",
     "rollup": "1.32.1",
     "ts-jest": "23.10.5",
diff --git a/yarn.lock b/yarn.lock
index 4898b93b..c13715da 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9179,10 +9179,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@1.19.1:
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
-  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
+prettier@2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.1.tgz#76903c3f8c4449bc9ac597acefa24dc5ad4cbea6"
+  integrity sha512-p+vNbgpLjif/+D+DwAZAbndtRrR0md0MwfmOVN9N+2RgyACMT+7tfaRnT+WDPkqnuVwleyuBIG2XBxKDme3hPA==
 
 pretty-format@^23.6.0:
   version "23.6.0"