diff --git a/VERSION b/VERSION
index 10ae03c7..93bd70cc 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.5.1-4
+5.5.1-5
diff --git a/changelog b/changelog
index a960939e..90f3c875 100644
--- a/changelog
+++ b/changelog
@@ -1,3 +1,9 @@
+03/10/2024 Changes in    v5.5.1-5
+==================================
+- Remove case insenstive duplicate options
+- Add values to return statements in msmilter
+- Fix regex for bad helo check in msmilter
+
 12/29/2023 Changes in    v5.5.1-4
 ==================================
 - Fix Exim code block
diff --git a/common/usr/sbin/MSMilter b/common/usr/sbin/MSMilter
index 7339429f..fbeeb6f2 100644
--- a/common/usr/sbin/MSMilter
+++ b/common/usr/sbin/MSMilter
@@ -159,7 +159,7 @@ sub helo_callback
     my $message_ref = $ctx->getpriv();
     my $message = "Received: from $helohost";
     # Check for unexpected helo
-    if ( ${$message_ref} =~ /^[0-9A-F]{7,20}|[0-9B-DF-HJ-NP-TV-Zb-df-hj-np-tv-z]{8,20}$/) {
+    if ( ${$message_ref} =~ /^(?:[0-9A-F]{7,20}|[0-9B-DF-HJ-NP-TV-Zb-df-hj-np-tv-z]{8,20})$/) {
         MailScanner::Log::WarnLog("Unexpected helo callback");
         return Sendmail::PMilter::SMFIS_TEMPFAIL;
     }