diff --git a/protocol-models/src/main/resources/airbyte_protocol/airbyte_protocol.yaml b/protocol-models/src/main/resources/airbyte_protocol/airbyte_protocol.yaml
index a465bcb..0151a60 100644
--- a/protocol-models/src/main/resources/airbyte_protocol/airbyte_protocol.yaml
+++ b/protocol-models/src/main/resources/airbyte_protocol/airbyte_protocol.yaml
@@ -502,6 +502,12 @@ definitions:
       protocol_version:
         description: "the Airbyte Protocol version supported by the connector. Protocol versioning uses SemVer. "
         type: string
+      spec_version:
+        type: integer
+        description: |-
+          The version of the spec - if there is a change that requires to migrate the config of an actor, this number should be incremented.
+          This allows the platform to track whether a persisted config object is up to date or not.
+          Specifying a version is optional, but if a version of the connector specifies it, all subsequent versions must specify it as well. The number must either be incremented or stay the same.
   OAuthConfigSpecification:
     type: object
     additionalProperties: true
diff --git a/protocol-models/src/main/resources/airbyte_protocol/v0/airbyte_protocol.yaml b/protocol-models/src/main/resources/airbyte_protocol/v0/airbyte_protocol.yaml
index e17fc0f..f48f0d7 100644
--- a/protocol-models/src/main/resources/airbyte_protocol/v0/airbyte_protocol.yaml
+++ b/protocol-models/src/main/resources/airbyte_protocol/v0/airbyte_protocol.yaml
@@ -553,6 +553,12 @@ definitions:
       protocol_version:
         description: "the Airbyte Protocol version supported by the connector. Protocol versioning uses SemVer. "
         type: string
+      spec_version:
+        type: integer
+        description: |-
+          The version of the spec - if there is a change that requires to migrate the config of an actor, this number should be incremented.
+          This allows the platform to track whether a persisted config object is up to date or not.
+          Specifying a version is optional, but if a version of the connector specifies it, all subsequent versions must specify it as well. The number must either be incremented or stay the same.
   OAuthConfigSpecification:
     type: object
     additionalProperties: true