diff --git a/scripts/lib/setup-apt-repo b/scripts/lib/setup-apt-repo
index fce55f23a0..ced0a2ed47 100755
--- a/scripts/lib/setup-apt-repo
+++ b/scripts/lib/setup-apt-repo
@@ -37,14 +37,22 @@ SCRIPTS_PATH="$(dirname "$(dirname "$0")")"
 
 release=$(lsb_release -sc)
 if [[ "$release" =~ ^(xenial|bionic|cosmic|disco|eoan|focal)$ ]] ; then
+    apt-key add "$SCRIPTS_PATH"/setup/pgdg.asc
     apt-key add "$SCRIPTS_PATH"/setup/pgroonga-ppa.asc
     cat >$SOURCES_FILE <<EOF
+deb http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+deb-src http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+
 deb http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
 deb-src http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
 EOF
 elif [[ "$release" =~ ^(stretch|buster)$ ]] ; then
+    apt-key add "$SCRIPTS_PATH"/setup/pgdg.asc
     apt-key add "$SCRIPTS_PATH"/setup/pgroonga-debian.asc
     cat >$SOURCES_FILE <<EOF
+deb http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+deb-src http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+
 deb https://packages.groonga.org/debian/ $release main
 deb-src https://packages.groonga.org/debian/ $release main
 EOF
diff --git a/scripts/setup/pgdg.asc b/scripts/setup/pgdg.asc
new file mode 100644
index 0000000000..8480576ece
--- /dev/null
+++ b/scripts/setup/pgdg.asc
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