diff --git a/unshackle/core/session.py b/unshackle/core/session.py
index 298b6c6..dd5dc5b 100644
--- a/unshackle/core/session.py
+++ b/unshackle/core/session.py
@@ -26,7 +26,7 @@ FINGERPRINT_PRESETS = {
         "ja3": (
             "771,"  # TLS 1.2
             "4865-4866-4867-49195-49196-52393-49199-49200-52392-49171-49172-156-157-47-53,"  # Ciphers
-            "0-23-65281-10-11-35-16-5-13-51-45-43-21,"  # Extensions
+            "0-23-65281-10-11-35-16-5-13-51-45-43,"  # Extensions
             "29-23-24,"  # Named groups (x25519, secp256r1, secp384r1)
             "0"  # EC point formats
         ),
@@ -37,7 +37,7 @@ FINGERPRINT_PRESETS = {
         "ja3": (
             "771,"  # TLS 1.2
             "4865-4866-4867-49195-49199-49196-49200-52393-52392-49171-49172-156-157-47-53,"  # Ciphers
-            "0-23-65281-10-11-35-16-5-13-51-45-43-21,"  # Extensions
+            "0-23-65281-10-11-35-16-5-13-51-45-43,"  # Extensions
             "29-23-24,"  # Named groups (x25519, secp256r1, secp384r1)
             "0"  # EC point formats
         ),