diff --git a/package.json b/package.json
index 425c9894..83822942 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     },
     "devDependencies": {
         "@typechain/web3-v1": "1.0.0",
-        "@types/bn.js": "4.11.6",
+        "@types/bn.js": "5.1.0",
         "@types/node": "^10.14.5",
         "chai": "4.2.0",
         "chai-as-promised": "7.1.1",
diff --git a/yarn.lock b/yarn.lock
index 9e3478d8..81c3f5a8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -123,10 +123,10 @@
   resolved "https://registry.yarnpkg.com/@typechain/web3-v1/-/web3-v1-1.0.0.tgz#842f925e45bdfb0d28e08c0e355f1c8efed7ea91"
   integrity sha512-MM8PmsblePaxy5BCYEuPtR4ajigPf504VRQzZgFYqs6KuFnJxbOjF8jNYT12P6UvUX7us75Wc78QdbvOHbb4hA==
 
-"@types/bn.js@4.11.6":
-  version "4.11.6"
-  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.6.tgz#c306c70d9358aaea33cd4eda092a742b9505967c"
-  integrity sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==
+"@types/bn.js@5.1.0":
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-5.1.0.tgz#32c5d271503a12653c62cf4d2b45e6eab8cebc68"
+  integrity sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==
   dependencies:
     "@types/node" "*"