diff --git a/python/mach/mach/config.py b/python/mach/mach/config.py
--- a/python/mach/mach/config.py
+++ b/python/mach/mach/config.py
@@ -17,6 +17,7 @@
 from __future__ import absolute_import, unicode_literals
 
 import collections
+import collections.abc
 import os
 import sys
 import six
@@ -146,7 +147,7 @@
     return _
 
 
-class ConfigSettings(collections.Mapping):
+class ConfigSettings(collections.abc.Mapping):
     """Interface for configuration settings.
 
     This is the main interface to the configuration.
@@ -192,7 +193,7 @@
     will result in exceptions being raised.
     """
 
-    class ConfigSection(collections.MutableMapping, object):
+    class ConfigSection(collections.abc.MutableMapping, object):
         """Represents an individual config section."""
 
         def __init__(self, config, name, settings):
@@ -317,13 +318,7 @@
         self._config.write(fh)
 
     @classmethod
-    def _format_metadata(
-        cls,
-        type_cls,
-        description,
-        default=DefaultValue,
-        extra=None,
-    ):
+    def _format_metadata(cls, type_cls, description, default=DefaultValue, extra=None):
         """Formats and returns the metadata for a setting.
 
         Each setting must have:
@@ -344,10 +339,7 @@
         if isinstance(type_cls, string_types):
             type_cls = TYPE_CLASSES[type_cls]
 
-        meta = {
-            "description": description,
-            "type_cls": type_cls,
-        }
+        meta = {"description": description, "type_cls": type_cls}
 
         if default != DefaultValue:
             meta["default"] = default
diff --git a/python/mach/mach/decorators.py b/python/mach/mach/decorators.py
--- a/python/mach/mach/decorators.py
+++ b/python/mach/mach/decorators.py
@@ -6,6 +6,7 @@
 
 import argparse
 import collections
+import collections.abc
 
 from .base import MachError
 from .registrar import Registrar
@@ -151,7 +152,7 @@
             + "of functions. Found %s instead."
         )
 
-        if not isinstance(command.conditions, collections.Iterable):
+        if not isinstance(command.conditions, collections.abc.Iterable):
             msg = msg % (command.name, type(command.conditions))
             raise MachError(msg)
 
diff --git a/python/mach/mach/main.py b/python/mach/mach/main.py
--- a/python/mach/mach/main.py
+++ b/python/mach/mach/main.py
@@ -16,7 +16,7 @@
 import sys
 import traceback
 import uuid
-from collections import Iterable
+from collections.abc import Iterable
 
 from six import string_types
 
@@ -34,10 +34,7 @@
 from .logging import LoggingManager
 from .registrar import Registrar
 from .sentry import register_sentry, NoopErrorReporter
-from .telemetry import (
-    report_invocation_metrics,
-    create_telemetry_from_environment,
-)
+from .telemetry import report_invocation_metrics, create_telemetry_from_environment
 from .util import setenv, UserError
 
 SUGGEST_MACH_BUSTED_TEMPLATE = r"""
diff --git a/python/mozbuild/mozbuild/backend/configenvironment.py b/python/mozbuild/mozbuild/backend/configenvironment.py
--- a/python/mozbuild/mozbuild/backend/configenvironment.py
+++ b/python/mozbuild/mozbuild/backend/configenvironment.py
@@ -9,7 +9,8 @@
 import sys
 import json
 
-from collections import Iterable, OrderedDict
+from collections.abc import Iterable
+from collections import OrderedDict
 from types import ModuleType
 
 import mozpack.path as mozpath
@@ -62,10 +63,7 @@
                     compile(source, path, "exec", dont_inherit=1),
                 )
 
-        g = {
-            "__builtins__": __builtins__,
-            "__file__": path,
-        }
+        g = {"__builtins__": __builtins__, "__file__": path}
         l = {}
         try:
             exec(code_cache[path][1], g, l)
diff --git a/python/mozbuild/mozbuild/makeutil.py b/python/mozbuild/mozbuild/makeutil.py
--- a/python/mozbuild/mozbuild/makeutil.py
+++ b/python/mozbuild/mozbuild/makeutil.py
@@ -7,7 +7,7 @@
 import os
 import re
 import six
-from collections import Iterable
+from collections.abc import Iterable
 
 
 class Makefile(object):
diff --git a/python/mozbuild/mozbuild/util.py b/python/mozbuild/mozbuild/util.py
--- a/python/mozbuild/mozbuild/util.py
+++ b/python/mozbuild/mozbuild/util.py
@@ -9,6 +9,7 @@
 
 import argparse
 import collections
+import collections.abc
 import ctypes
 import difflib
 import errno
@@ -809,7 +810,7 @@
         self._strings = StrictOrderingOnAppendList()
         self._children = {}
 
-    class StringListAdaptor(collections.Sequence):
+    class StringListAdaptor(collections.abc.Sequence):
         def __init__(self, hsl):
             self._hsl = hsl
 
diff --git a/taskcluster/taskgraph/util/schema.py b/taskcluster/taskgraph/util/schema.py
--- a/taskcluster/taskgraph/util/schema.py
+++ b/taskcluster/taskgraph/util/schema.py
@@ -7,6 +7,7 @@
 import re
 import pprint
 import collections
+import collections.abc
 import voluptuous
 
 from six import text_type, iteritems
@@ -190,7 +191,7 @@
                     )
                 )
 
-        if isinstance(sch, collections.Mapping):
+        if isinstance(sch, collections.abc.Mapping):
             for k, v in iteritems(sch):
                 child = "{}[{!r}]".format(path, k)
                 check_identifier(child, k)
diff --git a/testing/mozbase/manifestparser/manifestparser/filters.py b/testing/mozbase/manifestparser/manifestparser/filters.py
--- a/testing/mozbase/manifestparser/manifestparser/filters.py
+++ b/testing/mozbase/manifestparser/manifestparser/filters.py
@@ -12,7 +12,8 @@
 
 import itertools
 import os
-from collections import defaultdict, MutableSequence
+from collections import defaultdict
+from collections.abc import MutableSequence
 
 import six
 from six import string_types
diff --git a/third_party/python/gyp/pylib/gyp/common.py b/third_party/python/gyp/pylib/gyp/common.py
--- a/third_party/python/gyp/pylib/gyp/common.py
+++ b/third_party/python/gyp/pylib/gyp/common.py
@@ -5,6 +5,7 @@
 from __future__ import with_statement
 
 import collections
+import collections.abc
 import errno
 import filecmp
 import os.path
@@ -494,7 +495,7 @@
 
 
 # Based on http://code.activestate.com/recipes/576694/.
-class OrderedSet(collections.MutableSet):
+class OrderedSet(collections.abc.MutableSet):
   def __init__(self, iterable=None):
     self.end = end = []
     end += [None, end, end]         # sentinel node for doubly linked list