diff --git a/ckan/plugins/core.py b/ckan/plugins/core.py
index 14098016d0d..9a95a42590e 100644
--- a/ckan/plugins/core.py
+++ b/ckan/plugins/core.py
@@ -112,10 +112,10 @@ def plugins_update():
     # the file containing them is imported, for example if two or more
     # extensions are defined in the same file.  Therefore we do a sanity
     # check and disable any that should not be active.
-    for env in PluginGlobals.env_registry.values():
-        for service in env.services.copy():
-            if service.__class__ not in _PLUGINS_CLASS:
-                service.deactivate()
+    for env in PluginGlobals.env.values():
+        for service, id_ in env.singleton_services.items():
+            if service not in _PLUGINS_CLASS:
+                PluginGlobals.plugin_instances[id_].deactivate()
 
     # Reset CKAN to reflect the currently enabled extensions.
     import ckan.config.environment as environment
diff --git a/ckan/tests/legacy/test_plugins.py b/ckan/tests/legacy/test_plugins.py
index 3af1524ad4b..7ec6bd59e71 100644
--- a/ckan/tests/legacy/test_plugins.py
+++ b/ckan/tests/legacy/test_plugins.py
@@ -101,7 +101,7 @@ def test_plugins_load(self):
 
         # synchronous_search automatically gets loaded
         current_plugins = set([plugins.get_plugin(p) for p in ['mapper_plugin', 'routes_plugin', 'synchronous_search'] + find_system_plugins()])
-        assert PluginGlobals.env().services == current_plugins
+        assert set(plugins.core._PLUGINS_SERVICE.values()) == current_plugins
         # cleanup
         config['ckan.plugins'] = config_plugins
         plugins.load_all()
@@ -175,10 +175,15 @@ def test_mapper_plugin_fired_on_delete(self):
 
     def test_routes_plugin_fired(self):
         with plugins.use_plugin('routes_plugin'):
-            routes_plugin = PluginGlobals.env_registry['pca'].plugin_registry['RoutesPlugin'].__instance__
-            assert routes_plugin.calls_made == ['before_map', 'after_map'], \
-                   routes_plugin.calls_made
+            pca = PluginGlobals.env['pca']
+            routes_plugin_idx = pca.singleton_services[
+                pca.plugin_registry['RoutesPlugin']
+            ]
+
+            routes_plugin = PluginGlobals.plugin_instances[routes_plugin_idx]
 
+            assert routes_plugin.calls_made == ['before_map', 'after_map'], \
+                routes_plugin.calls_made
 
     def test_action_plugin_override(self):
         status_show_original = logic.get_action('status_show')(None, {})
diff --git a/requirements.in b/requirements.in
index e2c65c86874..af12c768660 100644
--- a/requirements.in
+++ b/requirements.in
@@ -19,7 +19,7 @@ pysolr==3.6.0
 Pylons==0.9.7
 python-dateutil>=1.5.0
 pytz==2016.7
-pyutilib.component.core==4.6.4
+PyUtilib==5.7.1
 pyyaml  # needed by webassets. latest should be fine.
 repoze.who-friendlyform==1.0.8
 repoze.who==2.3
diff --git a/requirements.txt b/requirements.txt
index d563473965d..decccf4b28b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ python-dateutil==2.8.0
 python-editor==1.0.4      # via alembic
 python-magic==0.4.15
 pytz==2016.7
-pyutilib.component.core==4.6.4
+PyUtilib==5.7.1
 pyyaml==5.1
 redis==3.2.1              # via rq
 repoze.lru==0.7           # via routes