diff --git a/scripts/_common.sh b/scripts/_common.sh
index bab530d..c3d7381 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -19,6 +19,7 @@ YNH_COMPOSER_VERSION=2.3.7
 contextmenu_version=3.3.1
 automatic_addressbook_version=v0.4.3
 carddav_version=4.4.3
+calendar_version=3.5.7
 
 #=================================================
 # EXPERIMENTAL HELPERS
diff --git a/scripts/install b/scripts/install
index 6a8a2f5..4df7332 100644
--- a/scripts/install
+++ b/scripts/install
@@ -152,14 +152,16 @@ mkdir -p "$final_path/"{logs,temp}
 # Install net_LDAP
 ynh_composer_exec --commands="require kolab/net_ldap3"
 
-# Install contextmenu and automatic_addressbook plugins
-# https://plugins.roundcube.net/packages/sblaisot/automatic_addressbook
+# Install contextmenu, automatic_addressbook and calendar plugins
 # https://plugins.roundcube.net/#/packages/johndoh/contextmenu
+# https://plugins.roundcube.net/#/packages/projectmyst/automatic_addressbook
+# https://plugins.roundcube.net/#/packages/kolab/calendar
 ynh_composer_exec --commands="require \
     johndoh/contextmenu $contextmenu_version \
-    sblaisot/automatic_addressbook $automatic_addressbook_version"
+    sblaisot/automatic_addressbook $automatic_addressbook_version \
+    kolab/calendar $calendar_version"
 
-installed_plugins+=" 'contextmenu', 'automatic_addressbook',"
+installed_plugins+=" 'contextmenu', 'automatic_addressbook', 'calendar',"
 
 ynh_add_config --template="../conf/enigma.config.inc.php" --destination="$final_path/plugins/enigma/config.inc.php"
 mkdir -p "$final_path/plugins/enigma/home"
diff --git a/scripts/upgrade b/scripts/upgrade
index 532c9ea..6114eeb 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -204,14 +204,16 @@ then
     # Install net_LDAP
     ynh_composer_exec --commands="require kolab/net_ldap3"
 
-    # Update or install contextmenu and automatic_addressbook plugins
-    # https://plugins.roundcube.net/packages/sblaisot/automatic_addressbook
+    # Update or install contextmenu, automatic_addressbook and calendar plugins
     # https://plugins.roundcube.net/#/packages/johndoh/contextmenu
-    ynh_composer_exec --commands="update --no-dev --prefer-dist \
+    # https://plugins.roundcube.net/#/packages/projectmyst/automatic_addressbook
+    # https://plugins.roundcube.net/#/packages/kolab/calendar
+    ynh_composer_exec --commands="update --prefer-dist \
         johndoh/contextmenu $contextmenu_version \
-        sblaisot/automatic_addressbook $automatic_addressbook_version"
+        sblaisot/automatic_addressbook $automatic_addressbook_version \
+        kolab/calendar $calendar_version"
 
-    installed_plugins+=" 'contextmenu', 'automatic_addressbook',"
+    installed_plugins+=" 'contextmenu', 'automatic_addressbook', 'calendar',"
 
     ynh_add_config --template="../conf/enigma.config.inc.php" --destination="$final_path/plugins/enigma/config.inc.php"
     mkdir -p "$final_path/plugins/enigma/home"