diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 08b9c702..bcdf2ad3 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -14,7 +14,7 @@ repository = "https://github.com/watchexec/watchexec"
 readme = "README.md"
 
 rust-version = "1.56.0"
-edition = "2018"
+edition = "2021"
 
 [[bin]]
 name = "watchexec"
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 0c5952ca..b460c7f8 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -13,7 +13,7 @@ repository = "https://github.com/watchexec/watchexec"
 readme = "README.md"
 
 rust-version = "1.56.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 async-recursion = "0.3.2"
diff --git a/lib/src/project.rs b/lib/src/project.rs
index c8a17086..c6e48369 100644
--- a/lib/src/project.rs
+++ b/lib/src/project.rs
@@ -119,7 +119,7 @@ pub async fn origins(path: impl AsRef<Path>) -> HashSet<PathBuf> {
 			return false;
 		}
 
-		IntoIterator::into_iter([
+		[
 			list.has_dir("_darcs"),
 			list.has_dir(".bzr"),
 			list.has_dir(".fossil-settings"),
@@ -165,7 +165,8 @@ pub async fn origins(path: impl AsRef<Path>) -> HashSet<PathBuf> {
 			list.has_file("README"),
 			list.has_file("requirements.txt"),
 			list.has_file("v.mod"),
-		])
+		]
+		.into_iter()
 		.any(|f| f)
 	}
 
@@ -196,7 +197,7 @@ pub async fn origins(path: impl AsRef<Path>) -> HashSet<PathBuf> {
 /// anything for some paths returned by [`origins()`].
 pub async fn types(path: impl AsRef<Path>) -> HashSet<ProjectType> {
 	let list = DirList::obtain(path.as_ref()).await;
-	IntoIterator::into_iter([
+	[
 		list.if_has_dir("_darcs", ProjectType::Darcs),
 		list.if_has_dir(".bzr", ProjectType::Bazaar),
 		list.if_has_dir(".fossil-settings", ProjectType::Fossil),
@@ -222,7 +223,8 @@ pub async fn types(path: impl AsRef<Path>) -> HashSet<ProjectType> {
 		list.if_has_file("project.clj", ProjectType::Leiningen),
 		list.if_has_file("requirements.txt", ProjectType::Pip),
 		list.if_has_file("v.mod", ProjectType::V),
-	])
+	]
+	.into_iter()
 	.flatten()
 	.collect()
 }
diff --git a/lib/src/signal/process.rs b/lib/src/signal/process.rs
index 632d49fa..f1843701 100644
--- a/lib/src/signal/process.rs
+++ b/lib/src/signal/process.rs
@@ -115,8 +115,6 @@ impl SubSignal {
 	/// [`Custom`][SubSignal::Custom], as the first-class ones are always supported).
 	#[cfg(unix)]
 	pub fn to_nix(self) -> Option<NixSignal> {
-		use std::convert::TryFrom;
-
 		match self {
 			Self::Hangup => Some(NixSignal::SIGHUP),
 			Self::ForceStop => Some(NixSignal::SIGKILL),
@@ -181,8 +179,6 @@ impl FromStr for SubSignal {
 
 	#[cfg(unix)]
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
-		use std::convert::TryFrom;
-
 		if let Ok(sig) = i32::from_str(s) {
 			if let Ok(sig) = NixSignal::try_from(sig) {
 				return Ok(Self::from_nix(sig));