diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f24b7552a..0db2937e6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,7 +11,7 @@ When reporting an issue, in order to help the maintainers understand what the pr
 
 When making a code contribution to AccessKit, before opening your pull request please make sure that:
 
-- your patch builds with AccessKit's minimal supported Rust version (currently Rust 1.85)
+- your patch builds with AccessKit's minimal supported Rust version (currently Rust 1.87)
 - you added tests where applicable
 - you tested your modifications on all impacted platforms (see below)
 - you updated any relevant documentation
diff --git a/Cargo.toml b/Cargo.toml
index 836898309..327918112 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ categories = ["gui"]
 edition = "2024"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/AccessKit/accesskit"
-rust-version = "1.85"
+rust-version = "1.87"
 
 [workspace.dependencies]
 hashbrown = { version = "0.17", default-features = false, features = ["default-hasher"] }
diff --git a/adapters/windows/src/util.rs b/adapters/windows/src/util.rs
index b6e4d36f3..45b1d4705 100644
--- a/adapters/windows/src/util.rs
+++ b/adapters/windows/src/util.rs
@@ -109,7 +109,7 @@ pub(crate) struct LocaleName<'a>(pub(crate) &'a str);
 impl From<LocaleName<'_>> for Variant {
     fn from(value: LocaleName) -> Self {
         let lcid = unsafe { LocaleNameToLCID(&HSTRING::from(value.0), LOCALE_ALLOW_NEUTRAL_NAMES) };
-        (lcid != 0).then_some(lcid as i32).into()
+        (lcid != 0).then_some(lcid.cast_signed()).into()
     }
 }