diff --git a/debian/resources/postgresql.sh b/debian/resources/postgresql.sh
index def850c..26cb852 100755
--- a/debian/resources/postgresql.sh
+++ b/debian/resources/postgresql.sh
@@ -31,6 +31,7 @@ mkdir /etc/apt/keyrings
 
 #postgres official repository
 if [ ."$database_repo" = ."official" ]; then
+	apt install -y gpg
 	sh -c 'echo "deb [signed-by=/etc/apt/keyrings/pgdg.gpg] http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
 	wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor -o /etc/apt/keyrings/pgdg.gpg
 	chmod 644 /etc/apt/keyrings/pgdg.gpg