diff --git a/src/types/comfyWorkflow.ts b/src/types/comfyWorkflow.ts
index f68a5b31ed..370918d911 100644
--- a/src/types/comfyWorkflow.ts
+++ b/src/types/comfyWorkflow.ts
@@ -1,4 +1,4 @@
-import { z } from 'zod'
+import { z, type SafeParseReturnType } from 'zod'
 import { fromZodError } from 'zod-validation-error'
 
 // GroupNode is hacking node id to be a string, so we need to allow that.
@@ -21,6 +21,14 @@ export const zSlotIndex = z.union([
 // - https://github.com/rgthree/rgthree-comfy Context Big node is using array as type.
 export const zDataType = z.union([z.string(), z.array(z.string()), z.number()])
 
+const zVector2 = z.union([
+  z
+    .object({ 0: z.number(), 1: z.number() })
+    .passthrough()
+    .transform((v) => [v[0], v[1]]),
+  z.tuple([z.number(), z.number()])
+])
+
 // Definition of an AI model file used in the workflow.
 const zModelFile = z.object({
   name: z.string(),
@@ -30,6 +38,13 @@ const zModelFile = z.object({
   directory: z.string()
 })
 
+const zGraphState = z.object({
+  lastGroupid: z.number().optional(),
+  lastNodeId: z.number().optional(),
+  lastLinkId: z.number().optional(),
+  lastRerouteId: z.number().optional()
+})
+
 const zComfyLink = z.tuple([
   z.number(), // Link id
   zNodeId, // Node id of source node
@@ -39,6 +54,23 @@ const zComfyLink = z.tuple([
   zDataType // Data type
 ])
 
+const zComfyLinkObject = z.object({
+  id: z.number(),
+  origin_id: zNodeId,
+  origin_slot: zSlotIndex,
+  target_id: zNodeId,
+  target_slot: zSlotIndex,
+  type: zDataType,
+  parentId: z.number().optional()
+})
+
+const zReroute = z.object({
+  id: z.number(),
+  parentId: z.number().optional(),
+  pos: zVector2,
+  linkIds: z.array(z.number()).nullish()
+})
+
 const zNodeOutput = z
   .object({
     name: z.string(),
@@ -73,14 +105,6 @@ const zProperties = z
   })
   .passthrough()
 
-const zVector2 = z.union([
-  z
-    .object({ 0: z.number(), 1: z.number() })
-    .passthrough()
-    .transform((v) => [v[0], v[1]]),
-  z.tuple([z.number(), z.number()])
-])
-
 const zWidgetValues = z.union([z.array(z.any()), z.record(z.any())])
 
 const zComfyNode = z
@@ -158,21 +182,54 @@ export const zComfyWorkflow = z
   })
   .passthrough()
 
+const zComfyWorkflow1 = z
+  .object({
+    version: z.number(),
+    config: zConfig.optional().nullable(),
+    state: zGraphState,
+    groups: z.array(zGroup).optional(),
+    nodes: z.array(zComfyNode),
+    links: z.array(zComfyLinkObject).optional(),
+    reroutes: z.array(zReroute).optional(),
+    extra: zExtra.optional().nullable(),
+    models: z.array(zModelFile).optional()
+  })
+  .passthrough()
+
 export type NodeInput = z.infer<typeof zNodeInput>
 export type NodeOutput = z.infer<typeof zNodeOutput>
 export type ComfyLink = z.infer<typeof zComfyLink>
 export type ComfyNode = z.infer<typeof zComfyNode>
-export type ComfyWorkflowJSON = z.infer<typeof zComfyWorkflow>
+export type ComfyWorkflowJSON = z.infer<
+  typeof zComfyWorkflow | typeof zComfyWorkflow1
+>
+
+const zWorkflowVersion = z.object({
+  version: z.number()
+})
 
 export async function validateComfyWorkflow(
-  data: any,
+  data: unknown,
   onError: (error: string) => void = console.warn
 ): Promise<ComfyWorkflowJSON | null> {
-  const result = await zComfyWorkflow.safeParseAsync(data)
-  if (!result.success) {
-    const error = fromZodError(result.error)
-    onError(`Invalid workflow against zod schema:\n${error}`)
+  const versionResult = zWorkflowVersion.safeParse(data)
+
+  let result: SafeParseReturnType<unknown, ComfyWorkflowJSON>
+  if (!versionResult.success) {
+    // Invalid workflow
+    const error = fromZodError(versionResult.error)
+    onError(`Workflow does not contain a valid version.  Zod error:\n${error}`)
     return null
+  } else if (versionResult.data.version === 1) {
+    // Schema version 1
+    result = await zComfyWorkflow1.safeParseAsync(data)
+  } else {
+    // Unknown or old version: 0.4
+    result = await zComfyWorkflow.safeParseAsync(data)
   }
-  return result.data
+  if (result.success) return result.data
+
+  const error = fromZodError(result.error)
+  onError(`Invalid workflow against zod schema:\n${error}`)
+  return null
 }
diff --git a/tests-ui/tests/fast/comfyWorkflow.test.ts b/tests-ui/tests/fast/comfyWorkflow.test.ts
index 4b86663478..8e27f3ff6a 100644
--- a/tests-ui/tests/fast/comfyWorkflow.test.ts
+++ b/tests-ui/tests/fast/comfyWorkflow.test.ts
@@ -32,10 +32,11 @@ describe('parseComfyWorkflow', () => {
     workflow.version = undefined
     expect(await validateComfyWorkflow(workflow)).toBeNull()
 
-    workflow.version = '1.0.1' // Invalid format.
+    workflow.version = '1.0.1' // Invalid format (string)
     expect(await validateComfyWorkflow(workflow)).toBeNull()
 
-    workflow.version = 1
+    // 2018-2024 schema: 0.4
+    workflow.version = 0.4
     expect(await validateComfyWorkflow(workflow)).not.toBeNull()
   })