diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index ca2b2795b..f78ef2f0a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -3,5 +3,5 @@
 # nightly-only. The dated pin keeps builds reproducible; see
 # docs/adr-006-adopt-polonius-nightly-toolchain.md before changing the channel.
 [toolchain]
-channel = "nightly-2026-08-23"
+channel = "nightly-2026-09-04"
 components = ["rustfmt", "clippy", "rust-analyzer"]