diff --git a/CHANGES b/CHANGES
index dbf3b11825..dbf67b1918 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,5 @@
 
-2.5-765 | 2018-07-23 23:38:28 +0000
+2.5-766 | 2018-07-24 01:39:07 +0000
 
   * Clusterization of configureation framework. (Johanna Amann, Corelight)
 
diff --git a/VERSION b/VERSION
index 83d9c9f70c..08fbf3ec7b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5-765
+2.5-766
diff --git a/testing/btest/scripts/base/frameworks/config/basic_cluster.bro b/testing/btest/scripts/base/frameworks/config/basic_cluster.bro
index c6e0bf15a6..6423773b26 100644
--- a/testing/btest/scripts/base/frameworks/config/basic_cluster.bro
+++ b/testing/btest/scripts/base/frameworks/config/basic_cluster.bro
@@ -1,3 +1,5 @@
+# @TEST-SERIALIZE: comm
+# 
 # @TEST-EXEC: btest-bg-run manager-1 BROPATH=$BROPATH:.. CLUSTER_NODE=manager-1 bro %INPUT
 # @TEST-EXEC: sleep 1
 # @TEST-EXEC: btest-bg-run worker-1  BROPATH=$BROPATH:.. CLUSTER_NODE=worker-1 bro %INPUT
diff --git a/testing/btest/scripts/base/frameworks/config/cluster_resend.bro b/testing/btest/scripts/base/frameworks/config/cluster_resend.bro
index 9e82672f2b..e5c871a578 100644
--- a/testing/btest/scripts/base/frameworks/config/cluster_resend.bro
+++ b/testing/btest/scripts/base/frameworks/config/cluster_resend.bro
@@ -1,3 +1,5 @@
+# @TEST-SERIALIZE: comm
+# 
 # @TEST-EXEC: btest-bg-run manager-1 BROPATH=$BROPATH:.. CLUSTER_NODE=manager-1 bro %INPUT
 # @TEST-EXEC: sleep 1
 # @TEST-EXEC: btest-bg-run worker-1  BROPATH=$BROPATH:.. CLUSTER_NODE=worker-1 bro %INPUT
diff --git a/testing/btest/scripts/base/frameworks/config/read_config_cluster.bro b/testing/btest/scripts/base/frameworks/config/read_config_cluster.bro
index 4d35b794bc..ea806fc18c 100644
--- a/testing/btest/scripts/base/frameworks/config/read_config_cluster.bro
+++ b/testing/btest/scripts/base/frameworks/config/read_config_cluster.bro
@@ -1,3 +1,5 @@
+# @TEST-SERIALIZE: comm
+# 
 # @TEST-EXEC: btest-bg-run manager-1 BROPATH=$BROPATH:.. CLUSTER_NODE=manager-1 bro %INPUT
 # @TEST-EXEC: sleep 1
 # @TEST-EXEC: btest-bg-run worker-1  BROPATH=$BROPATH:.. CLUSTER_NODE=worker-1 bro %INPUT