diff --git a/requirements.txt b/requirements.txt
index b5b47be..5787c13 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,8 +4,8 @@ defusedxml==0.5.0
 fastchardet==0.2.0
 mock==2.0.0
 natsort==5.0.3
-pytest==3.1.3
+pytest>=3.1.3
 rdflib==3.4.0 # pyup: <4.0
-requests==2.18.1
+requests>=2.18.1
 simplejson==3.11.1
-spidermonkey==55.0a1.post2
\ No newline at end of file
+spidermonkey==55.0a1.post2