diff --git a/libp2p/pubsub/gossipsub.py b/libp2p/pubsub/gossipsub.py
index cebc438b..c345c138 100644
--- a/libp2p/pubsub/gossipsub.py
+++ b/libp2p/pubsub/gossipsub.py
@@ -775,16 +775,16 @@ class GossipSub(IPubsubRouter, Service):
         # Get list of all seen (seqnos, from) from the (seqno, from) tuples in
         # seen_messages cache
         seen_seqnos_and_peers = [
-            seqno_and_from for seqno_and_from in self.pubsub.seen_messages.cache.keys()
+            str(seqno_and_from)
+            for seqno_and_from in self.pubsub.seen_messages.cache.keys()
         ]
 
         # Add all unknown message ids (ids that appear in ihave_msg but not in
         # seen_seqnos) to list of messages we want to request
-        # FIXME: Update type of message ID
-        msg_ids_wanted: list[Any] = [
+        msg_ids_wanted: list[str] = [
             msg_id
             for msg_id in ihave_msg.messageIDs
-            if literal_eval(msg_id) not in seen_seqnos_and_peers
+            if msg_id not in seen_seqnos_and_peers
         ]
 
         # Request messages with IWANT message
diff --git a/newsfragments/859.feature.rst b/newsfragments/859.feature.rst
new file mode 100644
index 00000000..7307c82f
--- /dev/null
+++ b/newsfragments/859.feature.rst
@@ -0,0 +1 @@
+Fix type for gossipsub_message_id for consistency and security