diff --git a/package-lock.json b/package-lock.json
index 2647c86..7bef884 100644
--- a/package-lock.json
+++ b/package-lock.json
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diff --git a/package.json b/package.json
index 30062d3..6be7570 100644
--- a/package.json
+++ b/package.json
@@ -7,5 +7,8 @@
     "ethereum-waffle": "^3.2.2",
     "ethers": "^5.0.26",
     "hardhat": "^2.0.8"
+  },
+  "dependencies": {
+    "eth-sig-util": "^3.0.0"
   }
 }