diff --git a/Cargo.toml b/Cargo.toml
index c4b3d64d..37d4d7ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ macro_use_extern_crate = "warn"
 missing_abi = "warn"
 noop_method_call = "warn"
 pointer_structural_match = "warn"
+single_use_lifetimes = "warn"
 unreachable_pub = "warn"
 unsafe_op_in_unsafe_fn = "warn"
 unused_extern_crates = "warn"
diff --git a/src/database/key_value/rooms/state_cache.rs b/src/database/key_value/rooms/state_cache.rs
index 49e3842b..6cb7a8c6 100644
--- a/src/database/key_value/rooms/state_cache.rs
+++ b/src/database/key_value/rooms/state_cache.rs
@@ -264,7 +264,7 @@ impl service::rooms::state_cache::Data for KeyValueDatabase {
     }
 
     #[tracing::instrument(skip(self))]
-    fn server_in_room<'a>(&'a self, server: &ServerName, room_id: &RoomId) -> Result<bool> {
+    fn server_in_room(&self, server: &ServerName, room_id: &RoomId) -> Result<bool> {
         let mut key = server.as_bytes().to_vec();
         key.push(0xff);
         key.extend_from_slice(room_id.as_bytes());
diff --git a/src/service/rooms/state_cache.rs b/src/service/rooms/state_cache.rs
index 8b844f1e..78aba47b 100644
--- a/src/service/rooms/state_cache.rs
+++ b/src/service/rooms/state_cache.rs
@@ -226,11 +226,7 @@ impl Service {
     }
 
     #[tracing::instrument(skip(self))]
-    pub(crate) fn server_in_room<'a>(
-        &'a self,
-        server: &ServerName,
-        room_id: &RoomId,
-    ) -> Result<bool> {
+    pub(crate) fn server_in_room(&self, server: &ServerName, room_id: &RoomId) -> Result<bool> {
         self.db.server_in_room(server, room_id)
     }
 
diff --git a/src/utils.rs b/src/utils.rs
index a38a3fc6..b679e6b6 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -128,9 +128,7 @@ pub(crate) fn deserialize_from_str<
     deserializer: D,
 ) -> Result<T, D::Error> {
     struct Visitor<T: FromStr<Err = E>, E>(std::marker::PhantomData<T>);
-    impl<'de, T: FromStr<Err = Err>, Err: std::fmt::Display> serde::de::Visitor<'de>
-        for Visitor<T, Err>
-    {
+    impl<T: FromStr<Err = Err>, Err: std::fmt::Display> serde::de::Visitor<'_> for Visitor<T, Err> {
         type Value = T;
         fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
             write!(formatter, "a parsable string")
@@ -152,7 +150,7 @@ pub(crate) fn deserialize_from_str<
 /// string when passed to a format string.
 pub(crate) struct HtmlEscape<'a>(pub(crate) &'a str);
 
-impl<'a> fmt::Display for HtmlEscape<'a> {
+impl fmt::Display for HtmlEscape<'_> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         // Because the internet is always right, turns out there's not that many
         // characters to escape: http://stackoverflow.com/questions/7381974