diff --git a/crates/caldav/src/lib.rs b/crates/caldav/src/lib.rs
index 5c86a15..b574300 100644
--- a/crates/caldav/src/lib.rs
+++ b/crates/caldav/src/lib.rs
@@ -48,7 +48,7 @@ pub fn caldav_service<
                                 HeaderName::from_static("dav"),
                                 // https://datatracker.ietf.org/doc/html/rfc4918#section-18
                                 HeaderValue::from_static(
-                                    "1, 3, access-control, calendar-access, extended-mkcol, calendar-no-timezone",
+                                    "1, 3, access-control, calendar-access, extended-mkcol, calendar-no-timezone, webdav-push",
                                 ),
                             ));
 
diff --git a/crates/carddav/src/lib.rs b/crates/carddav/src/lib.rs
index 0fa1b48..f4adc46 100644
--- a/crates/carddav/src/lib.rs
+++ b/crates/carddav/src/lib.rs
@@ -41,7 +41,7 @@ pub fn carddav_service<AP: AuthenticationProvider, A: AddressbookStore, S: Subsc
                             HeaderName::from_static("dav"),
                             // https://datatracker.ietf.org/doc/html/rfc4918#section-18
                             HeaderValue::from_static(
-                                "1, 3, access-control, addressbook, extended-mkcol",
+                                "1, 3, access-control, addressbook, extended-mkcol, webdav-push",
                             ),
                         ));
 
diff --git a/crates/dav/src/header/depth.rs b/crates/dav/src/header/depth.rs
index a30026f..e8d7219 100644
--- a/crates/dav/src/header/depth.rs
+++ b/crates/dav/src/header/depth.rs
@@ -1,5 +1,6 @@
-use actix_web::{http::StatusCode, FromRequest, HttpRequest, ResponseError};
-use futures_util::future::{err, ok, Ready};
+use actix_web::{FromRequest, HttpRequest, ResponseError, http::StatusCode};
+use futures_util::future::{Ready, err, ok};
+use rustical_xml::ValueSerialize;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -12,13 +13,24 @@ impl ResponseError for InvalidDepthHeader {
     }
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, Clone, PartialEq)]
 pub enum Depth {
     Zero,
     One,
     Infinity,
 }
 
+impl ValueSerialize for Depth {
+    fn serialize(&self) -> String {
+        match self {
+            Depth::Zero => "0",
+            Depth::One => "1",
+            Depth::Infinity => "Infinity",
+        }
+        .to_owned()
+    }
+}
+
 impl TryFrom<&[u8]> for Depth {
     type Error = InvalidDepthHeader;
 
diff --git a/crates/dav_push/src/extension.rs b/crates/dav_push/src/extension.rs
index 988e869..2b0d28e 100644
--- a/crates/dav_push/src/extension.rs
+++ b/crates/dav_push/src/extension.rs
@@ -1,4 +1,5 @@
-use crate::Transports;
+use crate::{ContentUpdate, PropertyUpdate, SupportedTrigger, SupportedTriggers, Transports};
+use rustical_dav::header::Depth;
 use rustical_xml::{EnumUnitVariants, EnumVariants, XmlDeserialize, XmlSerialize};
 
 #[derive(XmlDeserialize, XmlSerialize, PartialEq, Clone, EnumUnitVariants, EnumVariants)]
@@ -10,11 +11,21 @@ pub enum DavPushExtensionProp {
     Transports(Transports),
     #[xml(ns = "rustical_dav::namespace::NS_DAVPUSH")]
     Topic(String),
+    #[xml(skip_deserializing)]
+    #[xml(ns = "rustical_dav::namespace::NS_DAVPUSH")]
+    SupportedTriggers(SupportedTriggers),
 }
 
 pub trait DavPushExtension {
     fn get_topic(&self) -> String;
 
+    fn supported_triggers(&self) -> SupportedTriggers {
+        SupportedTriggers(vec![
+            SupportedTrigger::ContentUpdate(ContentUpdate(Depth::One)),
+            SupportedTrigger::PropertyUpdate(PropertyUpdate(Depth::One)),
+        ])
+    }
+
     fn get_prop(
         &self,
         prop: &DavPushExtensionPropName,
@@ -24,6 +35,9 @@ pub trait DavPushExtension {
                 DavPushExtensionProp::Transports(Default::default())
             }
             DavPushExtensionPropName::Topic => DavPushExtensionProp::Topic(self.get_topic()),
+            DavPushExtensionPropName::SupportedTriggers => {
+                DavPushExtensionProp::SupportedTriggers(self.supported_triggers())
+            }
         })
     }
 
diff --git a/crates/dav_push/src/prop.rs b/crates/dav_push/src/prop.rs
index 5a3ea2a..f596562 100644
--- a/crates/dav_push/src/prop.rs
+++ b/crates/dav_push/src/prop.rs
@@ -1,3 +1,4 @@
+use rustical_dav::header::Depth;
 use rustical_xml::XmlSerialize;
 
 #[derive(Debug, Clone, XmlSerialize, PartialEq)]
@@ -20,3 +21,24 @@ impl Default for Transports {
         }
     }
 }
+
+#[derive(XmlSerialize, PartialEq, Clone)]
+pub struct SupportedTriggers(#[xml(flatten, ty = "untagged")] pub Vec<SupportedTrigger>);
+
+#[derive(XmlSerialize, PartialEq, Clone)]
+pub enum SupportedTrigger {
+    #[xml(ns = "rustical_dav::namespace::NS_DAVPUSH")]
+    ContentUpdate(ContentUpdate),
+    #[xml(ns = "rustical_dav::namespace::NS_DAVPUSH")]
+    PropertyUpdate(PropertyUpdate),
+}
+
+#[derive(XmlSerialize, PartialEq, Clone)]
+pub struct ContentUpdate(
+    #[xml(rename = b"depth", ns = "rustical_dav::namespace::NS_DAV")] pub Depth,
+);
+
+#[derive(XmlSerialize, PartialEq, Clone)]
+pub struct PropertyUpdate(
+    #[xml(rename = b"depth", ns = "rustical_dav::namespace::NS_DAV")] pub Depth,
+);