diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7023ba3..af6ff9a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,7 +1,7 @@
 colossus>=1.2.1
 coverage==4.5.1
 coveralls
-cryptography==41.0.4
+cryptography==41.0.6
 flake8==2.6.0
 halomod @ git+git://github.com/steven-murray/hmf.git@unit-tests
 mpmath==1.3.0