diff --git a/package.json b/package.json
index 470961ce..fbc7e333 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "@openzeppelin/contracts-ethereum-package": "2.5.0",
     "@openzeppelin/test-helpers": "0.5.6",
     "@openzeppelin/upgrades": "2.8.0",
-    "bignumber.js": "9.0.1",
+    "bignumber.js": "9.1.2",
     "ethereum-waffle": "2.5.1",
     "ethereumjs-util": "7.0.6",
     "hardlydifficult-eth": "1.1.3",