diff --git a/crates/caldav/src/error.rs b/crates/caldav/src/error.rs
index 8dd3d90..750f91a 100644
--- a/crates/caldav/src/error.rs
+++ b/crates/caldav/src/error.rs
@@ -17,7 +17,7 @@ pub enum Precondition {
 impl IntoResponse for Precondition {
     fn into_response(self) -> axum::response::Response {
         let mut output: Vec<_> = b"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n".into();
-        let mut writer = quick_xml::Writer::new_with_indent(output.as_mut_slice(), b' ', 4);
+        let mut writer = quick_xml::Writer::new_with_indent(&mut output, b' ', 4);
 
         let error = rustical_dav::xml::ErrorElement(&self);
         if let Err(err) = error.serialize_root(&mut writer) {
diff --git a/crates/dav/src/privileges.rs b/crates/dav/src/privileges.rs
index 9253cd8..7f2536d 100644
--- a/crates/dav/src/privileges.rs
+++ b/crates/dav/src/privileges.rs
@@ -21,7 +21,7 @@ impl XmlSerialize for UserPrivilegeSet {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         #[derive(XmlSerialize)]
         pub struct FakeUserPrivilegeSet {
diff --git a/crates/dav/src/xml/multistatus.rs b/crates/dav/src/xml/multistatus.rs
index 9c7cb75..0f224af 100644
--- a/crates/dav/src/xml/multistatus.rs
+++ b/crates/dav/src/xml/multistatus.rs
@@ -24,7 +24,7 @@ fn xml_serialize_status(
     ns: Option<Namespace>,
     tag: Option<&[u8]>,
     namespaces: &HashMap<Namespace, &[u8]>,
-    writer: &mut quick_xml::Writer<&mut [u8]>,
+    writer: &mut quick_xml::Writer<&mut Vec<u8>>,
 ) -> std::io::Result<()> {
     XmlSerialize::serialize(&format!("HTTP/1.1 {}", status), ns, tag, namespaces, writer)
 }
@@ -54,7 +54,7 @@ fn xml_serialize_optional_status(
     ns: Option<Namespace>,
     tag: Option<&[u8]>,
     namespaces: &HashMap<Namespace, &[u8]>,
-    writer: &mut quick_xml::Writer<&mut [u8]>,
+    writer: &mut quick_xml::Writer<&mut Vec<u8>>,
 ) -> std::io::Result<()> {
     XmlSerialize::serialize(
         &val.map(|status| format!("HTTP/1.1 {}", status)),
diff --git a/crates/dav/src/xml/tag_list.rs b/crates/dav/src/xml/tag_list.rs
index 3010bb4..0c5ca23 100644
--- a/crates/dav/src/xml/tag_list.rs
+++ b/crates/dav/src/xml/tag_list.rs
@@ -15,7 +15,7 @@ impl XmlSerialize for TagList {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         let prefix = ns
             .map(|ns| namespaces.get(&ns))
diff --git a/crates/xml/derive/src/xml_enum/impl_se.rs b/crates/xml/derive/src/xml_enum/impl_se.rs
index c198fba..aa3d186 100644
--- a/crates/xml/derive/src/xml_enum/impl_se.rs
+++ b/crates/xml/derive/src/xml_enum/impl_se.rs
@@ -18,7 +18,7 @@ impl Enum {
                     ns: Option<::quick_xml::name::Namespace>,
                     tag: Option<&[u8]>,
                     namespaces: &::std::collections::HashMap<::quick_xml::name::Namespace, &[u8]>,
-                    writer: &mut ::quick_xml::Writer<&mut [u8]>
+                    writer: &mut ::quick_xml::Writer<&mut Vec<u8>>
                 ) -> ::std::io::Result<()> {
                     use ::quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
 
