diff --git a/yang/ietf/frr-deviations-ietf-key-chain.yang b/yang/ietf/frr-deviations-ietf-key-chain.yang
new file mode 100644
index 000000000000..aa6a41f8841c
--- /dev/null
+++ b/yang/ietf/frr-deviations-ietf-key-chain.yang
@@ -0,0 +1,29 @@
+module frr-deviations-ietf-key-chain {
+  yang-version 1.1;
+  namespace "http://frrouting.org/yang/frr-deviations-ietf-key-chain";
+  prefix frr-deviations-ietf-key-chain;
+
+  import ietf-key-chain {
+    prefix kc;
+  }
+
+  organization
+    "FRRouting";
+  contact
+    "FRR Users List:       <mailto:frog@lists.frrouting.org>
+     FRR Development List: <mailto:dev@lists.frrouting.org>";
+  description
+    "This module defines deviation statements for the ietf-key-chain
+     module.";
+
+  revision 2024-03-03 {
+    description "Initial revision.";
+    reference "RFC 8177: YANG Data Model for Key Chains";
+  }
+
+  deviation /kc:key-chains/kc:key-chain/kc:key/kc:crypto-algorithm {
+    deviate replace {
+      mandatory false;
+    }
+  }
+}
diff --git a/yang/subdir.am b/yang/subdir.am
index 6609971910c2..6745d537125a 100644
--- a/yang/subdir.am
+++ b/yang/subdir.am
@@ -35,6 +35,7 @@ dist_yangmodels_DATA += yang/frr-bgp-route-map.yang
 dist_yangmodels_DATA += yang/frr-vrf.yang
 dist_yangmodels_DATA += yang/frr-route-types.yang
 dist_yangmodels_DATA += yang/frr-routing.yang
+dist_yangmodels_DATA += yang/ietf/frr-deviations-ietf-key-chain.yang
 dist_yangmodels_DATA += yang/ietf/ietf-routing-types.yang
 dist_yangmodels_DATA += yang/ietf/ietf-interfaces.yang
 dist_yangmodels_DATA += yang/ietf/ietf-bgp-types.yang