diff --git a/Cargo.toml b/Cargo.toml
index 37a85c7..ec73421 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 base64 = "0.23.1"
 tracing = "0.1"
-num-bigint = "0.4"
+num-bigint = "0.5"
 num-traits = "0.2"
 sha1 = "0.10"
 sha2 = "0.10"