diff --git a/.apigentools-info b/.apigentools-info
index 70f7dc65eab6..d7421e2fb203 100644
--- a/.apigentools-info
+++ b/.apigentools-info
@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-01-24 20:59:45.105938",
-            "spec_repo_commit": "9d7a3d85"
+            "regenerated": "2024-01-25 15:52:49.755221",
+            "spec_repo_commit": "bdb7b215"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-01-24 20:59:45.120436",
-            "spec_repo_commit": "9d7a3d85"
+            "regenerated": "2024-01-25 15:52:49.775749",
+            "spec_repo_commit": "bdb7b215"
         }
     }
 }
\ No newline at end of file
diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index fabb982d2a2b..1435ae14cb46 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -16759,8 +16759,11 @@ components:
         expiration_date:
           description: A Unix millisecond timestamp giving an expiration date for
             the suppression rule. After this date, it won't suppress signals anymore.
+            If unset, the expiration date of the suppression rule is left untouched.
+            If set to `null`, the expiration date is removed.
           example: 1703187336000
           format: int64
+          nullable: true
           type: integer
         name:
           description: The name of the suppression rule.
diff --git a/lib/datadog_api_client/v2/models/security_monitoring_suppression_update_attributes.rb b/lib/datadog_api_client/v2/models/security_monitoring_suppression_update_attributes.rb
index 5887a1ffd927..a51a7f5b76ff 100644
--- a/lib/datadog_api_client/v2/models/security_monitoring_suppression_update_attributes.rb
+++ b/lib/datadog_api_client/v2/models/security_monitoring_suppression_update_attributes.rb
@@ -27,7 +27,7 @@ class SecurityMonitoringSuppressionUpdateAttributes
     # Whether the suppression rule is enabled.
     attr_accessor :enabled
 
-    # A Unix millisecond timestamp giving an expiration date for the suppression rule. After this date, it won't suppress signals anymore.
+    # A Unix millisecond timestamp giving an expiration date for the suppression rule. After this date, it won't suppress signals anymore. If unset, the expiration date of the suppression rule is left untouched. If set to `null`, the expiration date is removed.
     attr_accessor :expiration_date
 
     # The name of the suppression rule.
@@ -70,6 +70,14 @@ def self.openapi_types
       }
     end
 
+    # List of attributes with nullable: true
+    # @!visibility private
+    def self.openapi_nullable
+      Set.new([
+        :'expiration_date',
+      ])
+    end
+
     # Initializes the object
     # @param attributes [Hash] Model attributes in the form of hash
     # @!visibility private