diff --git a/package.json b/package.json
index efcd013..7d65883 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "ava": "0.25.0",
     "concurrently": "3.6.1",
     "coveralls": "3.0.2",
-    "nyc": "11.8.0",
+    "nyc": "11.9.0",
     "publish-please": "3.2.0",
     "sinon": "6.1.4",
     "tslint": "5.11.0",
diff --git a/yarn.lock b/yarn.lock
index 55f44dd..44c044a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3210,9 +3210,9 @@ number-is-nan@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
 
-nyc@11.8.0:
-  version "11.8.0"
-  resolved "https://registry.yarnpkg.com/nyc/-/nyc-11.8.0.tgz#1e8453b0644f8fea4d829b1a6636663157cd3b00"
+nyc@11.9.0:
+  version "11.9.0"
+  resolved "https://registry.yarnpkg.com/nyc/-/nyc-11.9.0.tgz#4106e89e8fbe73623a1fc8b6ecb7abaa271ae1e4"
   dependencies:
     archy "^1.0.0"
     arrify "^1.0.1"