changelog: workflows concurrency increased

Author: elithrar

src/content/changelogs-next/2025-02-03-workflows-concurrency-increased.mdx

@@ -0,0 +1,14 @@
+---
+title: Concurrent Workflow instances limits increased.
+description: Increased concurrency limits for Workflows instances
+products:
+  - workflows
+date: 2025-02-03T14:00:00Z
+---
+
+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 effective 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/changelogs/workflows.yaml

@@ -5,6 +5,12 @@ productLink: "/workflows/"
 productArea: Developer platform
 productAreaLink: /workers/platform/changelog/platform/
 entries:
+  - publish_date: "2025-02-03"
+      title: "Concurrent Workflows limit increased"
+      description: |-
+        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 effective immediately.
   - publish_date: "2024-12-19"
     title: "Better instance control, improved queued logic, and step limit increased"
     description: |-

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

@@ -25,8 +25,8 @@ 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] |
-| Maximum number of [queued instances](/workflows/observability/metrics-analytics/#event-types) | 10,000 [^1] | 100,000 [^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 |