diff --git a/tox.ini b/tox.ini
index 3e387b4..1b9de4b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,17 @@ deps =
     .
 commands = {posargs}
 
+# Dogfood our current mastera version
+[testenv:dogfood]
+skip_install = true
+deps =
+    wheel
+commands =
+    python setup.py -qq bdist_wheel
+    pip install --pre --find-links ./dist/ flake8
+    flake8 --version
+    flake8 src/flake8/ tests/ setup.py
+
 # Linters
 [testenv:flake8]
 skipsdist = true
@@ -132,7 +143,7 @@ ignore = D203
 # NOTE(sigmavirus24): Once we release 3.0.0 this exclude option can be specified
 # across multiple lines. Presently it cannot be specified across multiple lines.
 # :-(
-exclude = .tox,.git,__pycache__,docs/source/conf.py,build,dist,tests/fixtures/*,*.pyc
+exclude = .tox,.git,__pycache__,docs/source/conf.py,build,dist,tests/fixtures/*,*.pyc,*.egg-info,./.cache,./.eggs
 max-complexity = 10
 import-order-style = google
 application-import-names = flake8