diff --git a/package.json b/package.json
index dc47cdd3..811978bf 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
   "devDependencies": {
     "@commitlint/cli": "^7.6.0",
     "@commitlint/config-conventional": "^7.6.0",
-    "@sourcegraph/prettierrc": "^2.2.0",
+    "@sourcegraph/prettierrc": "^3.0.0",
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^13.2.0",
     "@types/expect": "1.20.4",
diff --git a/tsconfig.json b/tsconfig.json
index 5e562e1e..217f59a3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,6 +12,6 @@
     "noEmit": true,
     "rootDir": "src",
     "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true
-  }
+    "allowSyntheticDefaultImports": true,
+  },
 }
diff --git a/yarn.lock b/yarn.lock
index 3ac2f369..16868de5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -876,10 +876,10 @@
   resolved "https://registry.yarnpkg.com/@sinonjs/text-encoding/-/text-encoding-0.7.1.tgz#8da5c6530915653f3a1f38fd5f101d8c3f8079c5"
   integrity sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==
 
-"@sourcegraph/prettierrc@^2.2.0":
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/@sourcegraph/prettierrc/-/prettierrc-2.2.0.tgz#af4a6fcd465b0a39a07ffbd8f2d3414d01e603e8"
-  integrity sha512-kRdHxdAppxYnN7qAQjNTyuG05pjYHFtEUquZauXVXBeaGB4sye3uSkb8wgi34jeaUHG/gWp2f5hQgCCBMizjjA==
+"@sourcegraph/prettierrc@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@sourcegraph/prettierrc/-/prettierrc-3.0.0.tgz#716b64b287565f98f539f76bea206912ab4d03b3"
+  integrity sha512-ziLujsC3IESHGYdtiJ7yVjte9i7mr6jKWTYtCVqgOWeY1Er0/xsQ/sdZIyK61tD282wvd7VjS4pk5RoGEN7biw==
 
 "@sourcegraph/tsconfig@^4.0.0":
   version "4.0.0"