diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml
index 6d5e32d8..67cdb8a4 100644
--- a/codegen/Cargo.toml
+++ b/codegen/Cargo.toml
@@ -16,11 +16,11 @@ plugin = true
 
 [dependencies]
 rocket = { version = "0.2.8", path = "../lib/" }
-log = "^0.3"
+log = "0.3"
 
 [dev-dependencies]
-compiletest_rs = "^0.2"
+compiletest_rs = "0.2"
 
 [build-dependencies]
 yansi = "0.2"
-version_check = "0.1"
+version_check = "0.1.2"
diff --git a/codegen/build.rs b/codegen/build.rs
index 3c7f2572..ac0deddf 100644
--- a/codegen/build.rs
+++ b/codegen/build.rs
@@ -5,7 +5,7 @@ extern crate yansi;
 extern crate version_check;
 
 use yansi::Color::{Red, Yellow, Blue, White};
-use version_check::{is_nightly, is_min_version, is_min_date};
+use version_check::{supports_features, is_min_version, is_min_date};
 
 // Specifies the minimum nightly version needed to compile Rocket's codegen.
 const MIN_DATE: &'static str = "2017-06-01";
@@ -21,7 +21,7 @@ macro_rules! printerr {
 }
 
 fn main() {
-    let ok_nightly = is_nightly();
+    let ok_channel = supports_features();
     let ok_version = is_min_version(MIN_VERSION);
     let ok_date = is_min_date(MIN_DATE);
 
@@ -33,12 +33,12 @@ fn main() {
                   Yellow.paint(format!("{} ({})", MIN_VERSION, MIN_DATE)));
     };
 
-    match (ok_nightly, ok_version, ok_date) {
-        (Some(is_nightly), Some((ok_version, version)), Some((ok_date, date))) => {
-            if !is_nightly {
+    match (ok_channel, ok_version, ok_date) {
+        (Some(ok_channel), Some((ok_version, version)), Some((ok_date, date))) => {
+            if !ok_channel {
                 printerr!("{} {}",
                           Red.paint("Error:").bold(),
-                          White.paint("Rocket requires a nightly version of Rust."));
+                          White.paint("Rocket requires a nightly or dev version of Rust."));
                 print_version_err(&*version, &*date);
                 printerr!("{}{}{}",
                           Blue.paint("See the getting started guide ("),
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 9c7b4226..dcffce68 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -48,4 +48,4 @@ rocket_codegen = { version = "0.2.8", path = "../codegen" }
 
 [build-dependencies]
 yansi = "0.2"
-version_check = "^0.1"
+version_check = "0.1.2"
diff --git a/lib/build.rs b/lib/build.rs
index 6768de95..726b3e97 100644
--- a/lib/build.rs
+++ b/lib/build.rs
@@ -5,7 +5,7 @@ extern crate yansi;
 extern crate version_check;
 
 use yansi::Color::{Red, Yellow, Blue, White};
-use version_check::{is_nightly, is_min_version};
+use version_check::{supports_features, is_min_version};
 
 // Specifies the minimum nightly version needed to compile Rocket.
 const MIN_VERSION: &'static str = "1.19.0-nightly";
@@ -20,7 +20,7 @@ macro_rules! printerr {
 }
 
 fn main() {
-    let (ok_nightly, ok_version) = (is_nightly(), is_min_version(MIN_VERSION));
+    let (ok_channel, ok_version) = (supports_features(), is_min_version(MIN_VERSION));
     let print_version_err = |version: &str| {
         printerr!("{} {}. {} {}.",
                   White.paint("Installed version is:"),
@@ -29,11 +29,11 @@ fn main() {
                   Yellow.paint(MIN_VERSION));
     };
 
-    if let (Some(is_nightly), Some((ok_version, version))) = (ok_nightly, ok_version) {
-        if !is_nightly {
+    if let (Some(ok_channel), Some((ok_version, version))) = (ok_channel, ok_version) {
+        if !ok_channel {
             printerr!("{} {}",
                       Red.paint("Error:").bold(),
-                      White.paint("Rocket requires a nightly version of Rust."));
+                      White.paint("Rocket requires a nightly or dev version of Rust."));
             print_version_err(&*version);
             printerr!("{}{}{}",
                       Blue.paint("See the getting started guide ("),