diff --git a/package-lock.json b/package-lock.json
index ca1dd33..c39578a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -63,9 +63,9 @@
       "dev": true
     },
     "big.js": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
-      "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ=="
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/big.js/-/big.js-6.1.1.tgz",
+      "integrity": "sha512-1vObw81a8ylZO5ePrtMay0n018TcftpTA5HFKDaSuiUDBo8biRBtjIobw60OpwuvrGk+FsxKamqN4cnmj/eXdg=="
     },
     "binary-extensions": {
       "version": "2.1.0",
diff --git a/package.json b/package.json
index 4c04c6c..c40a287 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "url": "https://github.com/Tabcorp/dollar-string/issues"
   },
   "dependencies": {
-    "big.js": "~5.2.2"
+    "big.js": "~6.1.1"
   },
   "devDependencies": {
     "mocha": "~8.1.0",