diff --git a/Cargo.toml b/Cargo.toml
index 05ae456..acfb072 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ edition = "2018"
 
 [dependencies]
 chrono     = { default-features = false, features = ["alloc"], version = "0.4" }
-num-bigint = { default-features = false, version = "0.3" }
+num-bigint = { default-features = false, version = "0.4" }
 num-traits = { default-features = false, version = "0.2" }
 thiserror  = { default-features = false, version = "1" }