diff --git a/package-lock.json b/package-lock.json
index 2f77ce5f..bfa47bd8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3435,9 +3435,9 @@
       "integrity": "sha512-+hN/Zh2D08Mx65pZ/4g5bsmNiZUuChDiQfTUQ7qJr4/kuopCr88xZsAXv6mBoZEsUI4OuGHlX59qE94K2mMW8Q=="
     },
     "bignumber.js": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-3.0.1.tgz",
-      "integrity": "sha1-gHZS0Q453jfp40lyR+3HmLt0b3Y="
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-9.0.0.tgz",
+      "integrity": "sha512-t/OYhhJ2SD+YGBQcjY8GzzDHEk9f3nerxjtfa6tlMXfe7frs/WozhvCNoGvpM0P3bNf3Gq5ZRMlGr5f3r4/N8A=="
     },
     "binary-extensions": {
       "version": "1.11.0",
diff --git a/package.json b/package.json
index c0e0b407..42a5cbd8 100644
--- a/package.json
+++ b/package.json
@@ -135,7 +135,7 @@
     "@parity/api": "^2.1.23",
     "@parity/wordlist": "1.1.x",
     "base32.js": "0.1.0",
-    "bignumber.js": "3.0.1",
+    "bignumber.js": "9.0.0",
     "blockies": "0.0.2",
     "brace": "0.11.1",
     "bytes": "3.1.0",