diff --git a/HACKING.md b/HACKING.md
index fb16ccbe2a48..86443868d29e 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -22,8 +22,8 @@ cargo install --path=app/buck2
 Or, alternatively, install it directly from GitHub:
 
 ```sh
-rustup install nightly-2023-11-10
-cargo +nightly-2023-11-10 install --git https://github.com/facebook/buck2.git buck2
+rustup install nightly-2023-12-11
+cargo +nightly-2023-12-11 install --git https://github.com/facebook/buck2.git buck2
 ```
 
 ### Side note: using [Nix] to compile the source
diff --git a/app/buck2_audit_server/src/cell.rs b/app/buck2_audit_server/src/cell.rs
index d17a36038b55..e9ba9df0d6e3 100644
--- a/app/buck2_audit_server/src/cell.rs
+++ b/app/buck2_audit_server/src/cell.rs
@@ -66,7 +66,7 @@ impl AuditSubcommand for AuditCellCommand {
 }
 
 pub(crate) fn audit_cell(
-    aliases_to_resolve: &Vec<String>,
+    aliases_to_resolve: &[String],
     aliases: bool,
     cells: &CellResolver,
     cwd: &ProjectRelativePath,
diff --git a/app/buck2_build_api/src/deferred/calculation.rs b/app/buck2_build_api/src/deferred/calculation.rs
index 14044a6c507b..c94801447fd1 100644
--- a/app/buck2_build_api/src/deferred/calculation.rs
+++ b/app/buck2_build_api/src/deferred/calculation.rs
@@ -313,7 +313,7 @@ async fn compute_deferred(
     impl DeferredCompute {
         fn create_materializer_futs<'a>(
             &'a self,
-            materialized_artifacts: &'a Vec<ArtifactGroup>,
+            materialized_artifacts: &'a [ArtifactGroup],
             ctx: &'a DiceComputations,
             span: &'a Lazy<Option<Span>, impl FnOnce() -> Option<Span>>,
         ) -> impl Future<Output = anyhow::Result<HashMap<Artifact, ProjectRelativePathBuf>>> + 'a
diff --git a/app/buck2_critical_path/src/graph.rs b/app/buck2_critical_path/src/graph.rs
index ca1c5439a1c6..71eaa675a055 100644
--- a/app/buck2_critical_path/src/graph.rs
+++ b/app/buck2_critical_path/src/graph.rs
@@ -25,7 +25,7 @@ pub struct Graph {
 
 impl Graph {
     #[inline]
-    pub fn iter_vertices(&self) -> impl Iterator<Item = VertexId> + DoubleEndedIterator {
+    pub fn iter_vertices(&self) -> impl DoubleEndedIterator<Item = VertexId> {
         self.vertices.keys()
     }
 
diff --git a/app/buck2_critical_path/src/types.rs b/app/buck2_critical_path/src/types.rs
index c28bf907e893..0efea010b287 100644
--- a/app/buck2_critical_path/src/types.rs
+++ b/app/buck2_critical_path/src/types.rs
@@ -135,13 +135,13 @@ where
         Self(v, PhantomData)
     }
 
-    pub fn keys(&self) -> impl Iterator<Item = AbstractVertexId<Kind>> + DoubleEndedIterator {
+    pub fn keys(&self) -> impl DoubleEndedIterator<Item = AbstractVertexId<Kind>> {
         // By construction the length of this is always less than the maximum vertex id.
         let len: u32 = self.0.len().try_into().unwrap();
         (0..len).map(AbstractVertexId::new)
     }
 
-    pub fn iter(&self) -> impl Iterator<Item = (AbstractVertexId<Kind>, &T)> + DoubleEndedIterator {
+    pub fn iter(&self) -> impl DoubleEndedIterator<Item = (AbstractVertexId<Kind>, &T)> {
         self.keys().map(|k| (k, &self.0[k.0 as usize]))
     }
 
@@ -208,7 +208,7 @@ where
         Self(v)
     }
 
-    pub fn iter(&self) -> impl Iterator<Item = (AbstractVertexId<Kind>, &K)> + DoubleEndedIterator {
+    pub fn iter(&self) -> impl DoubleEndedIterator<Item = (AbstractVertexId<Kind>, &K)> {
         self.0.iter().map(|(key, idx)| (*idx, key))
     }
 
diff --git a/app/buck2_error/src/lib.rs b/app/buck2_error/src/lib.rs
index 397901e23098..75c3cfa82db4 100644
--- a/app/buck2_error/src/lib.rs
+++ b/app/buck2_error/src/lib.rs
@@ -10,7 +10,7 @@
 #![feature(error_generic_member_access)]
 #![feature(let_chains)]
 #![feature(trait_alias)]
-#![feature(trait_upcasting)]
+#![cfg_attr(fbcode_build, feature(trait_upcasting))]
 
 mod any;
 pub mod classify;
diff --git a/docs/getting_started.md b/docs/getting_started.md
index ea737fbfe4a1..59a5ef2a3ea3 100644
--- a/docs/getting_started.md
+++ b/docs/getting_started.md
@@ -18,8 +18,8 @@ To get started, first install [rustup](https://rustup.rs/), then compile the
 `buck2` executable:
 
 ```bash
-rustup install nightly-2023-11-10
-cargo +nightly-2023-11-10 install --git https://github.com/facebook/buck2.git buck2
+rustup install nightly-2023-12-11
+cargo +nightly-2023-12-11 install --git https://github.com/facebook/buck2.git buck2
 ```
 
 The above commands install `buck2` into a suitable directory, such as
diff --git a/rust-toolchain b/rust-toolchain
index a69e38c28838..c9b564ca9932 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -9,6 +9,6 @@
 #   * NOTE: You may have to change this file in a follow up commit as ocamlrep
 #     has a dependency on buck2 git trunk.
 
-# @rustc_version: rustc 1.75.0-nightly (0f44eb32f 2023-11-09)
-channel = "nightly-2023-11-10"
+# @rustc_version: rustc 1.76.0-nightly (d86d65bbc 2023-12-10)
+channel = "nightly-2023-12-11"
 components = ["llvm-tools-preview","rustc-dev","rust-src"]
diff --git a/starlark-rust/starlark/src/lib.rs b/starlark-rust/starlark/src/lib.rs
index 06da0d43a969..3e1a8e4ac90b 100644
--- a/starlark-rust/starlark/src/lib.rs
+++ b/starlark-rust/starlark/src/lib.rs
@@ -393,6 +393,7 @@
 // Features we use
 #![allow(stable_features)]
 #![allow(unknown_lints)] // for clippy::tuple_array_conversions
+#![cfg_attr(rust_nightly, allow(internal_features))]
 #![cfg_attr(rust_nightly, feature(const_type_id))]
 #![cfg_attr(rust_nightly, feature(core_intrinsics))]
 #![cfg_attr(rust_nightly, feature(cfg_sanitize))]
diff --git a/starlark-rust/starlark_map/src/lib.rs b/starlark-rust/starlark_map/src/lib.rs
index abf6a3933b48..f4df252eed3d 100644
--- a/starlark-rust/starlark_map/src/lib.rs
+++ b/starlark-rust/starlark_map/src/lib.rs
@@ -25,6 +25,7 @@
 #![cfg_attr(rust_nightly, feature(core_intrinsics))]
 #![cfg_attr(rust_nightly, feature(portable_simd))]
 #![cfg_attr(rust_nightly, feature(cfg_version))]
+#![cfg_attr(rust_nightly, allow(internal_features))]
 
 mod hash_value;
 mod hashed;