diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 8e9fa9e02..f4a87cef9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -6,7 +6,6 @@ on:
       - published
   push:
     branches:
-      - '3.0'
       - '4.0'
       - '5.0'
       - '5.2'
@@ -47,10 +46,7 @@ jobs:
         os:
          - alpine
          - ubuntu
-         - centos
-        exclude:
-          - os: centos
-            build: agent2
+         - ol
 
     runs-on: ubuntu-20.04
     steps:
diff --git a/web-apache-pgsql/ubuntu/Dockerfile b/web-apache-pgsql/ubuntu/Dockerfile
index c55c3c455..2f40d1644 100644
--- a/web-apache-pgsql/ubuntu/Dockerfile
+++ b/web-apache-pgsql/ubuntu/Dockerfile
@@ -85,7 +85,6 @@ RUN set -eux && \
     rm -f locale/add_new_language.sh locale/update_po.sh locale/make_mo.sh && \
     ln -s "/etc/zabbix/web/zabbix.conf.php" "/usr/share/zabbix/conf/zabbix.conf.php" && \
     ln -s "/etc/zabbix/web/maintenance.inc.php" "/usr/share/zabbix/conf/maintenance.inc.php" && \
-    ./locale/make_mo.sh && \
     mkdir -p /var/lib/locales/supported.d/ && \
     rm -f /var/lib/locales/supported.d/local && \
     cat /usr/share/zabbix/include/locales.inc.php | grep display | grep true | awk '{$1=$1};1' | \
diff --git a/web-nginx-pgsql/ubuntu/Dockerfile b/web-nginx-pgsql/ubuntu/Dockerfile
index 6fe8783ea..66e0a36d6 100644
--- a/web-nginx-pgsql/ubuntu/Dockerfile
+++ b/web-nginx-pgsql/ubuntu/Dockerfile
@@ -96,7 +96,6 @@ RUN set -eux && \
     rm -f locale/add_new_language.sh locale/update_po.sh locale/make_mo.sh && \
     ln -s "/etc/zabbix/web/zabbix.conf.php" "/usr/share/zabbix/conf/zabbix.conf.php" && \
     ln -s "/etc/zabbix/web/maintenance.inc.php" "/usr/share/zabbix/conf/maintenance.inc.php" && \
-    ./locale/make_mo.sh && \
     mkdir -p /var/lib/locales/supported.d/ && \
     rm -f /var/lib/locales/supported.d/local && \
     cat /usr/share/zabbix/include/locales.inc.php | grep display | grep true | awk '{$1=$1};1' | \