diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0b51fac3..cb96e48f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,7 @@ env:
   CARGO_TERM_COLOR: always
   CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
   # Keep in sync with version in `rust-toolchain.toml` and `xtask/src/ci.rs`
-  NIGHTLY: nightly-2024-02-14
+  NIGHTLY: nightly-2024-05-09
 
 on:
   push:
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 90c225f3..647f9a1c 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
 # Keep in sync with version in `xtask/src/ci.rs` and `.github/workflows/ci.yml`
-channel = "nightly-2024-02-14"
+channel = "nightly-2024-05-09"
 components = ["rustfmt", "clippy"]
diff --git a/xtask/src/ci.rs b/xtask/src/ci.rs
index 37db97a7..0f110314 100644
--- a/xtask/src/ci.rs
+++ b/xtask/src/ci.rs
@@ -238,7 +238,7 @@ impl CiTask {
         cmd!(
             "
             rustup run {NIGHTLY} cargo check
-                --workspace --all-features -Z unstable-options -Z check-cfg
+                --workspace --all-features -Z unstable-options
             "
         )
         .env(
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index f62f7444..c917863d 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -15,7 +15,7 @@ use serde::Deserialize;
 use serde_json::from_str as from_json_str;
 
 // Keep in sync with version in `rust-toolchain.toml` and `.github/workflows/ci.yml`
-const NIGHTLY: &str = "nightly-2024-02-14";
+const NIGHTLY: &str = "nightly-2024-05-09";
 
 mod cargo;
 mod ci;