diff --git a/.travis.yml b/.travis.yml
index 4b74e8d2..fbd95414 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,15 +5,8 @@ cache: pip
 
 matrix:
   include:
-    - python: 2.6
-      env: TOXENV=py26
-      dist: trusty
     - python: 2.7
       env: TOXENV=py27
-    - python: 3.3
-      env: TOXENV=py33
-      dist: trusty
-      sudo: false
     - python: 3.4
       env: TOXENV=py34
     - python: 3.5
@@ -26,10 +19,10 @@ matrix:
       sudo: required  # required for Python 3.7 (travis-ci/travis-ci#9069)
 
 install:
-  - pip install tox==2.9.1
-  - pip install virtualenv==15.2.0
-  - pip install py==1.4.30
-  - pip install pluggy==0.5.2
+  - pip install tox==3.14.0
+  - pip install virtualenv==16.7.5
+  - pip install py==1.8.0
+  - pip install pluggy==0.13.0
 
 before_script:
   # Run flake8 tests only on Python 2.7 and 3.7...
@@ -38,7 +31,7 @@ before_script:
   - if [[ $TRAVIS_PYTHON_VERSION == *.7 ]]; then
       pip install flake8;
       flake8 . --count --exit-zero --select=E901,E999,F821,F822,F823 --show-source --statistics;
-      flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics; 
+      flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics;
     fi
 
 script:
diff --git a/setup.py b/setup.py
index 11d694c2..5ae9165c 100755
--- a/setup.py
+++ b/setup.py
@@ -95,10 +95,8 @@
 CLASSIFIERS = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 2",
-    "Programming Language :: Python :: 2.6",
     "Programming Language :: Python :: 2.7",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.3",
     "Programming Language :: Python :: 3.4",
     "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: 3.6",
@@ -175,7 +173,7 @@
       packages=PACKAGES,
       package_data=PACKAGE_DATA,
       include_package_data=True,
-      python_requires=">=2.6, !=3.0.*, !=3.1.*, !=3.2.*",
+      python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
       classifiers=CLASSIFIERS,
       **setup_kwds
      )
diff --git a/tox.ini b/tox.ini
index f5c013f8..ec680a69 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,8 @@
 [tox]
-envlist = py26,py27,py33,py34,py35,py36,py37
+envlist = py27,py34,py35,py36,py37
 
 [testenv]
 deps =
     pytest
     unittest2
-    py26: importlib
 commands = pytest {posargs}