diff --git a/package.json b/package.json
index 4a60c88..b6e7840 100644
--- a/package.json
+++ b/package.json
@@ -42,8 +42,8 @@
   },
   "homepage": "https://github.com/Rubilmax/ethers-maths#readme",
   "dependencies": {
-    "@ethersproject/bignumber": "^5.7.0",
-    "@ethersproject/units": "^5.7.0"
+    "@ethersproject/bignumber": "^5.0.0",
+    "@ethersproject/units": "^5.0.0"
   },
   "devDependencies": {
     "@trivago/prettier-plugin-sort-imports": "^3.3.0",
@@ -64,7 +64,10 @@
     "ts-jest": "^27.0.5",
     "typescript": "^4.7.4"
   },
-  "peerDependencies": {},
+  "peerDependencies": {
+    "@ethersproject/bignumber": "^5.0.0",
+    "@ethersproject/units": "^5.0.0"
+  },
   "config": {
     "commitizen": {
       "path": "./node_modules/cz-conventional-changelog"
diff --git a/src/index.ts b/src/index.ts
index 2cc51a3..11b747c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -16,7 +16,7 @@ const HALF_WAD_PERCENT_RATIO = WAD_PERCENT_RATIO.div(2);
 const RAY_PERCENT_RATIO = RAY.div(PERCENT);
 const HALF_RAY_PERCENT_RATIO = RAY_PERCENT_RATIO.div(2);
 
-declare module "@ethersproject/bignumber" {
+declare module "@ethersproject/bignumber/lib/bignumber" {
   interface BigNumber {
     min: (other: BigNumberish) => BigNumber;
     max: (other: BigNumberish) => BigNumber;
diff --git a/yarn.lock b/yarn.lock
index 3a6cc1f..39e0ee1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -421,7 +421,7 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
-"@ethersproject/bignumber@^5.7.0":
+"@ethersproject/bignumber@^5.0.0", "@ethersproject/bignumber@^5.7.0":
   version "5.7.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/bignumber/-/bignumber-5.7.0.tgz#e2f03837f268ba655ffba03a57853e18a18dc9c2"
   integrity sha512-n1CAdIHRWjSucQO3MC1zPSVgV/6dy/fjL9pMrPP9peL+QxEg9wOsVqwD4+818B6LUEtaXzVHQiuivzRoxPxUGw==
@@ -449,7 +449,7 @@
   resolved "https://registry.yarnpkg.com/@ethersproject/logger/-/logger-5.7.0.tgz#6ce9ae168e74fecf287be17062b590852c311892"
   integrity sha512-0odtFdXu/XHtjQXJYA3u9G0G8btm0ND5Cu8M7i5vhEcE8/HmF4Lbdqanwyv4uQTr2tx6b7fQRmgLrsnpQlmnig==
 
-"@ethersproject/units@^5.7.0":
+"@ethersproject/units@^5.0.0":
   version "5.7.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/units/-/units-5.7.0.tgz#637b563d7e14f42deeee39245275d477aae1d8b1"
   integrity sha512-pD3xLMy3SJu9kG5xDGI7+xhTEmGXlEqXU4OfNapmfnxLVY4EMSSRp7j1k7eezutBPH7RBN/7QPnwR7hzNlEFeg==