diff --git a/.github/workflows/cmake_windows.yml b/.github/workflows/cmake_windows.yml
index 0eb1f47a1..b13ef9130 100644
--- a/.github/workflows/cmake_windows.yml
+++ b/.github/workflows/cmake_windows.yml
@@ -16,7 +16,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest]
+        # Pinned to windows-2022: windows-latest now ships Visual Studio 2026
+        # (MSVC 19.5), which makes Conan request the "Visual Studio 18 2026"
+        # generator that the installed CMake cannot create.
+        os: [windows-2022]
         build_type: [Release, Debug]
 
     steps:
diff --git a/.github/workflows/pixi.yaml b/.github/workflows/pixi.yaml
index 3b1aed4ff..c84e8422a 100644
--- a/.github/workflows/pixi.yaml
+++ b/.github/workflows/pixi.yaml
@@ -14,9 +14,13 @@ concurrency:
 jobs:
   pixi_conda_build:
     strategy:
+      fail-fast: false
       matrix:
         os:
-          - windows-latest
+          # Pinned to windows-2022: windows-latest now ships Visual Studio 2026,
+          # but cmake defaults to the "Visual Studio 17 2022" generator, which is
+          # no longer present ("could not find any instance of Visual Studio").
+          - windows-2022
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps: