diff --git a/requirements.txt b/requirements.txt
index 4d15d54..6787c62 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cryptography==2.9.2
 lxml==4.9.1
-pyasn1==0.4.5
+pyasn1==0.6.3
 signxml==2.6.0
 six==1.12.0