workflows: more concurrency changelog

src/content/changelog/workflows/2025-02-25-workflows-concurrency-increased.mdx

@@ -0,0 +1,13 @@
+---
+title: Concurrent Workflow instances limits increased.
+description: Increased concurrency limits for Workflows instances
+products:
+  - workflows
+date: 2025-02-2515:00:00Z
+---
+
+import { Render, PackageManagers, TypeScriptExample } from "~/components"
+
+[Workflows](/workflows/) now supports up to 4,500 concurrent (running) instances, up from the previous limit of 100. This limit will continue to increase during the Workflows open beta. This increase applies to all users on the Workers Paid plan, and takes effect immediately. 
+
+Review the Workflows [limits documentation](/workflows/reference/limits) and/or dive into the [get started guide](/workflows/get-started/guide/) to start building on Workflows.

src/content/docs/workflows/reference/limits.mdx

@@ -25,7 +25,7 @@ Many limits are inherited from those applied to Workers scripts and as documente
 | Maximum `step.sleep` duration             | 365 days (1 year) [^1] | 365 days (1 year) [^1] |
 | Maximum steps per Workflow [^5]           | 1024 [^1] | 1024 [^1] |
 | Maximum Workflow executions               | 100,000 per day [shared with Workers daily limit](/workers/platform/limits/#worker-limits) | Unlimited |
-| Concurrent Workflow instances (executions) per account   | 25 | 100 [^1] |
+| Concurrent Workflow instances (executions) per account   | 25 | 4500 [^1] |
 | Maximum number of [queued instances](/workflows/observability/metrics-analytics/#event-types) | 10,000 [^1] | 100,000 [^1] |
 | Retention limit for completed Workflow state | 3 days | 30 days [^2] |
 | Maximum length of a Workflow ID [^4]         | 64 characters | 64 characters |