diff --git a/package-lock.json b/package-lock.json
index 1f00a4a..42bbbee 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -135,9 +135,9 @@
       "dev": true
     },
     "bn.js": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-NiyuqJjtPhXcJDc8I+YeyZceSMViT39AvuFJCH3ieMcOsRvZsp2luMrGSnQaqN6HVJMvSgydLnkvw5N4xvuIoQ=="
     },
     "brace-expansion": {
       "version": "1.1.11",
diff --git a/package.json b/package.json
index 8427730..36f0cb9 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "mocha": "^2.3.4"
   },
   "dependencies": {
-    "bn.js": "^4.0.0",
+    "bn.js": "^5.0.0",
     "inherits": "^2.0.1",
     "minimalistic-assert": "^1.0.0"
   }