diff --git a/tests/archive.py b/tests/archive.py
index 3f48a9f9..17e90ddc 100644
--- a/tests/archive.py
+++ b/tests/archive.py
@@ -1157,6 +1157,11 @@ class ArchiveTest(ProbackupTest, unittest.TestCase):
                 'checkpoint_timeout': '30s',
                 'autovacuum': 'off'})
 
+        if self.get_version(master) < self.version_to_num('9.6.0'):
+            self.del_test_dir(module_name, fname)
+            return unittest.skip(
+                'Skipped because backup from replica is not supported in PG 9.5')
+
         self.init_pb(backup_dir)
         self.add_instance(backup_dir, 'master', master)
         self.set_archiving(backup_dir, 'master', master)
@@ -2145,6 +2150,11 @@ class ArchiveTest(ProbackupTest, unittest.TestCase):
             initdb_params=['--data-checksums'],
             pg_options={'autovacuum': 'off'})
 
+        if self.get_version(node) < self.version_to_num('9.6.0'):
+            self.del_test_dir(module_name, fname)
+            return unittest.skip(
+                'Skipped because backup from replica is not supported in PG 9.5')
+
         self.init_pb(backup_dir)
         self.add_instance(backup_dir, 'node', node)
         self.set_archiving(backup_dir, 'node', node)
@@ -2321,7 +2331,7 @@ class ArchiveTest(ProbackupTest, unittest.TestCase):
         os.remove(os.path.join(replica.logs_dir, 'postgresql.log'))
         replica.slow_start(replica=True)
 
-        sleep(10)
+        sleep(60)
 
         with open(os.path.join(replica.logs_dir, 'postgresql.log'), 'r') as f:
             postgres_log_content = f.read()
diff --git a/tests/backup.py b/tests/backup.py
index c7b1291d..7c388cce 100644
--- a/tests/backup.py
+++ b/tests/backup.py
@@ -2718,6 +2718,7 @@ class BackupTest(ProbackupTest, unittest.TestCase):
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')
         node = self.make_simple_node(
             base_dir=os.path.join(module_name, fname, 'node'),
+            set_replication=True,
             initdb_params=['--data-checksums'])
 
         self.init_pb(backup_dir)
diff --git a/tests/helpers/ptrack_helpers.py b/tests/helpers/ptrack_helpers.py
index 53d4188b..2f95417d 100644
--- a/tests/helpers/ptrack_helpers.py
+++ b/tests/helpers/ptrack_helpers.py
@@ -340,7 +340,7 @@ class ProbackupTest(object):
 
         # set major version
         with open(os.path.join(node.data_dir, 'PG_VERSION')) as f:
-            node.major_version = str(f.read().rstrip())
+            node.major_version = float(str(f.read().rstrip()))
 
         # Sane default parameters
         options = {}
diff --git a/tests/page.py b/tests/page.py
index c38f98a4..d84003d6 100644
--- a/tests/page.py
+++ b/tests/page.py
@@ -517,7 +517,8 @@ class PageTest(ProbackupTest, unittest.TestCase):
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')
         node = self.make_simple_node(
             base_dir=os.path.join(module_name, fname, 'node'),
-            set_replication=True, initdb_params=['--data-checksums'],
+            set_replication=True,
+            initdb_params=['--data-checksums'],
             pg_options={
                 'checkpoint_timeout': '30s',
                 'autovacuum': 'off'
@@ -925,10 +926,13 @@ class PageTest(ProbackupTest, unittest.TestCase):
         fname = self.id().split('.')[3]
         node = self.make_simple_node(
             base_dir=os.path.join(module_name, fname, 'node'),
+            set_replication=True,
             initdb_params=['--data-checksums'])
 
         alien_node = self.make_simple_node(
-            base_dir=os.path.join(module_name, fname, 'alien_node'))
+            base_dir=os.path.join(module_name, fname, 'alien_node'),
+            set_replication=True,
+            initdb_params=['--data-checksums'])
 
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')
         self.init_pb(backup_dir)
diff --git a/tests/replica.py b/tests/replica.py
index a767f68e..62a56d8c 100644
--- a/tests/replica.py
+++ b/tests/replica.py
@@ -1333,6 +1333,8 @@ class ReplicaTest(ProbackupTest, unittest.TestCase):
         node1.promote()
         node1.safe_psql('postgres', 'CHECKPOINT')
 
+        sleep(5)
+
         # delta backup on timeline 3
         self.backup_node(
             backup_dir, 'node', node1, node1.data_dir, 'delta',
diff --git a/tests/set_backup.py b/tests/set_backup.py
index 861de756..f73b522c 100644
--- a/tests/set_backup.py
+++ b/tests/set_backup.py
@@ -426,6 +426,7 @@ class SetBackupTest(ProbackupTest, unittest.TestCase):
         fname = self.id().split('.')[3]
         node = self.make_simple_node(
             base_dir=os.path.join(module_name, fname, 'node'),
+            set_replication=True,
             initdb_params=['--data-checksums'])
 
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')