diff --git a/chronik/chronik-db/src/group.rs b/chronik/chronik-db/src/group.rs
--- a/chronik/chronik-db/src/group.rs
+++ b/chronik/chronik-db/src/group.rs
@@ -54,7 +54,7 @@
     /// time we compare/hash elements for grouping.
     ///
     /// Note: For group history, this will be suffixed by a 4-byte page number.
-    type MemberSer<'a>: AsRef<[u8]> + 'a;
+    type MemberSer: AsRef<[u8]>;
 
     /// Auxillary data when grouping members
     type Aux;
@@ -85,7 +85,7 @@
     ) -> Self::Iter<'a>;
 
     /// Serialize the given member.
-    fn ser_member<'a>(&self, member: &Self::Member<'a>) -> Self::MemberSer<'a>;
+    fn ser_member(&self, member: &Self::Member<'_>) -> Self::MemberSer;
 
     /// The [`GroupHistoryConf`] for this group.
     fn tx_history_conf() -> GroupHistoryConf;
diff --git a/chronik/chronik-db/src/groups/script.rs b/chronik/chronik-db/src/groups/script.rs
--- a/chronik/chronik-db/src/groups/script.rs
+++ b/chronik/chronik-db/src/groups/script.rs
@@ -68,7 +68,7 @@
     type Aux = ();
     type Iter<'a> = ScriptGroupIter<'a>;
     type Member<'a> = &'a Script;
-    type MemberSer<'a> = Bytes;
+    type MemberSer = Bytes;
     type UtxoData = UtxoDataValue;
 
     fn input_members<'a>(
@@ -97,7 +97,7 @@
         }
     }
 
-    fn ser_member<'a>(&self, member: &Self::Member<'a>) -> Self::MemberSer<'a> {
+    fn ser_member(&self, member: &Self::Member<'_>) -> Self::MemberSer {
         compress_script_variant(&member.variant())
     }
 
diff --git a/chronik/chronik-db/src/groups/token_id.rs b/chronik/chronik-db/src/groups/token_id.rs
--- a/chronik/chronik-db/src/groups/token_id.rs
+++ b/chronik/chronik-db/src/groups/token_id.rs
@@ -51,7 +51,7 @@
     type Aux = TokenIdGroupAux;
     type Iter<'a> = Vec<MemberItem<TokenId>>;
     type Member<'a> = TokenId;
-    type MemberSer<'a> = [u8; 32];
+    type MemberSer = [u8; 32];
     type UtxoData = UtxoDataOutput;
 
     fn input_members<'a>(
@@ -99,7 +99,7 @@
         output_scripts
     }
 
-    fn ser_member<'a>(&self, member: &Self::Member<'a>) -> Self::MemberSer<'a> {
+    fn ser_member(&self, member: &Self::Member<'_>) -> Self::MemberSer {
         member.to_be_bytes()
     }
 
diff --git a/chronik/chronik-db/src/io/group_history.rs b/chronik/chronik-db/src/io/group_history.rs
--- a/chronik/chronik-db/src/io/group_history.rs
+++ b/chronik/chronik-db/src/io/group_history.rs
@@ -116,7 +116,7 @@
 struct FetchedNumTxs<'tx, G: Group> {
     members_num_txs: Vec<NumTxs>,
     grouped_txs: BTreeMap<G::Member<'tx>, Vec<TxNum>>,
-    ser_members: Vec<G::MemberSer<'tx>>,
+    ser_members: Vec<G::MemberSer>,
 }
 
 pub(crate) fn bytes_to_num_txs(bytes: &[u8]) -> Result<NumTxs> {
diff --git a/chronik/chronik-db/src/mem/group_history.rs b/chronik/chronik-db/src/mem/group_history.rs
--- a/chronik/chronik-db/src/mem/group_history.rs
+++ b/chronik/chronik-db/src/mem/group_history.rs
@@ -39,7 +39,7 @@
             tx: &tx.tx,
         };
         for member in tx_members_for_group(&self.group, query, aux) {
-            let member_ser: G::MemberSer<'_> = self.group.ser_member(&member);
+            let member_ser: G::MemberSer = self.group.ser_member(&member);
             if !self.history.contains_key(member_ser.as_ref()) {
                 self.history
                     .insert(member_ser.as_ref().to_vec(), BTreeSet::new());
@@ -59,7 +59,7 @@
             tx: &tx.tx,
         };
         for member in tx_members_for_group(&self.group, query, aux) {
-            let member_ser: G::MemberSer<'_> = self.group.ser_member(&member);
+            let member_ser: G::MemberSer = self.group.ser_member(&member);
             if let Some(entries) = self.history.get_mut(member_ser.as_ref()) {
                 entries.remove(&(tx.time_first_seen, tx.tx.txid()));
                 if entries.is_empty() {
diff --git a/chronik/chronik-db/src/test/value_group.rs b/chronik/chronik-db/src/test/value_group.rs
--- a/chronik/chronik-db/src/test/value_group.rs
+++ b/chronik/chronik-db/src/test/value_group.rs
@@ -20,7 +20,7 @@
     type Aux = ();
     type Iter<'a> = Vec<MemberItem<i64>>;
     type Member<'a> = i64;
-    type MemberSer<'a> = [u8; 8];
+    type MemberSer = [u8; 8];
     type UtxoData = UtxoDataValue;
 
     fn input_members(
@@ -57,7 +57,7 @@
         outputs
     }
 
-    fn ser_member<'a>(&self, value: &i64) -> Self::MemberSer<'a> {
+    fn ser_member(&self, value: &i64) -> Self::MemberSer {
         ser_value(*value)
     }