> For the complete documentation index, see [llms.txt](https://cardanoupgrades.docs.intersectmbo.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cardanoupgrades.docs.intersectmbo.org/general/hard-fork-working-group-meeting-minutes/21st-april-2026.md).

# 21st April 2026

#### Agenda

1. [Action items from the last call](https://cardanoupgrades.docs.intersectmbo.org/van-rossem-upgrade/hard-fork-working-group-meeting-minutes/14th-april-2026#action-items-and-next-steps) - Bosko
2. [Haskell node](https://github.com/IntersectMBO/cardano-node/releases) - Jeff and/or Ramsay
3. [Hard Fork Tentative Timeline](https://app.excalidraw.com/l/6GdMPTId7vW/1xnslUPryZP?__r=1773152516515)
4. [Risk log](https://docs.google.com/spreadsheets/d/1DSAiayrPOhhzSKKKljbd2WxHQPFmzKsvoyyA-BJUDg8/edit?gid=1105903724#gid=1105903724)
5. Plutus Cost Model
   1. [Impact on preview](https://x.com/alxaex/status/2046261718666330493)
6. AOB

#### Key materials

* [Summary and action items](https://docs.google.com/document/d/1jGnwbpa-96sM7Bs5duBO-cMGbb7FlBLx9o79U4cx4xo/edit?usp=sharing)
* Hard Fork Working Group communication channels
  * [Discord](https://discord.com/channels/1136727663583698984/1242097284619960411) — `#wg-hard-fork`
  * [Weekly bulletins](https://x.com/IntersectMBO)
  * [Luma calendar](https://luma.com/calendar/cal-TMjYNpSY4huYYif)
  * [This weeks X space](https://x.com/i/spaces/1RKjpzdjXMeJw?s=20)
* [Tentative timeline](https://app.excalidraw.com/s/6GdMPTId7vW/1xnslUPryZP)

#### Action items and next steps

* **Bosko Majdanac & Ryan Williams:** Update the Master Timeline to reflect the May 28th submission date and the potential June enactment.
* **Leonard Hegarty:** Lead the direct outreach to DApps to confirm Preview testing results and lack of hardcoding issues.
* **Samuel Leathers & IO Team:** Provide the Node v11.0 Mainnet-ready release by next week and resolve the minor issue regarding creating new testnets when experimental flags are disabled.
* **Bosko Majdanac:** Assign a single, specific owner to each item in the Risk Register to ensure clear accountability.
* **Terence McCutcheon:** Distribute the link and instructions for the publicly accessible Discord channel.
* **Bosko Majdanac & Leonard Hegarty:** Repurpose this Thursday’s X Space to be a technical session specifically for DApps and the Plutus Cost Model to address the hardcoding risks found on Preview.
* **Kevin Hammond & Ryan Williams:** Finalize the metadata to chain the Committee Minimum Size reduction action onto the Plutus parameter update.


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