From 299718000cbac685b61e01b098e654386179fd9e Mon Sep 17 00:00:00 2001
From: Daniel Haag <121057143+denialhaag@users.noreply.github.com>
Date: Thu, 17 Sep 2026 22:38:14 -0400
Subject: [PATCH] Upgrade Ubuntu runners to 26.04

Assisted-by: GPT-6 Astra via Codex
---
 .github/workflows/cd.yml       |  4 ++--
 .github/workflows/ci.yml       | 10 +++++-----
 .github/workflows/upstream.yml |  2 +-
 .readthedocs.yaml              |  2 +-
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index f93b2c49..25c88c4d 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -25,8 +25,8 @@ jobs:
       matrix:
         runs-on:
           [
-            ubuntu-24.04,
-            ubuntu-24.04-arm,
+            ubuntu-26.04,
+            ubuntu-26.04-arm,
             macos-26,
             windows-2022,
             windows-11-arm,
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2d675391..d9b27ab8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,12 +30,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runs-on: [ubuntu-24.04, ubuntu-24.04-arm]
+        runs-on: [ubuntu-26.04, ubuntu-26.04-arm]
         compiler: [gcc]
         preset: [release]
         run-on-draft: [false]
         include:
-          - runs-on: ubuntu-24.04
+          - runs-on: ubuntu-26.04
             compiler: gcc
             preset: debug
             run-on-draft: true
@@ -121,7 +121,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runs-on: [ubuntu-24.04, ubuntu-24.04-arm, macos-26, windows-2022]
+        runs-on: [ubuntu-26.04, ubuntu-26.04-arm, macos-26, windows-2022]
     uses: munich-quantum-toolkit/workflows/.github/workflows/reusable-python-tests.yml@ace7363a2a8e036e5efc6717be67f1eda29a120e # v2.4.2
     with:
       runs-on: ${{ matrix.runs-on }}
@@ -166,8 +166,8 @@ jobs:
       matrix:
         runs-on:
           [
-            ubuntu-24.04,
-            ubuntu-24.04-arm,
+            ubuntu-26.04,
+            ubuntu-26.04-arm,
             macos-26,
             windows-2022,
             windows-11-arm,
diff --git a/.github/workflows/upstream.yml b/.github/workflows/upstream.yml
index a3b0315f..1e64c900 100644
--- a/.github/workflows/upstream.yml
+++ b/.github/workflows/upstream.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runs-on: [ubuntu-24.04, macos-26, windows-2022]
+        runs-on: [ubuntu-26.04, macos-26, windows-2022]
     uses: munich-quantum-toolkit/workflows/.github/workflows/reusable-qiskit-upstream-tests.yml@ace7363a2a8e036e5efc6717be67f1eda29a120e # v2.4.2
     with:
       runs-on: ${{ matrix.runs-on }}
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 84410fdc..e26151ce 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,7 +7,7 @@ sphinx:
   configuration: docs/conf.py
 
 build:
-  os: ubuntu-24.04
+  os: ubuntu-26.04
   tools:
     python: "3.14"
   apt_packages: