diff --git a/api/members/members_models/prompt_category.go b/api/members/members_models/prompt_category.go
index 697f9e3..02afc9d 100644
--- a/api/members/members_models/prompt_category.go
+++ b/api/members/members_models/prompt_category.go
@@ -34,7 +34,7 @@ type PromptCategory struct {
 	LastModifiedByID *string `json:"LastModifiedByID,omitempty"`
 
 	// The date the prompt category was last modified
-	LastModifiedDate string `json:"LastModifiedDate,omitempty"`
+	LastModifiedDate *string `json:"LastModifiedDate,omitempty"`
 
 	// The prompt category name
 	Name *string `json:"Name,omitempty"`
diff --git a/api/sfgate/sfgate_models/prompt_category.go b/api/sfgate/sfgate_models/prompt_category.go
index 92be069..d049d97 100644
--- a/api/sfgate/sfgate_models/prompt_category.go
+++ b/api/sfgate/sfgate_models/prompt_category.go
@@ -34,7 +34,7 @@ type PromptCategory struct {
 	LastModifiedByID *string `json:"LastModifiedByID,omitempty"`
 
 	// The date the prompt category was last modified
-	LastModifiedDate string `json:"LastModifiedDate,omitempty"`
+	LastModifiedDate *string `json:"LastModifiedDate,omitempty"`
 
 	// The prompt category name
 	Name *string `json:"Name,omitempty"`
diff --git a/swagger/defs/prompt-category.yaml b/swagger/defs/prompt-category.yaml
index f9a5f74..91b0289 100644
--- a/swagger/defs/prompt-category.yaml
+++ b/swagger/defs/prompt-category.yaml
@@ -19,6 +19,7 @@ PromptCategory:
     LastModifiedDate:
       description: The date the prompt category was last modified
       type: string
+      x-nullable: true
     LastModifiedByID:
       x-nullable: true
       description: The ID of the user who last modified the prompt category