diff --git a/asio-sys/Cargo.toml b/asio-sys/Cargo.toml
index 34f598a..b1208d5 100644
--- a/asio-sys/Cargo.toml
+++ b/asio-sys/Cargo.toml
@@ -11,6 +11,5 @@ cc = "1.0.25"
 
 [dependencies]
 lazy_static = "1.0.0"
-num = "0.1.42"
-num-traits = "0.2.2"
-num-derive = "0.2.0"
+num-derive = "0.2"
+num-traits = "0.2"
diff --git a/asio-sys/src/bindings/mod.rs b/asio-sys/src/bindings/mod.rs
index 38617af..1ff86af 100644
--- a/asio-sys/src/bindings/mod.rs
+++ b/asio-sys/src/bindings/mod.rs
@@ -2,6 +2,7 @@ mod asio_import;
 #[macro_use]
 pub mod errors;
 
+use num_traits::FromPrimitive;
 use self::errors::{AsioError, AsioErrorWrapper, LoadDriverError};
 use std::ffi::CStr;
 use std::ffi::CString;
@@ -320,7 +321,7 @@ impl Driver {
         };
         unsafe {
             asio_result!(ai::ASIOGetChannelInfo(&mut channel_info))?;
-            Ok(num::FromPrimitive::from_i32(channel_info.type_).expect("failed to cast sample type"))
+            Ok(FromPrimitive::from_i32(channel_info.type_).expect("failed to cast sample type"))
         }
     }
 
diff --git a/asio-sys/src/lib.rs b/asio-sys/src/lib.rs
index 9a2acc6..a071e7b 100644
--- a/asio-sys/src/lib.rs
+++ b/asio-sys/src/lib.rs
@@ -4,10 +4,11 @@
 #[macro_use]
 extern crate lazy_static;
 
-extern crate num;
 #[allow(unused_imports)]
 #[macro_use]
 extern crate num_derive;
+#[allow(unused_imports)]
+extern crate num_traits;
 
 #[cfg(asio)]
 pub mod bindings;