diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index c3757e8..0238a53 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
 # We choose a specific toolchain (rather than "stable") for repeatability.  The
 # intent is to keep this up-to-date with recently-released stable Rust.
-channel = "1.86.0"
+channel = "1.91.1"
 profile = "default"