diff --git a/tools/pip-requires b/tools/pip-requires
index 0019f6c81..f93089ee8 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -1,4 +1,5 @@
 argparse
+iso8601>=0.1.4
 prettytable
 requests>=0.8.8,<1.0
 simplejson
diff --git a/tools/test-requires b/tools/test-requires
index 2eaef06eb..5e2d17b6f 100644
--- a/tools/test-requires
+++ b/tools/test-requires
@@ -13,6 +13,5 @@ pep8==1.3.3
 sphinx>=1.1.2
 testtools>=0.9.22
 WebOb==1.0.8
-iso8601>=0.1.4
 
 Babel