diff --git a/setup.py b/setup.py
index 85af963f9..96fa74e5f 100644
--- a/setup.py
+++ b/setup.py
@@ -15,17 +15,17 @@ with open(os.path.join(here, 'README.rst'), encoding='utf-8') as f:
     long_description = f.read()
 
 deps = {
-    "pyasn1~=0.1.9",
-    "pyOpenSSL~=0.15.1",
-    "cryptography~=1.1.0",
-    "passlib~=1.6.5",
-    "hpack~=2.0.1",
-    "six~=1.10.0",
-    "certifi>=2015.9.6.2", # no semver here - this should always be on the last release!
-    "backports.ssl_match_hostname~=3.4.0.2",
+    "pyasn1>=0.1.9, <0.2",
+    "pyOpenSSL>=0.15.1, <0.16",
+    "cryptography>=1.1.1, <1.2",
+    "passlib>=1.6.5, <1.7",
+    "hpack>=2.0.1, <2.1",
+    "six>=1.10.0, <1.11",
+    "certifi>=2015.9.6.2",  # no semver here - this should always be on the last release!
+    "backports.ssl_match_hostname>=3.4.0.2, <3.4.1",
 }
 if sys.version_info < (3, 0):
-    deps.add("ipaddress~=1.0.15")
+    deps.add("ipaddress>=1.0.15, <1.1")
 
 setup(
     name="netlib",