diff --git a/src/test/perl/PostgreSQL/Test/Cluster.pm b/src/test/perl/PostgreSQL/Test/Cluster.pm
new file mode 100644
index 00000000000..1e2fb50d6da
--- /dev/null
+++ b/src/test/perl/PostgreSQL/Test/Cluster.pm
@@ -0,0 +1,16 @@
+
+# Copyright (c) 2022, PostgreSQL Global Development Group
+
+# allow use of release 15+ perl namespace in older branches
+# just 'use' the older module name.
+# See PostgresNode.pm for function implementations
+
+package PostgreSQL::Test::Cluster;
+
+use strict;
+use warnings;
+
+use PostgresNode;
+
+1;
+
diff --git a/src/test/perl/PostgreSQL/Test/Utils.pm b/src/test/perl/PostgreSQL/Test/Utils.pm
new file mode 100644
index 00000000000..1f922e77486
--- /dev/null
+++ b/src/test/perl/PostgreSQL/Test/Utils.pm
@@ -0,0 +1,40 @@
+# Copyright (c) 2022, PostgreSQL Global Development Group
+
+# allow use of release 15+ perl namespace in older branches
+# just 'use' the older module name.
+# We export the same names as the v15 module.
+# See TestLib.pm for alias assignment that makes this all work.
+
+package PostgreSQL::Test::Utils;
+
+use strict;
+use warnings;
+
+use Exporter 'import';
+
+use TestLib;
+
+our @EXPORT = qw(
+  generate_ascii_string
+  slurp_dir
+  slurp_file
+  append_to_file
+  system_or_bail
+  system_log
+  run_log
+
+  command_ok
+  command_fails
+  command_exit_is
+  program_help_ok
+  program_version_ok
+  program_options_handling_ok
+  command_like
+  command_like_safe
+  command_fails_like
+  command_checks_all
+
+  $windows_os
+);
+
+1;
diff --git a/src/test/perl/PostgresNode.pm b/src/test/perl/PostgresNode.pm
index d673494e889..29a5e883536 100644
--- a/src/test/perl/PostgresNode.pm
+++ b/src/test/perl/PostgresNode.pm
@@ -2098,4 +2098,14 @@ sub pg_recvlogical_upto
 
 =cut
 
+# support release 15+ perl module namespace
+
+package PostgreSQL::Test::Cluster; ## no critic (ProhibitMultiplePackages)
+
+sub new
+{
+	shift; # remove class param from args
+	return PostgresNode->get_new_node(@_);
+}
+
 1;
diff --git a/src/test/perl/TestLib.pm b/src/test/perl/TestLib.pm
index 73db8f43406..f94a71cd8e3 100644
--- a/src/test/perl/TestLib.pm
+++ b/src/test/perl/TestLib.pm
@@ -41,6 +41,7 @@ our @EXPORT = qw(
   command_like
   command_like_safe
   command_fails_like
+  command_checks_all
 
   $windows_os
 );
@@ -453,4 +454,39 @@ sub command_checks_all
 	return;
 }
 
+# support release 15+ perl module namespace
+
+package PostgreSQL::Test::Utils; ## no critic (ProhibitMultiplePackages)
+
+# we don't want to export anything here, but we want to support things called
+# via this package name explicitly.
+
+# use typeglobs to alias these functions and variables
+
+no warnings qw(once);
+
+*generate_ascii_string = *TestLib::generate_ascii_string;
+*slurp_dir = *TestLib::slurp_dir;
+*slurp_file = *TestLib::slurp_file;
+*append_to_file = *TestLib::append_to_file;
+*system_or_bail = *TestLib::system_or_bail;
+*system_log = *TestLib::system_log;
+*run_log = *TestLib::run_log;
+*command_ok = *TestLib::command_ok;
+*command_fails = *TestLib::command_fails;
+*command_exit_is = *TestLib::command_exit_is;
+*program_help_ok = *TestLib::program_help_ok;
+*program_version_ok = *TestLib::program_version_ok;
+*program_options_handling_ok = *TestLib::program_options_handling_ok;
+*command_like = *TestLib::command_like;
+*command_like_safe = *TestLib::command_like_safe;
+*command_fails_like = *TestLib::command_fails_like;
+*command_checks_all = *TestLib::command_checks_all;
+
+*windows_os = *TestLib::windows_os;
+*timeout_default = *TestLib::timeout_default;
+*tmp_check = *TestLib::tmp_check;
+*log_path = *TestLib::log_path;
+*test_logfile = *TestLib::test_log_file;
+
 1;