diff --git a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
index 107e02dcd..f44ef7556 100644
--- a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
+++ b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
@@ -199,6 +199,11 @@ proc trackRootChanges*(g: OnchainGroupManager) {.async.} =
       if proofResult.isErr():
         error "Failed to fetch Merkle proof", error = proofResult.error
       g.merkleProofCache = proofResult.get()
+
+      # also need update registerd membership
+      let memberCount = cast[float64](await wakuRlnContract.commitmentIndex().call())
+      waku_rln_number_registered_memberships.set(memberCount)
+
     await sleepAsync(rpcDelay)
 
 method atomicBatch*(
@@ -581,9 +586,6 @@ method init*(g: OnchainGroupManager): Future[GroupManagerResult[void]] {.async.}
   ethRpc.ondisconnect = proc() =
     asyncSpawn onDisconnect()
 
-  let memberCount = cast[float64](await wakuRlnContract.commitmentIndex().call())
-  waku_rln_number_registered_memberships.set(memberCount)
-
   g.initialized = true
   return ok()
 
diff --git a/waku/waku_rln_relay/protocol_metrics.nim b/waku/waku_rln_relay/protocol_metrics.nim
index 52a107772..54958f3e3 100644
--- a/waku/waku_rln_relay/protocol_metrics.nim
+++ b/waku/waku_rln_relay/protocol_metrics.nim
@@ -120,5 +120,6 @@ proc getRlnMetricsLogger*(): RLNMetricsLogger =
         info "Total proofs verified", count = freshProofsVerifiedCount
         info "Total proofs generated", count = freshProofsGeneratedCount
         info "Total proofs remaining", count = freshProofsRemainingCount
+        info "Total registered member", count = freshRegisteredMemberCount
 
   return logMetrics