diff --git a/scripts/_common.sh b/scripts/_common.sh
index d902357..53fdfe8 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -249,7 +249,8 @@ myynh_execute_psql_as_root() {
 	ynh_handle_getopts_args "$@"
 	database="${database:-}"
 
-	if [ -n "$database" ]; then
+	if [ -n "$database" ]
+	then
 		database="--dbname=$database"
 	fi
 
@@ -265,6 +266,19 @@ myynh_create_psql_db() {
 	myynh_execute_psql_as_root --sql="ALTER USER $app WITH SUPERUSER;" --database="$app"
 }
 
+# Update the database
+myynh_update_psql_db() {
+	for db in postgres "$app"
+	do
+		test_collation_mismatch=$(ynh_exec_warn_less myynh_execute_psql_as_root --sql=";" --database="$db" | grep "collation version mismatch")
+		if [ -n "$test_collation_mismatch" ]
+		then
+			ynh_exec_warn_less myynh_execute_psql_as_root --sql="REINDEX DATABASE $db;" --database="$db"
+			myynh_execute_psql_as_root --sql="ALTER DATABASE $db REFRESH COLLATION VERSION;" --database="$db"
+		fi
+	done
+}
+
 # Remove the database
 myynh_drop_psql_db() {
 	myynh_execute_psql_as_root --sql="REVOKE CONNECT ON DATABASE $app FROM public;"
diff --git a/scripts/upgrade b/scripts/upgrade
index c6ffcff..1d608f8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -49,6 +49,13 @@ ynh_script_progression --message="Installing nodejs..." --weight=1
 
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version="$nodejs_version"
 
+#=================================================
+# UPDATE A POSTGRESQL DATABASE
+#=================================================
+ynh_script_progression --message="Udpating a PostgreSQL database..." --weight=1
+
+myynh_update_psql_db
+
 #=================================================
 # MAKE INSTALL
 #=================================================