diff --git a/Cargo.toml b/Cargo.toml
index 9da1da98..4ee498bd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,7 +38,7 @@ wasm-bindgen-test = "0.2"
 stdweb-internal-test-macro = { version = "0.1", path = "stdweb-internal-test-macro" }
 
 [build-dependencies]
-rustc_version = "0.2"
+rustc_version = "0.4"
 
 [features]
 default = ["serde", "serde_json"]
diff --git a/benchmarks/Cargo.toml b/benchmarks/Cargo.toml
index f9cc9b8b..51992b1b 100644
--- a/benchmarks/Cargo.toml
+++ b/benchmarks/Cargo.toml
@@ -10,4 +10,4 @@ serde = "1"
 serde_derive = "1"
 
 [build-dependencies]
-rustc_version = "0.2"
+rustc_version = "0.4"
diff --git a/build.rs b/build.rs
index 463d1669..df7e4ee1 100644
--- a/build.rs
+++ b/build.rs
@@ -1,10 +1,7 @@
 extern crate rustc_version;
-use rustc_version::{version, version_meta, Channel};
+use rustc_version::{version_meta, Channel};
 
 fn main() {
-    let mut current = version().unwrap();
-    current.pre = Vec::new();
-
     if version_meta().unwrap().channel == Channel::Nightly {
         println!( "cargo:rustc-cfg=rust_nightly" );
     }