Outage in Retool
React App Builder Sandbox Installs May Fail to Install Dependencies
Resolved MajorIncident Report
Summary AI Generated
A downstream dependency issue caused Retool's React App Builder sandbox to fail when installing dependencies, affecting newly created React apps, new publishes, and cold sandbox starts on versions 4.0.0+ across both Cloud and Self-Hosted instances. The incident lasted approximately 6 hours, with Cloud resolved first, followed by Self-Hosted via patched images (4.0.12-stable, 4.43.0-edge); unpatched Self-Hosted deployments were set to self-resolve by August 24th due to a 5-day minimum dependency release age policy. Existing published apps that had not been republished after August 19th were unaffected.
Retool's app builder may fail to install and connect to a sandbox due to downstream dependency issues. This affects both Cloud and Self-Hosted Retool instances.
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Latest Updates ( sorted recent to last )
RESOLVED
8 days ago - at 08/20/2026 11:20PM
This incident is resolved. Images with the fix are out:
4.0.12-stable
4.43.0-edge
Our minimum release age for React app builder dependencies is 5 days, so this incident will self-resolve for any self-hosted deployments that don't upgrade on August 24th, by 7am PST. All currently affected self-hosted versions:
stable: 4.0.0 - 4.0.11
edge: 4.1, 4.9, 4.16, 4.19, 4.23, 4.27, 4.31, 4.35, 4.40
MONITORING
8 days ago - at 08/20/2026 09:08PM
Images with the fix are out:
4.0.12-stable
4.43.0-edge
Our minimum release age for React app builder dependencies is 5 days, so this incident will self-resolve for any self-hosted deployments that don't upgrade on August 24th, by 7am PST. All currently affected self-hosted versions:
stable: 4.0.0 - 4.0.11
edge: 4.1, 4.9, 4.16, 4.19, 4.23, 4.27, 4.31, 4.35, 4.40
IDENTIFIED
8 days ago - at 08/20/2026 06:16PM
This issue affects Retool version 4.0.0+ (stable and edge), specifically for 1) newly-created React apps, 2) new publishes of existing React apps, and 3) cold starts of sandboxes when editing existing React apps.
Existing published apps that do not get published after August 19th are unaffected.
Self-hosted customers can update to 4.43.0-edge to get an immediate fix. A patch to our stable release channel is coming soon.
IDENTIFIED
8 days ago - at 08/20/2026 05:30PM
This issue no longer affects the React App Builder on Retool Cloud.
We have identified the issue for self-hosted, and are working on releasing images with a fix
INVESTIGATING
8 days ago - at 08/20/2026 05:26PM
Retool's app builder may fail to install and connect to a sandbox due to downstream dependency issues. This affects both Cloud and Self-Hosted Retool instances.
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