diff --git a/Cargo.lock b/Cargo.lock
index ce92ef1..1eb40ba 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -190,6 +190,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "build-env"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1522ac6ee801a11bf9ef3f80403f4ede6eb41291fac3dde3de09989679305f25"
+
 [[package]]
 name = "bumpalo"
 version = "3.11.1"
@@ -214,6 +220,7 @@ dependencies = [
  "serde_json",
  "serde_yaml",
  "sigh",
+ "systemd",
  "thiserror",
  "tokio",
  "tokio-postgres",
@@ -305,6 +312,16 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "cstr-argument"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6bd9c8e659a473bce955ae5c35b116af38af11a7acb0b480e01f3ed348aeb40"
+dependencies = [
+ "cfg-if",
+ "memchr",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.83"
@@ -407,7 +424,28 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 dependencies = [
- "foreign-types-shared",
+ "foreign-types-shared 0.1.1",
+]
+
+[[package]]
+name = "foreign-types"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d737d9aa519fb7b749cbc3b962edcf310a8dd1f4b67c91c4f83975dbdd17d965"
+dependencies = [
+ "foreign-types-macros",
+ "foreign-types-shared 0.3.1",
+]
+
+[[package]]
+name = "foreign-types-macros"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8469d0d40519bc608ec6863f1cc88f3f1deee15913f2f3b3e573d81ed38cccc"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -416,6 +454,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 
+[[package]]
+name = "foreign-types-shared"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
+
 [[package]]
 name = "form_urlencoded"
 version = "1.1.0"
@@ -765,6 +809,17 @@ version = "0.2.138"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "db6d7e329c562c5dfab7a46a2afabc8b987ab9a4834c9d1ca04dc54c1546cef8"
 
+[[package]]
+name = "libsystemd-sys"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed080163caa59cc29b34bce2209b737149a4bac148cd9a8b04e4c12822798119"
+dependencies = [
+ "build-env",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "link-cplusplus"
 version = "1.0.7"
@@ -938,7 +993,7 @@ checksum = "29d971fd5722fec23977260f6e81aa67d2f22cadbdc2aa049f1022d9a3be1566"
 dependencies = [
  "bitflags",
  "cfg-if",
- "foreign-types",
+ "foreign-types 0.3.2",
  "libc",
  "once_cell",
  "openssl-macros",
@@ -1457,6 +1512,21 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20518fe4a4c9acf048008599e464deb21beeae3d3578418951a189c235a7a9a8"
 
+[[package]]
+name = "systemd"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afec0101d9ae8ab26aedf0840109df689938ea7e538aa03df4369f1854f11562"
+dependencies = [
+ "cstr-argument",
+ "foreign-types 0.5.0",
+ "libc",
+ "libsystemd-sys",
+ "log",
+ "memchr",
+ "utf8-cstr",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.3.0"
@@ -1804,6 +1874,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "utf8-cstr"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55bcbb425141152b10d5693095950b51c3745d019363fc2929ffd8f61449b628"
+
 [[package]]
 name = "valuable"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index a959c14..ace1d14 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,3 +23,4 @@ chrono = "0.4"
 eventsource-stream = "0.2"
 futures = "0.3"
 tokio-postgres = "0.7"
+systemd = "0.10"
diff --git a/src/main.rs b/src/main.rs
index 13dc25f..75a9f40 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -255,10 +255,13 @@ async fn main() {
         });
 
     let addr = SocketAddr::from(([127, 0, 0, 1], config.listen_port));
+    let server = axum::Server::bind(&addr)
+        .serve(app.into_make_service());
+
     tracing::info!("serving on {}", addr);
-    axum::Server::bind(&addr)
-        .serve(app.into_make_service())
-        .await
+    systemd::daemon::notify(false, [(systemd::daemon::STATE_READY, "1")].iter())
+        .unwrap();
+    server.await
         .unwrap();
 }
 
diff --git a/src/relay.rs b/src/relay.rs
index 38f15b0..b162b3b 100644
--- a/src/relay.rs
+++ b/src/relay.rs
@@ -122,6 +122,13 @@ pub fn spawn(
                             &key_id, &private_key_, body_
                         ).await {
                             tracing::error!("relay::send {:?}", e);
+                        } else {
+                            // success
+                            systemd::daemon::notify(
+                                false, [
+                                    (systemd::daemon::STATE_WATCHDOG, "1")
+                                ].iter()
+                            ).unwrap();
                         }
                     });
                 }