diff --git a/crates/xml/derive/src/xml_struct/impl_se.rs b/crates/xml/derive/src/xml_struct/impl_se.rs
index 2b833eb..0df2bf6 100644
--- a/crates/xml/derive/src/xml_struct/impl_se.rs
+++ b/crates/xml/derive/src/xml_struct/impl_se.rs
@@ -93,7 +93,7 @@ impl NamedStruct {
                     ns: Option<::quick_xml::name::Namespace>,
                     tag: Option<&[u8]>,
                     namespaces: &::std::collections::HashMap<::quick_xml::name::Namespace, &[u8]>,
-                    writer: &mut ::quick_xml::Writer<&mut [u8]>
+                    writer: &mut ::quick_xml::Writer<&mut Vec<u8>>
                 ) -> ::std::io::Result<()> {
                     use ::quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
 
diff --git a/crates/xml/src/se.rs b/crates/xml/src/se.rs
index f8142c8..da3faab 100644
--- a/crates/xml/src/se.rs
+++ b/crates/xml/src/se.rs
@@ -12,7 +12,7 @@ pub trait XmlSerialize {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()>;
 
     fn attributes<'a>(&self) -> Option<Vec<Attribute<'a>>>;
@@ -24,7 +24,7 @@ impl<T: XmlSerialize> XmlSerialize for Option<T> {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         if let Some(some) = self {
             some.serialize(ns, tag, namespaces, writer)
@@ -39,18 +39,18 @@ impl<T: XmlSerialize> XmlSerialize for Option<T> {
 }
 
 pub trait XmlSerializeRoot {
-    fn serialize_root(&self, writer: &mut quick_xml::Writer<&mut [u8]>) -> std::io::Result<()>;
+    fn serialize_root(&self, writer: &mut quick_xml::Writer<&mut Vec<u8>>) -> std::io::Result<()>;
 
     fn serialize_to_string(&self) -> std::io::Result<String> {
         let mut buf: Vec<_> = b"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n".into();
-        let mut writer = quick_xml::Writer::new(buf.as_mut_slice());
+        let mut writer = quick_xml::Writer::new(&mut buf);
         self.serialize_root(&mut writer)?;
         Ok(String::from_utf8_lossy(&buf).to_string())
     }
 }
 
 impl<T: XmlSerialize + XmlRootTag> XmlSerializeRoot for T {
-    fn serialize_root(&self, writer: &mut quick_xml::Writer<&mut [u8]>) -> std::io::Result<()> {
+    fn serialize_root(&self, writer: &mut quick_xml::Writer<&mut Vec<u8>>) -> std::io::Result<()> {
         let namespaces = Self::root_ns_prefixes();
         self.serialize(Self::root_ns(), Some(Self::root_tag()), &namespaces, writer)
     }
@@ -62,7 +62,7 @@ impl XmlSerialize for () {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         let prefix = ns
             .map(|ns| namespaces.get(&ns))
diff --git a/crates/xml/src/value.rs b/crates/xml/src/value.rs
index 5e18266..5914eff 100644
--- a/crates/xml/src/value.rs
+++ b/crates/xml/src/value.rs
@@ -109,7 +109,7 @@ impl<T: ValueSerialize> XmlSerialize for T {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut quick_xml::Writer<&mut [u8]>,
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         let prefix = ns
             .map(|ns| namespaces.get(&ns))
diff --git a/crates/xml/tests/se_struct.rs b/crates/xml/tests/se_struct.rs
index c0d696d..a8c600c 100644
--- a/crates/xml/tests/se_struct.rs
+++ b/crates/xml/tests/se_struct.rs
@@ -129,7 +129,7 @@ fn test_struct_serialize_with() {
         ns: Option<Namespace>,
         tag: Option<&[u8]>,
         namespaces: &HashMap<Namespace, &[u8]>,
-        writer: &mut Writer<&mut [u8]>,
+        writer: &mut Writer<&mut Vec<u8>>,
     ) -> std::io::Result<()> {
         val.to_uppercase().serialize(ns, tag, namespaces, writer)
     }