diff --git a/.travis.yml b/.travis.yml
index 94a05d5..477118c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,16 +7,18 @@ matrix:
   include:
   # Separate job for linting
     - os: linux
-      python: "3.7"
+      python: "3.8"
       env: TOXENV=lint
   # Separate testing for different marshmallow versions in different jobs to ease debugging
     - os: linux
-      python: "3.7"
-      env: TOXENV=py37-marshmallow2
+      python: "3.8"
+      env: TOXENV=py38-marshmallow2
     - os: linux
-      python: "3.7"
-      env: TOXENV=py37-marshmallow3
+      python: "3.8"
+      env: TOXENV=py38-marshmallow3
     # These will test for both versions of marshmallow thanks to tox-travis package
+    - os: linux
+      python: "3.7"
     - os: linux
       python: "3.6"
     - os: linux
diff --git a/CHANGES b/CHANGES
index 7e769d2..4bb3965 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+0.9.0 (2020-01-18)
+
+0.8.0 (2019-10-08)
+
+0.7.0 (2019-08-11)
+
 0.6.0 (2019-06-16)
     - lots of various fixes
     - fix compatibility with brutusin/json-form
diff --git a/Makefile b/Makefile
index c3d37ca..154f873 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 PROJECT = marshmallow_jsonschema
 
-PYTHON_VERSION ?= 3.7
+PYTHON_VERSION ?= 3.8
 VIRTUAL_ENV ?= .venv
 PYTHON ?= $(VIRTUAL_ENV)/bin/python
 
diff --git a/pyproject.toml b/pyproject.toml
index 9749950..4f04370 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,2 @@
 [tool.black]
-target-version = ['py27', 'py35', 'py36', 'py37']
+target-version = ['py27', 'py35', 'py36', 'py37', 'py38']
diff --git a/requirements-tox.txt b/requirements-tox.txt
index 561349e..5473c6c 100644
--- a/requirements-tox.txt
+++ b/requirements-tox.txt
@@ -1 +1 @@
-tox>=3.13
+tox>=3.14.3
diff --git a/setup.py b/setup.py
index f3eb749..f529067 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def read(fname):
 
 setup(
     name="marshmallow-jsonschema",
-    version="0.8.0",
+    version="0.9.0",
     description="JSON Schema Draft v4 (http://json-schema.org/)"
     " formatting with marshmallow",
     long_description=long_description,
@@ -61,6 +61,7 @@ def read(fname):
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
     test_suite="tests",
 )
diff --git a/tests/__init__.py b/tests/__init__.py
index 8dcc82e..6d75bd9 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,5 +1,6 @@
 from jsonschema import Draft7Validator
 from marshmallow import Schema, fields, validate
+from marshmallow_jsonschema.compat import MARSHMALLOW_3
 
 from marshmallow_jsonschema import JSONSchema
 from marshmallow_jsonschema.compat import dot_data_backwards_compatible
@@ -26,7 +27,6 @@ class UserSchema(Schema):
     )
     created_iso = fields.DateTime(format="iso", attribute="created", dump_only=True)
     updated = fields.DateTime()
-    updated_local = fields.LocalDateTime(attribute="updated", dump_only=True)
     species = fields.String(attribute="SPECIES")
     id = fields.String(default="no-id")
     homepage = fields.Url()
@@ -54,6 +54,10 @@ class UserSchema(Schema):
     const = fields.String(validate=validate.Length(equal=50))
 
 
+if MARSHMALLOW_3:
+    UserSchema.updated_naive = fields.NaiveDateTime(attribute="updated", dump_only=True)
+
+
 def _validate_schema(schema):
     """
     raises jsonschema.exceptions.SchemaError
diff --git a/tox.ini b/tox.ini
index d7fcd6e..10729d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,11 @@
 [tox]
-envlist=lint,py{35,36,37,py3}-marshmallow{2,3}, py{27, py}-marshmallow2
+envlist=lint,py{27,35,36,37,38,py3}-marshmallow{2,3}, py{27, py}-marshmallow2
 
 [testenv]
 deps=
     -r requirements-test.txt
     marshmallow2: marshmallow<3.0
-    py{35,36,37,py3}-marshmallow3: marshmallow==3.0.0rc8
+    py{35,36,37,38,py3}-marshmallow3: marshmallow==3.3.0
 whitelist_externals=make
 commands=make test_coverage