diff --git a/oslo_cache/backends/etcd3gw.py b/oslo_cache/backends/etcd3gw.py
index aac16d58..89db5696 100644
--- a/oslo_cache/backends/etcd3gw.py
+++ b/oslo_cache/backends/etcd3gw.py
@@ -17,9 +17,9 @@
 from __future__ import absolute_import
 from dogpile.cache import api
 import etcd3gw
-import json
 
 from oslo_cache import core
+from oslo_serialization import jsonutils
 
 __all__ = [
     'Etcd3gwCacheBackend'
@@ -50,7 +50,7 @@ class Etcd3gwCacheBackend(api.CacheBackend):
         values = self._client.get(key, False)
         if not values:
             return core.NO_VALUE
-        value, metadata = json.loads(values[0])
+        value, metadata = jsonutils.loads(values[0])
         return api.CachedValue(value, metadata)
 
     def get_multi(self, keys):
@@ -65,7 +65,7 @@ class Etcd3gwCacheBackend(api.CacheBackend):
         if self.timeout:
             lease = self._client.lease(ttl=self.timeout)
         for key, value in mapping.items():
-            self._client.put(key, json.dumps(value), lease)
+            self._client.put(key, jsonutils.dumps(value), lease)
 
     def delete(self, key):
         self._client.delete(key)
diff --git a/oslo_cache/core.py b/oslo_cache/core.py
index 5b7dcfad..384e42f6 100644
--- a/oslo_cache/core.py
+++ b/oslo_cache/core.py
@@ -129,8 +129,8 @@ def _build_cache_config(conf):
         # directly makes for odd behaviors when wrapping dogpile.cache in
         # a library like oslo.cache
         if (conf.cache.backend
-                in ('dogpile.cache.memcached', 'oslo_cache.memcache_pool')
-                and argname == 'url'):
+                in ('dogpile.cache.memcached', 'oslo_cache.memcache_pool') and
+                argname == 'url'):
             argvalue = argvalue.split(',')
         conf_dict[arg_key] = argvalue
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 0fc85177..a9e9f99b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+hacking>=1.1.0,<1.2.0 # Apache-2.0
 mock>=2.0.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
 pifpaf>=0.10.0 # Apache-2.0