diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74a61c7e9..57caee29c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,13 @@
+## moler 1.32.1
+
+### Improved
+* Check if passed object is ConnectionObserver instance in MolerConnectionForSingleThreadRunner
+
 ## moler 1.32.0
 
 ### Added
 * add `ADDITIONAL_PARAMS` in device configuration
+* add possibility use `single-threaded` runner for all ConnectionObservers
 
 ### Improved
 * Add more readable traceback
diff --git a/README.md b/README.md
index a4c8a9cfc..e3a7b9099 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![image](https://img.shields.io/badge/pypi-v1.32.0-blue.svg)](https://pypi.org/project/moler/)
+[![image](https://img.shields.io/badge/pypi-v1.32.1-blue.svg)](https://pypi.org/project/moler/)
 [![image](https://img.shields.io/badge/python-2.7%20%7C%203.6%20%7C%203.7%20%7C%203.8-blue.svg)](https://pypi.org/project/moler/)
 [![Build Status](https://travis-ci.org/nokia/moler.svg?branch=master)](https://travis-ci.org/nokia/moler)
 [![Coverage Status](https://coveralls.io/repos/github/nokia/moler/badge.svg?branch=master)](https://coveralls.io/github/nokia/moler?branch=master)
diff --git a/docs/source/conf.py b/docs/source/conf.py
index b9951c61f..0cd565224 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -24,7 +24,7 @@
 author = 'Nokia'
 
 # The short X.Y version
-version = '1.32.0'
+version = '1.32.1'
 # The full version, including alpha/beta/rc tags
 release = 'stable'
 
diff --git a/moler/config/__init__.py b/moler/config/__init__.py
index e58cc66ca..9333e1ba5 100644
--- a/moler/config/__init__.py
+++ b/moler/config/__init__.py
@@ -13,9 +13,9 @@
 from moler.helpers import compare_objects
 from moler.exceptions import MolerException
 from moler.exceptions import WrongUsage
-from . import connections as conn_cfg
-from . import devices as dev_cfg
-from . import loggers as log_cfg
+from moler.config import connections as conn_cfg
+from moler.config import devices as dev_cfg
+from moler.config import loggers as log_cfg
 
 loaded_config = ["NOT_LOADED_YET"]
 
diff --git a/moler/moler_connection_for_single_thread_runner.py b/moler/moler_connection_for_single_thread_runner.py
index fdb6cdc77..b2e184dc5 100644
--- a/moler/moler_connection_for_single_thread_runner.py
+++ b/moler/moler_connection_for_single_thread_runner.py
@@ -10,9 +10,9 @@
 __email__ = 'marcin.usielski@nokia.com'
 
 
+import moler.connection_observer
 from moler.abstract_moler_connection import identity_transformation
 from moler.observer_thread_wrapper import ObserverThreadWrapper, ObserverThreadWrapperForConnectionObserver
-from moler.connection_observer import ConnectionObserver
 from moler.threaded_moler_connection import ThreadedMolerConnection
 from moler.runner_single_thread import RunnerSingleThread
 import time
@@ -119,10 +119,22 @@ def _create_observer_wrapper(self, observer_reference, self_for_observer):
          to a function.
         :return: Instance of wrapper.
         """
-        if observer_reference is None or not isinstance(self_for_observer, ConnectionObserver):
-            otw = ObserverThreadWrapper(
+        if self._is_connection_observer_instance(self_for_observer) is True:
+            otw = ObserverThreadWrapperForConnectionObserver(
                 observer=observer_reference, observer_self=self_for_observer, logger=self.logger)
         else:
-            otw = ObserverThreadWrapperForConnectionObserver(
+            otw = ObserverThreadWrapper(
                 observer=observer_reference, observer_self=self_for_observer, logger=self.logger)
         return otw
+
+    def _is_connection_observer_instance(self, self_for_observer):
+        """
+        Check if argument is an instance of subclass of ConnectionObserver.
+        :param self_for_observer: object to check.
+        :return: True if observer_reference is a subclass of ConnectionObserver, False otherwise.
+        """
+        if self_for_observer is None:
+            return False
+        if isinstance(self_for_observer, moler.connection_observer.ConnectionObserver):
+            return True
+        return False
diff --git a/setup.py b/setup.py
index 4dde0d682..34ebf240e 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
 
 setup(
     name='moler',  # Required
-    version='1.32.0',  # Required
+    version='1.32.1',  # Required
     description='Moler is library to help in building automated tests',  # Required
     long_description=long_description,  # Optional
     long_description_content_type='text/markdown',  # Optional (see note above)
diff --git a/test/integration/test_io_raw_ssh.py b/test/integration/test_io_raw_ssh.py
index ea43781ee..ad4e5d30d 100644
--- a/test/integration/test_io_raw_ssh.py
+++ b/test/integration/test_io_raw_ssh.py
@@ -16,6 +16,10 @@
 import pytest
 import mock
 import threading
+import sys
+
+
+pytestmark = pytest.mark.skipif(sys.version_info < (3, 4), reason="requires python3.4 or higher")
 
 
 def test_can_create_passive_sshshell_connection_using_same_api(passive_sshshell_connection_class):