diff --git a/dist/client-registration-openapi-flattened.json b/dist/client-registration-openapi-flattened.json
index b420154..e5dae67 100644
--- a/dist/client-registration-openapi-flattened.json
+++ b/dist/client-registration-openapi-flattened.json
@@ -223,8 +223,11 @@
                             },
                             "backchannel_authentication_request_signing_alg": {
                               "type": "string",
-                              "minLength": 1,
-                              "maxLength": 8,
+                              "enum": [
+                                "RS256",
+                                "PS256",
+                                "ES256"
+                              ],
                               "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                             },
                             "backchannel_user_code_parameter_supported": {
@@ -505,8 +508,6 @@
                                 "ping",
                                 "push"
                               ],
-                              "minLength": 1,
-                              "maxLength": 8,
                               "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba"
                             },
                             "backchannel_client_notification_endpoint": {
@@ -517,8 +518,11 @@
                             },
                             "backchannel_authentication_request_signing_alg": {
                               "type": "string",
-                              "minLength": 1,
-                              "maxLength": 8,
+                              "enum": [
+                                "RS256",
+                                "PS256",
+                                "ES256"
+                              ],
                               "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                             },
                             "backchannel_user_code_parameter_supported": {
@@ -776,8 +780,6 @@
                                 "ping",
                                 "push"
                               ],
-                              "minLength": 1,
-                              "maxLength": 8,
                               "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba"
                             },
                             "backchannel_client_notification_endpoint": {
@@ -788,8 +790,11 @@
                             },
                             "backchannel_authentication_request_signing_alg": {
                               "type": "string",
-                              "minLength": 1,
-                              "maxLength": 8,
+                              "enum": [
+                                "RS256",
+                                "PS256",
+                                "ES256"
+                              ],
                               "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                             },
                             "backchannel_user_code_parameter_supported": {
diff --git a/dist/client-registration-openapi.json b/dist/client-registration-openapi.json
index 0cc22bb..37298b1 100644
--- a/dist/client-registration-openapi.json
+++ b/dist/client-registration-openapi.json
@@ -367,8 +367,11 @@
           },
           "backchannel_authentication_request_signing_alg": {
             "type": "string",
-            "minLength": 1,
-            "maxLength": 8,
+            "enum": [
+              "RS256",
+              "PS256",
+              "ES256"
+            ],
             "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
           },
           "backchannel_user_code_parameter_supported": {
diff --git a/dist/client-registration-openapi.yaml b/dist/client-registration-openapi.yaml
index b62c1b6..b61ae62 100644
--- a/dist/client-registration-openapi.yaml
+++ b/dist/client-registration-openapi.yaml
@@ -267,8 +267,10 @@ components:
             This must be a valid HTTPS URL
         backchannel_authentication_request_signing_alg:
           type: string
-          minLength: 1
-          maxLength: 8
+          enum:
+            - RS256
+            - PS256
+            - ES256
           description: >-
             As defined in CIBA - Registration and Discovery Metadata. 
             This value MUST be specified iff the grant_types includes 
diff --git a/dist/client-registration-swagger-flattened.json b/dist/client-registration-swagger-flattened.json
index 07f2783..d2d38c8 100644
--- a/dist/client-registration-swagger-flattened.json
+++ b/dist/client-registration-swagger-flattened.json
@@ -240,8 +240,11 @@
                         },
                         "backchannel_authentication_request_signing_alg": {
                           "type": "string",
-                          "minLength": 1,
-                          "maxLength": 8,
+                          "enum": [
+                            "RS256",
+                            "PS256",
+                            "ES256"
+                          ],
                           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                         },
                         "backchannel_user_code_parameter_supported": {
@@ -498,8 +501,6 @@
                             "ping",
                             "push"
                           ],
-                          "minLength": 1,
-                          "maxLength": 8,
                           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba"
                         },
                         "backchannel_client_notification_endpoint": {
@@ -510,8 +511,11 @@
                         },
                         "backchannel_authentication_request_signing_alg": {
                           "type": "string",
-                          "minLength": 1,
-                          "maxLength": 8,
+                          "enum": [
+                            "RS256",
+                            "PS256",
+                            "ES256"
+                          ],
                           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                         },
                         "backchannel_user_code_parameter_supported": {
@@ -768,8 +772,6 @@
                             "ping",
                             "push"
                           ],
-                          "minLength": 1,
-                          "maxLength": 8,
                           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba"
                         },
                         "backchannel_client_notification_endpoint": {
@@ -780,8 +782,11 @@
                         },
                         "backchannel_authentication_request_signing_alg": {
                           "type": "string",
-                          "minLength": 1,
-                          "maxLength": 8,
+                          "enum": [
+                            "RS256",
+                            "PS256",
+                            "ES256"
+                          ],
                           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
                         },
                         "backchannel_user_code_parameter_supported": {
diff --git a/dist/client-registration-swagger.json b/dist/client-registration-swagger.json
index 433c0ba..777d4e1 100644
--- a/dist/client-registration-swagger.json
+++ b/dist/client-registration-swagger.json
@@ -357,8 +357,11 @@
         },
         "backchannel_authentication_request_signing_alg": {
           "type": "string",
-          "minLength": 1,
-          "maxLength": 8,
+          "enum": [
+            "RS256",
+            "PS256",
+            "ES256"
+          ],
           "description": "As defined in CIBA - Registration and Discovery Metadata.  This value MUST be specified iff the grant_types includes  urn:openid:params:grant-type:ciba."
         },
         "backchannel_user_code_parameter_supported": {
diff --git a/dist/client-registration-swagger.yaml b/dist/client-registration-swagger.yaml
index 301e464..f579595 100644
--- a/dist/client-registration-swagger.yaml
+++ b/dist/client-registration-swagger.yaml
@@ -258,8 +258,10 @@ definitions:
           This must be a valid HTTPS URL
       backchannel_authentication_request_signing_alg:
         type: string
-        minLength: 1
-        maxLength: 8
+        enum:
+          - RS256
+          - PS256
+          - ES256
         description: >-
           As defined in CIBA - Registration and Discovery Metadata. 
           This value MUST be specified iff the grant_types includes