diff --git a/package.json b/package.json
index 5d055bd..927dee0 100644
--- a/package.json
+++ b/package.json
@@ -8,12 +8,12 @@
   "unpkg": "delaunator.min.js",
   "dependencies": {},
   "devDependencies": {
-    "eslint": "^5.4.0",
+    "eslint": "^5.5.0",
     "eslint-config-mourner": "^3.0.0",
-    "esm": "^3.0.80",
+    "esm": "^3.0.81",
     "rollup": "^0.65.0",
     "rollup-plugin-buble": "^0.19.2",
-    "rollup-plugin-terser": "^1.0.1",
+    "rollup-plugin-terser": "^2.0.2",
     "tape": "^4.9.1"
   },
   "repository": {