diff --git a/tox.ini b/tox.ini
index cf970daf..88ae8715 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,12 @@
 [tox]
-envlist = py{27,34,35,36}-sphinx{13,14,15,16}, docs
+envlist = py{27,34,35,36,37}-sphinx{13,14,15,16,17,18}, docs
 
 [tox:travis]
-2.7 = py27-sphinx{13,14,15}
-3.4 = py34-sphinx{13,14,15}
-3.5 = py35-sphinx{13,14,15}
-3.6 = py36-sphinx{13,14,15}
+2.7 = py27-sphinx{13,14,15,16,17,18}
+3.4 = py34-sphinx{13,14,15,16,17,18}
+3.5 = py35-sphinx{13,14,15,16,17,18}
+3.6 = py36-sphinx{13,14,15,16,17,18}
+3.7 = py37-sphinx{13,14,15,16,17,18}
 
 [testenv]
 setev =
@@ -18,6 +19,8 @@ deps =
     sphinx14: Sphinx < 1.5
     sphinx15: Sphinx < 1.6
     sphinx16: Sphinx < 1.7
+    sphinx17: Sphinx < 1.8
+    sphinx18: Sphinx < 1.9
 commands =
     py.test {posargs}