diff --git a/package-lock.json b/package-lock.json
index 6ce09e96..60c4f6fd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3368,9 +3368,9 @@
       "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": "8.1.1",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-8.1.1.tgz",
+      "integrity": "sha512-QD46ppGintwPGuL1KqmwhR0O+N2cZUg8JG/VzwI2e28sM9TqHjQB10lI4QAaMHVbLzwVLLAwEglpKPViWX+5NQ=="
     },
     "binary-extensions": {
       "version": "1.11.0",
diff --git a/package.json b/package.json
index 71c2c84a..10455048 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": "8.1.1",
     "blockies": "0.0.2",
     "brace": "0.11.1",
     "bytes": "3.1.0",