diff --git a/glance/async_/flows/plugins/image_conversion.py b/glance/async_/flows/plugins/image_conversion.py
index b74fea1f3d..32c7b7fe09 100644
--- a/glance/async_/flows/plugins/image_conversion.py
+++ b/glance/async_/flows/plugins/image_conversion.py
@@ -15,7 +15,6 @@
 
 import json
 import os
-import sys
 
 from oslo_concurrency import processutils as putils
 from oslo_config import cfg
@@ -70,7 +69,7 @@ class _ConvertImage(task.Task):
         self.action_wrapper = action_wrapper
         self.image_id = action_wrapper.image_id
         self.dest_path = ""
-        self.python = CONF.wsgi.python_interpreter or sys.executable
+        self.python = CONF.wsgi.python_interpreter
         super(_ConvertImage, self).__init__(
             name='%s-Convert_Image-%s' % (task_type, task_id))
 
diff --git a/glance/tests/unit/async_/flows/plugins/test_image_conversion.py b/glance/tests/unit/async_/flows/plugins/test_image_conversion.py
index c5ca29b56a..77d68acf84 100644
--- a/glance/tests/unit/async_/flows/plugins/test_image_conversion.py
+++ b/glance/tests/unit/async_/flows/plugins/test_image_conversion.py
@@ -15,7 +15,6 @@
 
 import json
 import os
-import sys
 from unittest import mock
 
 import glance_store
@@ -266,16 +265,9 @@ class TestConvertImageTask(test_utils.BaseTestCase):
                 image_convert.revert(result=mock.MagicMock())
                 self.assertEqual(1, mock_os_remove.call_count)
 
-    def test_image_convert_interpreter_resolution(self):
-        # By default, wsgi.python_interpreter is None, which we should
-        # translate to sys.executable at runtime.
-        convert = image_conversion._ConvertImage(self.context,
-                                                 self.task.task_id,
-                                                 self.task_type,
-                                                 self.wrapper)
-        self.assertEqual(sys.executable, convert.python)
-
-        # If overridden, we should take the interpreter from config.
+    def test_image_convert_interpreter_configured(self):
+        # By default, wsgi.python_interpreter is None; if it is
+        # overridden, we should take the interpreter from config.
         fake_interpreter = '/usr/bin/python2.7'
         self.config(python_interpreter=fake_interpreter,
                     group='wsgi')
diff --git a/requirements.txt b/requirements.txt
index d14c82561e..1d24f6a2a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ sqlparse>=0.2.2 # BSD
 alembic>=0.9.6 # MIT
 httplib2>=0.9.1 # MIT
 oslo.config>=8.1.0 # Apache-2.0
-oslo.concurrency>=3.26.0 # Apache-2.0
+oslo.concurrency>=4.5.1 # Apache-2.0
 oslo.context>=2.22.0 # Apache-2.0
 oslo.upgradecheck>=1.3.0 # Apache-2.0
 oslo.utils>=4.7.0 # Apache-2.0