diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index 5a7c1ab1..de09ac68 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -42,11 +42,9 @@
     "@iov/encoding": "^2.1.0",
     "@iov/utils": "^2.0.2",
     "axios": "^0.19.0",
-    "bn.js": "^5.1.1",
     "pako": "^1.0.11"
   },
   "devDependencies": {
-    "@types/bn.js": "^4.11.6",
     "@types/pako": "^1.0.1",
     "readonly-date": "^1.0.0"
   }