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+---
+title: SRE Team Update
+slug: 2024-12-20-sre
+authors: johnalotoski
+tags: [sre]
+hide_table_of_contents: false
+---
+
+## High level summary
+
+The SRE team continues work on Cardano environment improvements and general maintenance.
+
+Some notable recent changes, updates or improvements include:
+
+* Nixpkgs has been updated to `24.11` across all environments
+
+* Nix has been updated to `2.25.3` across all environments
+
+* TCP tuning was applied on one relay per pool group across all environments to
+  minimize round-tripping across long distances.
+
+* This is the last SRE update for 2024.  Hello 2025!
+
+## Repository Work
+
+### Cardano-parts
+* Nixpkgs has been updated to `24.11` and nix to `2.25.3`. NixosModules and
+  template just recipes with breaking changes from those updates were fixed. A
+  nix jobs GHA CI test was added to verify environment spin up procedure.
+  Template scripts were updated for compatibility with latest cardano-node
+  protocol version and recent cardano-cli breaking changes. More details are
+  available in the release notes:
+  [cardano-parts-release-v2024-12-19](https://github.com/input-output-hk/cardano-parts/releases/tag/v2024-12-19)
+
+### Cardano-playground
+* Nixpkgs has been updated to `24.11` and nix to `2.25.3` and all machines
+  deployed along with breaking changes fixes. A fund-transfer recipe was added
+  along with other miscellaneous improvements. More detail is available in the PR
+  description:
+  [cardano-playground-pull-38](https://github.com/input-output-hk/cardano-playground/pull/38)
+
+### Cardano-mainnet
+* Nixpkgs has been updated to `24.11` and nix to `2.25.3` and all machines deployed
+  along with breaking changes fixes. Bootstrap scaling servers were disabled and
+  block producer auto scheduled restarts were stopped. TCP transmission
+  optimization for long distances was applied to one relay per pool group. More
+  detail is available in the PR description:
+  [cardano-mainnet-pull-28](https://github.com/input-output-hk/cardano-mainnet/pull/28)
+
+### Iohk-nix
+* Tunes the target number of p2p established peers
+  [iohk-nix-pull-591](https://github.com/input-output-hk/iohk-nix/pull/591)