diff --git a/key_did_resolver/requirements.txt b/key_did_resolver/requirements.txt
index 49d97b0..d0029fa 100644
--- a/key_did_resolver/requirements.txt
+++ b/key_did_resolver/requirements.txt
@@ -1,3 +1,3 @@
-cryptography==3.4.7
+cryptography==43.0.1
 multiformats==0.3.1
 base58==2.1.1