diff --git a/lib/utils/signature.js b/lib/utils/signature.js
index e2e96af..e5fb0f8 100644
--- a/lib/utils/signature.js
+++ b/lib/utils/signature.js
@@ -176,7 +176,7 @@ class LedgerSignature {
    */
 
   fromDER(der) {
-    const sig = secp256k1.fromDER(der);
+    const sig = secp256k1.signatureImport(der);
 
     return this.decode(sig);
   }
@@ -187,7 +187,7 @@ class LedgerSignature {
    */
 
   toDER() {
-    return secp256k1.toDER(this.encode());
+    return secp256k1.signatureExport(this.encode());
   }
 
   /**
diff --git a/package-lock.json b/package-lock.json
index 2016ca6..8b09ca3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -118,9 +118,9 @@
       }
     },
     "bcrypto": {
-      "version": "3.1.11",
-      "resolved": "https://registry.npmjs.org/bcrypto/-/bcrypto-3.1.11.tgz",
-      "integrity": "sha512-XHsle+v0aYjCyHZSwd3Insnu8GUe4cuf3+f07Z/mO+GLq60YqUyEIvpaSv4LAAJ4uf8UNYMSSQ0LslsV0r4tug==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bcrypto/-/bcrypto-4.0.1.tgz",
+      "integrity": "sha512-aLH/BmVyasy9iQkrmQTg+9MRU+77zOpEBiBflaXFC4YQJNICG/NjkEEluinnvAOQWGiM4HsGcfrVFJNJQz8jxQ==",
       "requires": {
         "bsert": "~0.0.10",
         "bufio": "~1.0.6",
diff --git a/package.json b/package.json
index bc53e3b..48ab6fd 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "./lib/bledger": "./lib/bledger-browser.js"
   },
   "dependencies": {
-    "bcrypto": "^3.1.6",
+    "bcrypto": "^4.0.1",
     "blgr": "~0.1.7",
     "bmutex": "~0.1.6",
     "bsert": "~0.0.10",