diff --git a/setup.py b/setup.py
index e36c1469..7a41eeb5 100644
--- a/setup.py
+++ b/setup.py
@@ -33,12 +33,14 @@
     keywords="asyncio xmpp library",
     install_requires=['aiosasl',
                       'aioopenssl',
-                      'dnspython3',
-                      'lxml',
-                      'orderedset',
-                      'pyOpenSSL',
+                      'babel~=2.3',
+                      'dnspython3~=1.14',
+                      'lxml~=3.6',
+                      'multidict~=2.0',
+                      'orderedset>=1.2',
+                      'pyOpenSSL>=15.0',
                       'pyasn1',
                       'pyasn1_modules',
-                      'tzlocal'],
+                      'tzlocal~=1.2'],
     packages=find_packages(exclude=["tests*"])
 )