diff --git a/tox.ini b/tox.ini
index ac09c574..e6387bb9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ passenv =
     LD_LIBRARY_PATH
     PATH
 deps =
-    cryptography>=2.6
+    -rrequirements.txt
     gpg==1.10.0
     pytest
     pytest-cov