diff --git a/package.json b/package.json
index 4a6c3c2..879d657 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "vitest": "4.0.18"
   },
   "dependencies": {
+    "bignumber.js": "^9.3.1",
     "envio": "3.0.0-alpha.21",
     "viem": "^2.0.0"
   },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index bfc3560..72d6490 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      bignumber.js:
+        specifier: ^9.3.1
+        version: 9.3.1
       envio:
         specifier: 3.0.0-alpha.21
         version: 3.0.0-alpha.21(react-dom@19.2.4(react@19.2.4))(react@19.2.4)(typescript@5.9.3)