mozilla · emilio · Aug 25, 2023 · Jul 22, 2023 · Jul 22, 2023 · Jul 22, 2023
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -26,7 +26,7 @@ serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 serde_json = "1.0"
 tempfile = "3"
 toml = "0.5"
-proc-macro2 = "1"
+proc-macro2 = "1.0.60"
 quote = "1"
 heck = "0.4"
 

diff --git a/contributing.md b/contributing.md
@@ -16,6 +16,7 @@ There is continuous integration setup for `cbindgen` using [GitHub Actions](http
 
 In addition to a C/C++ compiler `cargo test` requires Python and Cython
 (`python -m pip install Cython`) for checking Cython bindings generated from tests (`.pyx` files).
+Note that the tests will be failed with Cython 3.x or later.
 
 Please run `cargo test` before filing a pull request to be sure that all tests pass. This will also update the test expectations.
 

diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"