diff --git a/libs/antsi/rust-toolchain.toml b/libs/antsi/rust-toolchain.toml
index 4f539a7e1c7..b3b0ebf9b82 100644
--- a/libs/antsi/rust-toolchain.toml
+++ b/libs/antsi/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview']
diff --git a/libs/deer/rust-toolchain.toml b/libs/deer/rust-toolchain.toml
index dc3bce026fc..d4c9465f178 100644
--- a/libs/deer/rust-toolchain.toml
+++ b/libs/deer/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview', 'miri']
diff --git a/libs/deer/src/impls/core/ops.rs b/libs/deer/src/impls/core/ops.rs
index f3c7256aac1..91f9d294fcf 100644
--- a/libs/deer/src/impls/core/ops.rs
+++ b/libs/deer/src/impls/core/ops.rs
@@ -67,7 +67,7 @@ where
     }
 }
 
-pub struct BoundReflection<T: ?Sized>(fn() -> *const T);
+pub struct BoundReflection<T: ?Sized>(#[allow(dead_code)] fn() -> *const T);
 
 impl<T> Reflection for BoundReflection<T>
 where
@@ -261,7 +261,10 @@ where
     }
 }
 
-pub struct RangeReflection<T: ?Sized, U: ?Sized>(fn() -> *const T, fn() -> *const U);
+pub struct RangeReflection<T: ?Sized, U: ?Sized>(
+    #[allow(dead_code)] fn() -> *const T,
+    #[allow(dead_code)] fn() -> *const U,
+);
 
 impl<T, U> Reflection for RangeReflection<T, U>
 where
diff --git a/libs/error-stack/README.md b/libs/error-stack/README.md
index e63705b43d2..5cb44ff0350 100644
--- a/libs/error-stack/README.md
+++ b/libs/error-stack/README.md
@@ -8,7 +8,7 @@
 
 [![crates.io](https://img.shields.io/crates/v/error-stack)][crates.io]
 [![libs.rs](https://img.shields.io/badge/libs.rs-error--stack-orange)][libs.rs]
-[![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-01&color=blue)][rust-version]
+[![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-08&color=blue)][rust-version]
 [![documentation](https://img.shields.io/docsrs/error-stack)][documentation]
 [![license](https://img.shields.io/crates/l/error-stack)][license]
 [![discord](https://img.shields.io/discord/840573247803097118)][discord]
diff --git a/libs/error-stack/macros/README.md b/libs/error-stack/macros/README.md
index ba1a41ed0d4..2d89d11db6d 100644
--- a/libs/error-stack/macros/README.md
+++ b/libs/error-stack/macros/README.md
@@ -7,7 +7,7 @@
 
