diff --git a/Cargo.toml b/Cargo.toml
index c865d72..7e5f88b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ ark-relations = { git = "https://github.com/arkworks-rs/snark", default-features
 
 derivative = { version = "2", features = ["use_core"] }
 tracing = { version = "0.1", default-features = false, features = [ "attributes" ] }
-num-bigint = {version = "0.3", default-features = false }
+num-bigint = {version = "0.4", default-features = false }
 num-traits = {version = "0.2", default-features = false }
 
 [dev-dependencies]