diff --git a/actix-rt/CHANGES.md b/actix-rt/CHANGES.md
index 05bc8e36..98841887 100644
--- a/actix-rt/CHANGES.md
+++ b/actix-rt/CHANGES.md
@@ -4,6 +4,7 @@
 
 ## 2.10.0
 
+- Relax bound (`F: Fn -> FnOnce`) on `{Arbiter, System}::with_tokio_rt()` functions.
 - Update `tokio-uring` dependency to `0.5`.
 - Minimum supported Rust version (MSRV) is now 1.70.
 
diff --git a/actix-rt/src/arbiter.rs b/actix-rt/src/arbiter.rs
index ee647aef..1da76c52 100644
--- a/actix-rt/src/arbiter.rs
+++ b/actix-rt/src/arbiter.rs
@@ -109,7 +109,7 @@ impl Arbiter {
     #[cfg(not(all(target_os = "linux", feature = "io-uring")))]
     pub fn with_tokio_rt<F>(runtime_factory: F) -> Arbiter
     where
-        F: Fn() -> tokio::runtime::Runtime + Send + 'static,
+        F: FnOnce() -> tokio::runtime::Runtime + Send + 'static,
     {
         let sys = System::current();
         let system_id = sys.id();
diff --git a/actix-rt/src/system.rs b/actix-rt/src/system.rs
index 367a2d21..f9fe4c8d 100644
--- a/actix-rt/src/system.rs
+++ b/actix-rt/src/system.rs
@@ -48,7 +48,7 @@ impl System {
     /// [tokio-runtime]: tokio::runtime::Runtime
     pub fn with_tokio_rt<F>(runtime_factory: F) -> SystemRunner
     where
-        F: Fn() -> tokio::runtime::Runtime,
+        F: FnOnce() -> tokio::runtime::Runtime,
     {
         let (stop_tx, stop_rx) = oneshot::channel();
         let (sys_tx, sys_rx) = mpsc::unbounded_channel();
@@ -87,7 +87,7 @@ impl System {
     #[doc(hidden)]
     pub fn with_tokio_rt<F>(_: F) -> SystemRunner
     where
-        F: Fn() -> tokio::runtime::Runtime,
+        F: FnOnce() -> tokio::runtime::Runtime,
     {
         unimplemented!("System::with_tokio_rt is not implemented for io-uring feature yet")
     }
diff --git a/justfile b/justfile
index ae80165b..e7a7978a 100644
--- a/justfile
+++ b/justfile
@@ -27,6 +27,10 @@ all_crate_features := if os() == "linux" {
     "--features='" + non_linux_all_features_list + "'"
 }
 
+# Run Clippy over workspace.
+clippy toolchain="":
+    cargo {{ toolchain }} clippy --workspace --all-targets {{ all_crate_features }}
+
 # Test workspace code.
 [macos, windows]
 test toolchain="":