diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 7f466bd2..bbf217f2 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.80.1"
+channel = "1.81.0"
 profile = "default"
diff --git a/src/lib.rs b/src/lib.rs
index e9e9e7ff..e6cb2246 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1288,8 +1288,9 @@ impl<Fs: FileSystem> ResolverGeneric<Fs> {
             let mut has_dot = false;
             let mut without_dot = false;
             for key in map.keys() {
-                has_dot = has_dot || key.starts_with(|s| s == '.' || s == '#');
-                without_dot = without_dot || !key.starts_with(|s| s == '.' || s == '#');
+                let starts_with_dot_or_hash = key.starts_with(['.', '#']);
+                has_dot = has_dot || starts_with_dot_or_hash;
+                without_dot = without_dot || !starts_with_dot_or_hash;
                 if has_dot && without_dot {
                     return Err(ResolveError::InvalidPackageConfig(
                         package_url.join("package.json"),
diff --git a/src/tsconfig.rs b/src/tsconfig.rs
index 0de8e8ec..6a675442 100644
--- a/src/tsconfig.rs
+++ b/src/tsconfig.rs
@@ -146,7 +146,7 @@ impl TsConfig {
     // Copied from parcel
     // <https://github.com/parcel-bundler/parcel/blob/b6224fd519f95e68d8b93ba90376fd94c8b76e69/packages/utils/node-resolver-rs/src/tsconfig.rs#L93>
     pub fn resolve_path_alias(&self, specifier: &str) -> Vec<PathBuf> {
-        if specifier.starts_with(|s| s == '/' || s == '.') {
+        if specifier.starts_with(['/', '.']) {
             return vec![];
         }