diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
index 812c5a1e..003ae00c 100644
--- a/.github/workflows/regression.yml
+++ b/.github/workflows/regression.yml
@@ -14,6 +14,8 @@ jobs:
           - 12
           - 11
           - 10
+          - 9.6
+          - 9.5
 
     name: PostgreSQL ${{ matrix.pg }}
     runs-on: ubuntu-latest
diff --git a/doc/pg_repack.rst b/doc/pg_repack.rst
index 5da8e2f4..f4b1ab99 100644
--- a/doc/pg_repack.rst
+++ b/doc/pg_repack.rst
@@ -40,7 +40,9 @@ Requirements
 ------------
 
 PostgreSQL versions
-    PostgreSQL 9.4, 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16
+    PostgreSQL 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16.
+
+    PostgreSQL 9.4 and before it are not supported.
 
 Disks
     Performing a full-table repack requires free disk space about twice as
diff --git a/doc/pg_repack_jp.rst b/doc/pg_repack_jp.rst
index 28ff49f1..4c34eb68 100644
--- a/doc/pg_repack_jp.rst
+++ b/doc/pg_repack_jp.rst
@@ -62,7 +62,9 @@ pg_repackでは再編成する方法として次のものが選択できます
   ------------
   
   PostgreSQL versions
-      PostgreSQL 9.4, 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16
+      PostgreSQL 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16.
+  
+      PostgreSQL 9.4 and before it are not supported.
   
   Disks
       Performing a full-table repack requires free disk space about twice as
@@ -75,7 +77,7 @@ pg_repackでは再編成する方法として次のものが選択できます
 ---------
 
 PostgreSQL バージョン
-    PostgreSQL 9.4, 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16
+    PostgreSQL 9.5, 9.6, 10, 11, 12, 13, 14, 15, 16
 
 ディスク
     テーブル全体の再編成を行うには、対象となるテーブルと付属するインデックスのおよそ2倍のサイズのディスク空き容量が必要です。例えば、テーブルとインデックスを合わせたサイズが1GBの場合、2GBのディスク領域が必要となります。
diff --git a/lib/pg_repack.sql.in b/lib/pg_repack.sql.in
index cca6d134..f52d0cfe 100644
--- a/lib/pg_repack.sql.in
+++ b/lib/pg_repack.sql.in
@@ -277,7 +277,7 @@ CREATE VIEW repack.tables AS
          'SELECT repack.create_log_table(' || R.oid || ')' AS create_log,
          repack.get_create_trigger(R.oid, PK.indexrelid) AS create_trigger,
          repack.get_enable_trigger(R.oid) as enable_trigger,
-         'SELECT repack.create_table($1, $2)' AS create_table,
+         'SELECT repack.create_table($1, $2)'::text AS create_table,
          coalesce(S.spcname, S2.spcname) AS tablespace_orig,
          'INSERT INTO repack.table_' || R.oid || ' SELECT ' || repack.get_columns_for_create_as(R.oid) || ' FROM ONLY ' || repack.oid2text(R.oid) AS copy_data,
          repack.get_alter_col_storage(R.oid) AS alter_col_storage,
diff --git a/regress/travis_prepare.sh b/regress/travis_prepare.sh
deleted file mode 100755
index cee73cc5..00000000
--- a/regress/travis_prepare.sh
+++ /dev/null
@@ -1,69 +0,0 @@
-#!/bin/bash
-
-set -e -x
-
-export PACKAGE="$PGVER"
-export PGDIR="/usr/lib/postgresql/$PACKAGE"
-export CONFDIR="/etc/postgresql/$PACKAGE/main"
-export DATADIR="/var/lib/postgresql/$PACKAGE/main"
-export PGBIN="$PGDIR/bin"
-export PATH="$PGBIN:$PATH"
-
-# This also stops the server currently running on port 5432
-sudo apt-get remove -y libpq5
-
-# Match libpq and server-dev packages
-# See https://github.com/reorg/pg_repack/issues/63
-sudo sh -c 'echo "deb [arch=amd64] http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main ${PGVER}" > /etc/apt/sources.list.d/pgdg.list'
-
-# Import the repository signing key:
-wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
-
-sudo apt-get update
-
-# This might be a moving target, but it currently fails. 13 could start
-# failing in the future instead.
-# Some versions break if this is not specified (9.4 for sure, maybe 9.6)
-if [[ "$PGVER" = "9.4" ]]; then
-    sudo apt-get install -y "libpq5=${PGVER}*" "libpq-dev=${PGVER}*"
-    sudo apt-mark hold libpq5
-fi
-
-# missing build dependency by postgresql-server-dev
-if [[ "$PGVER" -ge "14" ]]; then
-    sudo apt-get install -y liblz4-dev
-fi
-
-if ! sudo apt-get install -y \
-    postgresql-$PGVER \
-    postgresql-client-$PGVER \
-    postgresql-server-dev-$PGVER
-then
-    sudo systemctl status postgresql.service -l
-    exit 1
-fi
-
-# ensure PostgreSQL is running on 5432 port with proper auth
-sudo sed -i \
-    's/\(^local[[:space:]]\+all[[:space:]]\+all[[:space:]]\+\).*/\1trust/' \
-    "$CONFDIR/pg_hba.conf"
-sudo bash -c "echo 'port=5432' >> $CONFDIR/postgresql.conf"
-sudo service postgresql restart $PGVER
-
-# ensure travis user exists. May be missed if the database was not provided by Travis
-userexists=`sudo -u postgres "$PGBIN/psql" -tc "select count(*) from pg_catalog.pg_user where usename='travis';"`
-if [ ${userexists} -eq 0  ]; then
-  sudo -u postgres "$PGBIN/psql" -c "create user travis superuser"
-fi
-
-# Go somewhere else or sudo will fail
-cd /
-
-# Already started because of installing posgresql-$PGVER
-# sudo -u postgres "$PGBIN/pg_ctl" -w -l /dev/null -D "$CONFDIR" start
-sudo -u postgres mkdir -p /var/lib/postgresql/testts
-sudo -u postgres "$PGBIN/psql" \
-    -c "create tablespace testts location '/var/lib/postgresql/testts'"
-
-# Go back to the build dir
-cd -
diff --git a/regress/travis_test.sh b/regress/travis_test.sh
deleted file mode 100755
index 763a705b..00000000
--- a/regress/travis_test.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/bin/bash
-
-set -x
-
-export PG_REGRESS_DIFF_OPTS=-u
-
-if ! make installcheck; then
-    cat regress/regression.diffs
-    exit 1
-fi