diff --git a/schema/cryptography-defs.json b/schema/cryptography-defs.json
index e3e1728e..898beb5f 100644
--- a/schema/cryptography-defs.json
+++ b/schema/cryptography-defs.json
@@ -338,6 +338,16 @@
           "pattern": "AES[-(128|192|256)][-(GCM|CCM)][-{tagLength}][-{ivLength}]",
           "primitive": "ae"
         },
+        {
+          "standard": [
+            {
+              "name": "RFC 5297",
+              "url": "https://doi.org/10.17487/RFC5297"
+            }
+          ],
+          "pattern": "AES[-(128|192|256)]-SIV",
+          "primitive": "ae"
+        },
         {
           "standard": [
             {