diff --git a/DOWNLOAD_AND_VERIFY_ISO.md b/DOWNLOAD_AND_VERIFY_ISO.md
index a0ea874fa..bae49c4ac 100644
--- a/DOWNLOAD_AND_VERIFY_ISO.md
+++ b/DOWNLOAD_AND_VERIFY_ISO.md
@@ -1,17 +1,17 @@
-### 3.1.0-20260521 ISO image released on 2026/05/21
+### 3.1.0-20260528 ISO image released on 2026/05/28
 
 
 ### Download and Verify
 
-3.1.0-20260521 ISO image:  
-https://download.securityonion.net/file/securityonion/securityonion-3.1.0-20260521.iso
+3.1.0-20260528 ISO image:  
+https://download.securityonion.net/file/securityonion/securityonion-3.1.0-20260528.iso
  
-MD5: A853BC118639ABCE1795D6E313BFFBDE  
-SHA1: FCA615AD6E31710B33AE5870FEF447861FDB3B8F  
-SHA256: CE2A5947274D9ED2C5068A1FD46B64C4FEF70445EA9B61A98DD3621781329F2C  
+MD5: 9D6FF58DEEE24089D722C73169765B3E  
+SHA1: 2B8B816B6CEC3B7F96B3C5E040EBF502DD2C412F  
+SHA256: 62FAB57E247C843D6A04F0796D8162C732B65D82FC3E4A59D087135B9FD32912  
 
 Signature for ISO image:  
-https://github.com/Security-Onion-Solutions/securityonion/raw/3/main/sigs/securityonion-3.1.0-20260521.iso.sig
+https://github.com/Security-Onion-Solutions/securityonion/raw/3/main/sigs/securityonion-3.1.0-20260528.iso.sig
 
 Signing key:  
 https://raw.githubusercontent.com/Security-Onion-Solutions/securityonion/3/main/KEYS  
@@ -25,22 +25,22 @@ wget https://raw.githubusercontent.com/Security-Onion-Solutions/securityonion/3/
 
 Download the signature file for the ISO:  
 ```
-wget https://github.com/Security-Onion-Solutions/securityonion/raw/3/main/sigs/securityonion-3.1.0-20260521.iso.sig
+wget https://github.com/Security-Onion-Solutions/securityonion/raw/3/main/sigs/securityonion-3.1.0-20260528.iso.sig
 ```
 
 Download the ISO image:  
 ```
-wget https://download.securityonion.net/file/securityonion/securityonion-3.1.0-20260521.iso
+wget https://download.securityonion.net/file/securityonion/securityonion-3.1.0-20260528.iso
 ```
 
 Verify the downloaded ISO image using the signature file:  
 ```
-gpg --verify securityonion-3.1.0-20260521.iso.sig securityonion-3.1.0-20260521.iso
+gpg --verify securityonion-3.1.0-20260528.iso.sig securityonion-3.1.0-20260528.iso
 ```
 
 The output should show "Good signature" and the Primary key fingerprint should match what's shown below:
 ```
-gpg: Signature made Thu 21 May 2026 11:10:01 AM EDT using RSA key ID FE507013
+gpg: Signature made Wed 27 May 2026 03:03:59 PM EDT using RSA key ID FE507013
 gpg: Good signature from "Security Onion Solutions, LLC <info@securityonionsolutions.com>"
 gpg: WARNING: This key is not certified with a trusted signature!
 gpg:          There is no indication that the signature belongs to the owner.
diff --git a/HOTFIX b/HOTFIX
index e69de29bb..8b1378917 100644
--- a/HOTFIX
+++ b/HOTFIX
@@ -0,0 +1 @@
+
diff --git a/salt/manager/tools/sbin/soup b/salt/manager/tools/sbin/soup
index c31891f1d..135c51276 100755
--- a/salt/manager/tools/sbin/soup
+++ b/salt/manager/tools/sbin/soup
@@ -535,6 +535,23 @@ elasticfleet_set_agent_logging_level_warn() {
     done <<< "$policies_to_update"
 }
 
+update_logstash_pipeline_name() {
+    local original_pipeline_name="$1"
+    local new_pipeline_name="$2"
+
+    echo "Checking for conflicting logstash defined_pipelines pillar value."
+    local LOGSTASH_FILE=/opt/so/saltstack/local/pillar/logstash/soc_logstash.sls
+    local MINIONDIR=/opt/so/saltstack/local/pillar/minions
+    for pillar_file in "$LOGSTASH_FILE" "$MINIONDIR"/*.sls; do
+        [[ -f "$pillar_file" ]] || continue
+        if grep -q "$original_pipeline_name$" "$pillar_file"; then
+            echo "Found conflicting defined_pipeline pillar value in $pillar_file. Updating to use the new logstash pipeline name."
+            sed -i "s#$original_pipeline_name\$#$new_pipeline_name#g" "$pillar_file"
+            chown socore:socore "$pillar_file"
+        fi
+    done
+}
+
 check_transform_health_and_reauthorize() {
     . /usr/sbin/so-elastic-fleet-common
 
@@ -678,6 +695,10 @@ rename_strelka_scan_lnk() {
   rm -f "$TMP_VALUE_FILE"
 }
 
+fix_logstash_0013_lumberjack_pipeline_name() {
+    update_logstash_pipeline_name "so/0013_input_lumberjack_fleet.conf" "so/0013_input_lumberjack_fleet.conf.jinja"
+}
+
 up_to_3.1.0() {
   ensure_postgres_local_pillar
   ensure_postgres_secret
@@ -686,6 +707,7 @@ up_to_3.1.0() {
   # Clear existing component template state file.
   rm -f /opt/so/state/esfleet_component_templates.json
   rename_strelka_scan_lnk
+  fix_logstash_0013_lumberjack_pipeline_name
 
   INSTALLEDVERSION=3.1.0
 }
@@ -1177,7 +1199,7 @@ verify_es_version_compatibility() {
 
             while IFS= read -r heavynode_minion; do
                 [[ -z "$heavynode_minion" ]] && continue
-                if ! echo "$HEAVYNODE_ES_VERSIONS" | jq -e --arg minion "$heavynode_minion" 'has($minion)' > /dev/null; then
+                if ! echo "$HEAVYNODE_ES_VERSIONS" | jq -se --arg minion "$heavynode_minion" 'add | has($minion)' > /dev/null; then
                     echo "Heavynode $heavynode_minion did not report an Elasticsearch version. It may be offline or still upgrading."
                     all_heavynodes_compatible=false
                 fi
@@ -1544,7 +1566,13 @@ EOF
 
 # Keeping this block in case we need to do a hotfix that requires salt update
 apply_hotfix() {
-   echo "No actions required. ($INSTALLEDVERSION/$HOTFIXVERSION)"
+    if [[ "$INSTALLEDVERSION" == "3.1.0" ]] ; then
+       # Do not remove this fix_logstash_0013_lumberjack_pipeline_name in future hotfixes without first validating older
+       #  installs referencing "so/0013_input_lumberjack_fleet.conf" via pillar are upgradable
+       fix_logstash_0013_lumberjack_pipeline_name
+    else
+        echo "No actions required. ($INSTALLEDVERSION/$HOTFIXVERSION)"
+    fi
 }
 
 failed_soup_restore_items() {
diff --git a/sigs/securityonion-3.1.0-20260528.iso.sig b/sigs/securityonion-3.1.0-20260528.iso.sig
new file mode 100644
index 000000000..e4bead44d
Binary files /dev/null and b/sigs/securityonion-3.1.0-20260528.iso.sig differ