diff --git a/setup.py b/setup.py
index cf1de1c..14b8095 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 requirements = {
     "package": [
-        "PyYAML<4",
+        "PyYAML>=5",
     ],
     "test": [
         "nose",
@@ -25,7 +25,7 @@
 
 setup(
     name='yamlsettings',
-    version='1.0.3',
+    version='2.0.0',
     description='Yaml Settings Configuration Module',
     long_description=readme,
     author='Kyle James Walker',
diff --git a/yamlsettings/extensions/base.py b/yamlsettings/extensions/base.py
index 4678a60..82b2301 100644
--- a/yamlsettings/extensions/base.py
+++ b/yamlsettings/extensions/base.py
@@ -28,7 +28,7 @@ def conform_query(cls, query):
         for key, vals in query.items():
             # Multiple values of the same name could be passed use first
             # Also params without strings will be treated as true values
-            query[key] = yaml.load(vals[0] or 'true')
+            query[key] = yaml.load(vals[0] or 'true', Loader=yaml.FullLoader)
 
         # If expected, populate with defaults
         for key, val in cls.default_query.items():
diff --git a/yamlsettings/yamldict.py b/yamlsettings/yamldict.py
index f2ff987..92f3aec 100644
--- a/yamlsettings/yamldict.py
+++ b/yamlsettings/yamldict.py
@@ -82,8 +82,9 @@ def _update_node(base_node, update_node):
                     new_node = base_node
                 for k, v in update_node.items():
                     new_node[k] = _update_node(new_node.get(k), v)
-            elif isinstance(update_node, list) or \
-                    isinstance(update_node, tuple):
+            elif isinstance(update_node, list) or isinstance(
+                update_node, tuple
+            ):
                 # NOTE: A list/tuple is replaced by a new list/tuple.
                 new_node = []
                 for v in update_node:
@@ -125,7 +126,7 @@ def limit(self, keys):
             self.pop(k)
 
 
-class YAMLDictLoader(yaml.Loader):
+class YAMLDictLoader(yaml.FullLoader, yaml.constructor.UnsafeConstructor):
     '''
     Loader for YAMLDict object
     Adopted from:
@@ -133,7 +134,7 @@ class YAMLDictLoader(yaml.Loader):
     '''
 
     def __init__(self, *args, **kwargs):
-        yaml.Loader.__init__(self, *args, **kwargs)
+        super(YAMLDictLoader, self).__init__(*args, **kwargs)
         # override constructors for maps (i.e. dictionaries)
         self.add_constructor(u'tag:yaml.org,2002:map',
                              type(self).construct_yaml_map)
@@ -242,8 +243,8 @@ def __init__(self, stream,
                  default_style=None, default_flow_style=None,
                  canonical=None, indent=None, width=None,
                  allow_unicode=None, line_break=None,
-                 encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None):
+                 encoding=None, version=None, tags=None,
+                 explicit_start=None, explicit_end=None, sort_keys=None):
         yaml.emitter.Emitter.__init__(self, stream, canonical=canonical,
                                       indent=indent, width=width,
                                       allow_unicode=allow_unicode,
@@ -259,17 +260,27 @@ def __init__(self, stream,
         yaml.resolver.Resolver.__init__(self)
 
 
-def dump(data, stream=None, **kwds):
+def dump(data, stream=None, **kwargs):
     """
     Serialize YAMLDict into a YAML stream.
     If stream is None, return the produced string instead.
     """
-    return yaml.dump_all([data], stream, Dumper=YAMLDictDumper, **kwds)
+    return yaml.dump_all(
+        [data],
+        stream=stream,
+        Dumper=YAMLDictDumper,
+        **kwargs
+    )
 
 
-def dump_all(data_list, stream=None, **kwds):
+def dump_all(data_list, stream=None, **kwargs):
     """
     Serialize YAMLDict into a YAML stream.
     If stream is None, return the produced string instead.
     """
-    return yaml.dump_all(data_list, stream, Dumper=YAMLDictDumper, **kwds)
+    return yaml.dump_all(
+        data_list,
+        stream=stream,
+        Dumper=YAMLDictDumper,
+        **kwargs
+    )