diff --git a/HACKING.md b/HACKING.md
index fed30b2c2e42..38a08fbf850d 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-2024-10-13
-cargo +nightly-2024-10-13 install --git https://github.com/facebook/buck2.git buck2
+rustup install nightly-2024-11-22
+cargo +nightly-2024-11-22 install --git https://github.com/facebook/buck2.git buck2
 ```
 
 ### Side note: using [Nix] to compile the source
diff --git a/app/buck2_execute/src/re/client.rs b/app/buck2_execute/src/re/client.rs
index 720390d64a7c..62c22f33c72b 100644
--- a/app/buck2_execute/src/re/client.rs
+++ b/app/buck2_execute/src/re/client.rs
@@ -1485,7 +1485,8 @@ mod tests {
         let v = vec![1, 2, 3];
         let addr = v.as_ptr() as usize;
         let mut it = chunks(v, 3);
-        assert_eq!(it.next().unwrap().as_ptr() as usize, addr);
+        let first = it.next().unwrap();
+        assert_eq!(first.as_ptr() as usize, addr);
         assert_eq!(it.next(), None);
     }
 
diff --git a/app/buck2_futures/src/lib.rs b/app/buck2_futures/src/lib.rs
index cfaa394bdf91..d863748ea174 100644
--- a/app/buck2_futures/src/lib.rs
+++ b/app/buck2_futures/src/lib.rs
@@ -8,7 +8,6 @@
  */
 
 #![feature(assert_matches)]
-#![feature(pin_deref_mut)]
 
 pub mod cancellation;
 mod details;
diff --git a/docs/about/getting_started.md b/docs/about/getting_started.md
index e24ba1abd10f..644b784d3ebd 100644
--- a/docs/about/getting_started.md
+++ b/docs/about/getting_started.md
@@ -20,8 +20,8 @@ To get started, first install [rustup](https://rustup.rs/), then compile the
 `buck2` executable:
 
 ```bash
-rustup install nightly-2024-10-13
-cargo +nightly-2024-10-13 install --git https://github.com/facebook/buck2.git buck2
+rustup install nightly-2024-11-22
+cargo +nightly-2024-11-22 install --git https://github.com/facebook/buck2.git buck2
 ```
 
 The above commands install `buck2` into a suitable directory, such as
diff --git a/lint_levels.bzl b/lint_levels.bzl
index 2437f87a83cf..ccd94d8c9b0b 100644
--- a/lint_levels.bzl
+++ b/lint_levels.bzl
@@ -21,6 +21,7 @@ CLIPPY_ALLOW = [
     "clippy::derive_partial_eq_without_eq",  # In generated protobuf code
     "clippy::disallowed_names",  # Not using foo, bar, baz in test data is silly
     "clippy::enum_variant_names",  # Sometimes you do want the same prefixes
+    "clippy::extra_unused_lifetimes",  # FIXME new in Rust 1.84
     "clippy::from_iter_instead_of_collect",  # https://fb.workplace.com/groups/buck2core/posts/835300915330313
     "clippy::implicit_hasher",  # Makes code more complex for little benefit
     "clippy::len_without_is_empty",  # len() == 0 is perfectly clear
@@ -34,6 +35,7 @@ CLIPPY_ALLOW = [
     "clippy::mut_from_ref",  # Tries to check soundness, which Rust already does
     "clippy::mutable_key_type",  # FIXME new in Rust 1.80
     "clippy::naive_bytecount",  # Requires an extra dependency for marginal gains.
+    "clippy::needless_as_bytes",  # FIXME new in Rust 1.84
     "clippy::needless_borrows_for_generic_args",  # FIXME new in Rust 1.74
     "clippy::needless_collect",  # False positives: doesn't understand lifetimes, or e.g. DoubleEndedIterator.
     "clippy::needless_lifetimes",  # This is throwing false positives
@@ -48,6 +50,7 @@ CLIPPY_ALLOW = [
     "clippy::too_many_arguments",  # This is an arbitrary limit set on number of arguments and not always useful
     "clippy::type_complexity",  # This is an arbitrary limit set on number of type parameterizations and not always useful
     "clippy::unconditional_recursion",  # FIXME new in Rust 1.77.1
+    "clippy::unnecessary_map_or",  # FIXME new in Rust 1.84
     "clippy::unnecessary_wraps",  # Sometimes unnecessary wraps provide the right API
     "clippy::unwrap_or_default",  # Defaults aren't always more clear as it removes the type information when reading code
     "clippy::useless_conversion",  # Removed all obvious but there are some reports I'm unclear how to fix
diff --git a/rust-toolchain b/rust-toolchain
index 96935d247bff..346c6e3596bd 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -10,6 +10,6 @@
 #   * NOTE: You may have to change this ocaml file in a follow up commit as ocamlrep
 #     has a dependency on buck2 git trunk.
 
-# @rustc_version: rustc 1.83.0-nightly (6b9676b45 2024-10-12)
-channel = "nightly-2024-10-13"
+# @rustc_version: rustc 1.84.0-nightly (b19329a37 2024-11-21)
+channel = "nightly-2024-11-22"
 components = ["llvm-tools-preview","rustc-dev","rust-src"]