diff --git a/crates/numtower/Cargo.toml b/crates/numtower/Cargo.toml
index 3d9b93c0..54ca4e27 100644
--- a/crates/numtower/Cargo.toml
+++ b/crates/numtower/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["mathematics"]
 [dependencies]
 rust_decimal = { version = "1.43", default-features = false, features = ["std"] }
 num-rational = { version = "0.4.2", default-features = false }
-num-bigint = { version = "0.5", default-features = false, features = ["std"] }
+num-bigint = { version = "0.4", default-features = false, features = ["std"] }
 num-integer = { version = "0.1", default-features = false }
 num-traits = { version = "0.2", default-features = false, features = ["std"] }