diff --git a/.travis.yml b/.travis.yml
index ead3a97..33f6d6d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@
 sudo: false
 language: python
 python:
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"
diff --git a/pytest_mypy.py b/pytest_mypy.py
index 2dd5110..7ff64f2 100644
--- a/pytest_mypy.py
+++ b/pytest_mypy.py
@@ -55,7 +55,7 @@ def runtest(self):
         sources, options = mypy.main.process_options(mypy_argv)
 
         try:
-            res = mypy.main.type_check_only(sources, None, options)
+            res = mypy.main.type_check_only(sources, None, options, flush_errors=None)
             errors = res.errors
         except mypy.errors.CompileError as e:
             errors = e.messages
diff --git a/setup.py b/setup.py
index 9a65eaf..9355596 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ def read(fname):
     description='Mypy static type checker plugin for Pytest',
     long_description=read('README.rst'),
     py_modules=['pytest_mypy'],
-    install_requires=['pytest>=2.9.2', 'mypy>=0.470'],
+    install_requires=['pytest>=2.9.2', 'mypy>=0.570'],
     classifiers=[
         'Development Status :: 4 - Beta',
         'Framework :: Pytest',
@@ -31,7 +31,6 @@ def read(fname):
         'Topic :: Software Development :: Testing',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
diff --git a/tox.ini b/tox.ini
index d7da204..a4d711e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py33,py34,py35,flake8
+envlist = py34,py35,py36,flake8
 
 [testenv]
 deps = pytest