diff --git a/pubspec.yaml b/pubspec.yaml
index 1a3b507..e038796 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -17,7 +17,7 @@ dependencies:
   decimal: ^3.0.1
   bip32: ^2.0.0
   convert: ^3.1.1
-  pointycastle: ^3.6.2
+  pointycastle: ^4.0.0
   http: ^1.0.0
   meta: ^1.12.0