diff --git a/.travis.yml b/.travis.yml
index 0a069cc4..8952a4ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,10 @@ python:
 - '3.5'
 - '3.6'
 env:
-- TOXENV=py-pytest34
-- TOXENV=py-pytest35
+- TOXENV=py-pytest30
+- TOXENV=py-pytest31
+- TOXENV=py-pytest32
+- TOXENV=py-pytest33
 - TOXENV=py-pytest36
 
 install: pip install tox setuptools_scm
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 35199550..bd08eb60 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,16 @@
+pytest-xdist 1.22.5 (2018-07-27)
+================================
+
+Bug Fixes
+---------
+
+- `#321 <https://github.com/pytest-dev/pytest-xdist/issues/321>`_: Revert change that dropped support for ``pytest<3.4`` and require ``six``.
+
+  This change caused problems in some installations, and was a mistaken
+  in the first place as we should not change version requirements
+  in bug-fix releases unless they fix an actual bug.
+
+
 pytest-xdist 1.22.4 (2018-07-27)
 ================================
 
diff --git a/appveyor.yml b/appveyor.yml
index 7e8ef39c..bc785971 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,11 +1,13 @@
 environment:
   matrix:
-  - TOXENV: "py27-pytest36"
-  - TOXENV: "py34-pytest36"
-  - TOXENV: "py35-pytest36"
+  # note: please use "tox --listenvs" to populate the build matrix
+  - TOXENV: "py27-pytest33"
+  - TOXENV: "py34-pytest33"
+  - TOXENV: "py35-pytest33"
+  - TOXENV: "py36-pytest33"
   - TOXENV: "py36-pytest36"
-  - TOXENV: "py27-pytest36-pexpect"
-  - TOXENV: "py36-pytest36-pexpect"
+  - TOXENV: "py27-pytest33-pexpect"
+  - TOXENV: "py36-pytest33-pexpect"
 
 install:
   - C:\Python36\python -m pip install -U tox setuptools_scm pip
diff --git a/setup.py b/setup.py
index 4c57d371..fcd29610 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-install_requires = ["execnet>=1.1", "pytest>=3.4", "pytest-forked"]
+install_requires = ["execnet>=1.1", "pytest>=3.0.0", "pytest-forked", "six"]
 
 
 setup(
diff --git a/tox.ini b/tox.ini
index f1273da4..11afb372 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 # if you change the envlist, please update .travis.yml file as well
 envlist=
   linting
-  py{27,34,35,36}-pytest{34,35,36}
+  py{27,34,35,36}-pytest{30,31,32,33,36}
   py{27,36}-pytest36-pexpect
   py{27,36}-pytest{master,features}
 
@@ -14,8 +14,10 @@ deps =
   pycmd
   # to avoid .eggs
   setuptools_scm
-  pytest34: pytest~=3.4.0
-  pytest35: pytest~=3.5.0
+  pytest30: pytest~=3.0.5
+  pytest31: pytest~=3.1.0
+  pytest32: pytest~=3.2.0
+  pytest33: pytest~=3.3.0
   pytest36: pytest~=3.6.0
   pytestmaster: git+https://github.com/pytest-dev/pytest.git@master
   pytestfeatures: git+https://github.com/pytest-dev/pytest.git@features