diff --git a/requirements.txt b/requirements.txt
index 2c75c34..f2b802c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ suds >= 0.4
 suds_requests >= 0.3
 defusedxml >= 0.4.1, < 0.6
 eight >= 0.3.0, < 0.5
-cryptography >= 1.8, < 1.10
+cryptography >= 1.8, < 3
 pyOpenSSL >= 16.0.0, < 17
 certifi >= 2015.11.20.1
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