diff --git a/Cargo.toml b/Cargo.toml
index 0e61525..804187b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,11 @@ once_cell = "1.4.1"
 
 [target.'cfg(unix)'.dependencies]
 async-io = "1.0.0"
-signal-hook = { version = "0.1.16", default-features = false }
+
+[target.'cfg(unix)'.dependencies.signal-hook]
+version = "0.3.0"
+features = ["iterator"]
+default-features = false
 
 [target.'cfg(windows)'.dependencies]
 blocking = "1.0.0"
diff --git a/src/lib.rs b/src/lib.rs
index c6017d8..2adbf17 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -186,9 +186,11 @@ impl Child {
                 }
 
             } else if #[cfg(unix)] {
-                static SIGNALS: Lazy<signal_hook::iterator::Signals> = Lazy::new(|| {
-                    signal_hook::iterator::Signals::new(&[signal_hook::SIGCHLD])
-                        .expect("cannot set signal handler for SIGCHLD")
+                static SIGNALS: Lazy<Mutex<signal_hook::iterator::Signals>> = Lazy::new(|| {
+                    Mutex::new(
+                        signal_hook::iterator::Signals::new(&[signal_hook::consts::SIGCHLD])
+                            .expect("cannot set signal handler for SIGCHLD"),
+                    )
                 });
 
                 // Make sure the signal handler is registered before interacting with the process.
@@ -196,7 +198,7 @@ impl Child {
 
                 // Waits for the next SIGCHLD signal.
                 fn wait_sigchld() {
-                    SIGNALS.forever().next();
+                    SIGNALS.lock().unwrap().forever().next();
                 }
 
                 // Wraps a sync I/O type into an async I/O type.