diff --git a/crates/rome_diagnostics/src/error.rs b/crates/rome_diagnostics/src/error.rs
index 3cd28773e6c..fd31590cf66 100644
--- a/crates/rome_diagnostics/src/error.rs
+++ b/crates/rome_diagnostics/src/error.rs
@@ -167,6 +167,7 @@ struct ErrorVTable {
 
 /// Internal storage struct used to pack a vtable instance along with a
 /// diagnostic object.
+#[repr(C)]
 struct ErrorImpl<D = ()> {
     vtable: &'static ErrorVTable,
     diag: D,
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index aef0a9a008f..64d7edff80b 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -2,4 +2,4 @@
 # The default profile includes rustc, rust-std, cargo, rust-docs, rustfmt and clippy.
 # https://rust-lang.github.io/rustup/concepts/profiles.html
 profile = "default"
-channel = "1.66.1"
+channel = "1.67.1"