diff --git a/package.json b/package.json
index c1903f2..3f8b47a 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   },
   "homepage": "https://github.com/drpaulbrewer/positive-number-array#readme",
   "devDependencies": {
-    "coveralls": "^3.0.0",
+    "coveralls": "^3.0.13",
     "istanbul": "^0.4.2",
     "mocha": "^6.1.4",
     "should": "^13.2.0"