 [![crates.io](https://img.shields.io/crates/v/error-stack-macros)][crates.io]
 [![libs.rs](https://img.shields.io/badge/libs.rs-error--stack--macros-orange)][libs.rs]
-[![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-01&color=blue)][rust-version]
+[![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-08&color=blue)][rust-version]
 [![documentation](https://img.shields.io/docsrs/error-stack-macros)][documentation]
 [![license](https://img.shields.io/crates/l/error-stack)][license]
 [![discord](https://img.shields.io/discord/840573247803097118)][discord]
diff --git a/libs/error-stack/rust-toolchain.toml b/libs/error-stack/rust-toolchain.toml
index 38a3626bc30..9ec91bd4cce 100644
--- a/libs/error-stack/rust-toolchain.toml
+++ b/libs/error-stack/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
 # Please also update the badges in `README.md`s (`error-stack` and `error-stack-macros`), and `src/lib.rs`
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview', 'miri', 'rust-src']
diff --git a/libs/error-stack/src/fmt/hook.rs b/libs/error-stack/src/fmt/hook.rs
index af7e149f648..88d20d8dc04 100644
--- a/libs/error-stack/src/fmt/hook.rs
+++ b/libs/error-stack/src/fmt/hook.rs
@@ -73,6 +73,7 @@ crate::hook::context::impl_hook_context! {
     /// struct Warning(&'static str);
     /// struct HttpResponseStatusCode(u64);
     /// struct Suggestion(&'static str);
+    /// # #[allow(dead_code)]
     /// struct Secret(&'static str);
     ///
     /// Report::install_debug_hook::<HttpResponseStatusCode>(|HttpResponseStatusCode(value), context| {
diff --git a/libs/error-stack/src/lib.rs b/libs/error-stack/src/lib.rs
index bc66d5eb92f..f003559278d 100644
--- a/libs/error-stack/src/lib.rs
+++ b/libs/error-stack/src/lib.rs
@@ -2,7 +2,7 @@
 //!
 //! [![crates.io](https://img.shields.io/crates/v/error-stack)][crates.io]
 //! [![libs.rs](https://img.shields.io/badge/libs.rs-error--stack-orange)][libs.rs]
-//! [![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-01&color=blue)][rust-version]
+//! [![rust-version](https://img.shields.io/static/v1?label=Rust&message=1.63.0/nightly-2024-01-08&color=blue)][rust-version]
 //! [![discord](https://img.shields.io/discord/840573247803097118)][discord]
 //!
 //! [crates.io]: https://crates.io/crates/error-stack
@@ -78,10 +78,10 @@
 //! variant and can be used as a return type:
 //!
 //! ```rust
-//! # fn has_permission(_: usize, _: usize) -> bool { true }
-//! # fn get_user() -> Result<usize, AccessError> { Ok(0) }
-//! # fn get_resource() -> Result<usize, AccessError> { Ok(0) }
-//! # #[derive(Debug)] enum AccessError { PermissionDenied(usize, usize) }
+//! # fn has_permission(_: (), _: ()) -> bool { true }
+//! # fn get_user() -> Result<(), AccessError> { Ok(()) }
+//! # fn get_resource() -> Result<(), AccessError> { Ok(()) }
+//! # #[derive(Debug)] enum AccessError { PermissionDenied((), ()) }
 //! # impl core::fmt::Display for AccessError {
 //! #    fn fmt(&self, _: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { Ok(()) }
 //! # }
diff --git a/libs/error-stack/src/macros.rs b/libs/error-stack/src/macros.rs
index f015b55a964..4d90a43b999 100644
--- a/libs/error-stack/src/macros.rs
+++ b/libs/error-stack/src/macros.rs
@@ -106,6 +106,7 @@ pub mod __private {
 /// use error_stack::{report, Context};
 ///
 /// #[derive(Debug)]
+/// # #[allow(dead_code)]
 /// struct PermissionDenied(User, Resource);
 ///
 /// impl fmt::Display for PermissionDenied {
@@ -173,6 +174,7 @@ macro_rules! report {
 /// use error_stack::{bail, Context};
 ///
 /// #[derive(Debug)]
+/// # #[allow(dead_code)]
 /// struct PermissionDenied(User, Resource);
 ///
 /// impl fmt::Display for PermissionDenied {
@@ -222,6 +224,7 @@ macro_rules! bail {
 /// use error_stack::{ensure, Context};
 ///
 /// #[derive(Debug)]
+/// # #[allow(dead_code)]
 /// struct PermissionDenied(User, Resource);
 ///
 /// impl fmt::Display for PermissionDenied {
diff --git a/libs/error-stack/src/result.rs b/libs/error-stack/src/result.rs
index b58837ce3b0..aed22c31a70 100644
--- a/libs/error-stack/src/result.rs
+++ b/libs/error-stack/src/result.rs
@@ -14,10 +14,10 @@ use crate::{Context, Report};
 /// `Result` can also be used in `fn main()`:
 ///
 /// ```rust
-/// # fn has_permission(_: usize, _: usize) -> bool { true }
-/// # fn get_user() -> Result<usize, AccessError> { Ok(0) }
-/// # fn get_resource() -> Result<usize, AccessError> { Ok(0) }
-/// # #[derive(Debug)] enum AccessError { PermissionDenied(usize, usize) }
+/// # fn has_permission(_: (), _: ()) -> bool { true }
+/// # fn get_user() -> Result<(), AccessError> { Ok(()) }
+/// # fn get_resource() -> Result<(), AccessError> { Ok(()) }
+/// # #[derive(Debug)] enum AccessError { PermissionDenied((), ()) }
 /// # impl core::fmt::Display for AccessError {
 /// #    fn fmt(&self, _: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { Ok(()) }
 /// # }
diff --git a/libs/error-stack/tests/snapshots/doc/fmt__emit.snap b/libs/error-stack/tests/snapshots/doc/fmt__emit.snap
index bb6d299ab03..e1cb5ae9c89 100644
--- a/libs/error-stack/tests/snapshots/doc/fmt__emit.snap
+++ b/libs/error-stack/tests/snapshots/doc/fmt__emit.snap
@@ -1,5 +1,5 @@
 <b>invalid input parameter</b>
-├╴at <i>src/fmt/hook.rs:50:14</i>
+├╴at <i>src/fmt/hook.rs:51:14</i>
 ├╴backtrace (1)
 ├╴error code: 404
 ├╴suggestion (0)
diff --git a/libs/error-stack/tests/snapshots/doc/fmt__emit_alt.snap b/libs/error-stack/tests/snapshots/doc/fmt__emit_alt.snap
index 72bf99d1f7e..fbfca20c5f2 100644
--- a/libs/error-stack/tests/snapshots/doc/fmt__emit_alt.snap
+++ b/libs/error-stack/tests/snapshots/doc/fmt__emit_alt.snap
@@ -1,5 +1,5 @@
 <b>invalid input parameter</b>
-├╴at <i>src/fmt/hook.rs:50:14</i>
+├╴at <i>src/fmt/hook.rs:51:14</i>
 ├╴backtrace (1)
 ├╴error code: 404
 ├╴suggestion 0:
diff --git a/libs/sarif/rust-toolchain.toml b/libs/sarif/rust-toolchain.toml
index 4f539a7e1c7..b3b0ebf9b82 100644
--- a/libs/sarif/rust-toolchain.toml
+++ b/libs/sarif/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview']
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 4f539a7e1c7..b3b0ebf9b82 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview']
diff --git a/tests/hash-graph-integration/rust-toolchain.toml b/tests/hash-graph-integration/rust-toolchain.toml
index 4f539a7e1c7..b3b0ebf9b82 100644
--- a/tests/hash-graph-integration/rust-toolchain.toml
+++ b/tests/hash-graph-integration/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview']
diff --git a/tests/hash-graph-test-data/rust/rust-toolchain.toml b/tests/hash-graph-test-data/rust/rust-toolchain.toml
index 4f539a7e1c7..b3b0ebf9b82 100644
--- a/tests/hash-graph-test-data/rust/rust-toolchain.toml
+++ b/tests/hash-graph-test-data/rust/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2024-01-08"
 components = ['rustfmt', 'clippy', 'llvm-tools-preview']