diff --git a/.travis.yml b/.travis.yml
index 87162cb..9b511ac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 sudo: false
 language: rust
 rust:
-- nightly-2017-07-13
+- nightly-2017-07-21
 addons:
   apt:
     packages:
@@ -16,9 +16,9 @@ script:
 - |
   travis-cargo build -- --all-features --all &&
   travis-cargo test -- --all-features --all &&
-  travis-cargo --only nightly-2017-07-13 doc -- --no-deps --all-features --all
+  travis-cargo --only nightly-2017-07-21 doc -- --no-deps --all-features --all
 after_success:
-- travis-cargo --only nightly-2017-07-13 doc-upload
+- travis-cargo --only nightly-2017-07-21 doc-upload
 env:
   global:
   - TRAVIS_CARGO_NIGHTLY_FEATURE=""
diff --git a/README.md b/README.md
index c16ee39..80b48c8 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Rocket requires nightly Rust. You should probably install Rust with
 See
 [installation instructions](https://rocket.rs/guide/getting-started/#installing-rust).
 
-In particular, `rocket_cors` is currently targetted for `nightly-2017-07-13`. Newer nightlies
+In particular, `rocket_cors` is currently targetted for `nightly-2017-07-21`. Newer nightlies
 might work, but it's not guaranteed.
 
 ## Installation
diff --git a/build.rs b/build.rs
index 729aec6..95b5a5e 100644
--- a/build.rs
+++ b/build.rs
@@ -11,7 +11,7 @@ use version_check::{is_nightly, is_min_version, is_min_date};
 // Specifies the minimum nightly version that is targetted
 // Note that sometimes the `rustc` date might be older than the nightly version,
 // usually one day older
-const MIN_DATE: &'static str = "2017-07-12";
+const MIN_DATE: &'static str = "2017-07-20";
 const MIN_VERSION: &'static str = "1.20.0-nightly";
 
 // Convenience macro for writing to stderr.
diff --git a/rust-toolchain b/rust-toolchain
index 8dd0f7b..253d1d7 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2017-07-13
+nightly-2017-07-21
diff --git a/src/lib.rs b/src/lib.rs
index a9f78a7..f3113fc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,7 +19,7 @@
 //! stable. See
 //! [installation instructions](https://rocket.rs/guide/getting-started/#installing-rust).
 //!
-//! In particular, `rocket_cors` is currently targetted for `nightly-2017-07-13`. Newer nightlies
+//! In particular, `rocket_cors` is currently targetted for `nightly-2017-07-21`. Newer nightlies
 //! might work, but it's not guaranteed.
 //!
 //! ## Installation