diff --git a/requirements/dev.txt b/requirements/dev.txt
index 566d0b3..672a7ca 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -2,4 +2,4 @@
 sphinx
 sphinx-rtd-theme
 mysqlclient
-psycopg2==2.6.1
+psycopg2
diff --git a/tox.ini b/tox.ini
index 8a0034b..0e399a4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,9 +9,9 @@ envlist =
 [testenv]
 commands=python {toxinidir}/tests/manage.py test core
 deps=
-    openpyxl==2.4.11
+    openpyxl
     tablibdev: -egit+https://github.com/kennethreitz/tablib.git#egg=tablib
-    tablibstable: tablib==0.12.1
+    tablibstable: tablib
     django18: Django>=1.8,<1.9
     django19: Django>=1.9,<1.10
     django110: Django>=1.10,<1.11