diff --git a/.github/workflows/cmake-multi-platform.yml b/.github/workflows/cmake-multi-platform.yml
index 13aee86..aefcbfa 100644
--- a/.github/workflows/cmake-multi-platform.yml
+++ b/.github/workflows/cmake-multi-platform.yml
@@ -19,6 +19,9 @@ jobs:
     name: Arch Linux (Clang)
     runs-on: ubuntu-latest
     container: archlinux:latest
+    env:
+      VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+      OMATH_BUILD_VIA_VCPKG: ON
 
     steps:
       - name: Install basic tool-chain with pacman
@@ -33,6 +36,12 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Set up vcpkg
+        shell: bash
+        run: |
+          git clone --depth 1 https://github.com/microsoft/vcpkg "$VCPKG_ROOT"
+          "$VCPKG_ROOT/bootstrap-vcpkg.sh" -disableMetrics
+
       - name: Configure (cmake --preset)
         shell: bash
         run: cmake --preset linux-release -DOMATH_BUILD_TESTS=ON -DOMATH_BUILD_BENCHMARK=OFF
@@ -47,12 +56,15 @@ jobs:
 
 
 
-##############################################################################
-# 2)  Windows  –  MSVC / Ninja
-##############################################################################
+  ##############################################################################
+  # 2)  Windows  –  MSVC / Ninja
+  ##############################################################################
   windows-build-and-test:
     name: Windows (MSVC)
     runs-on: windows-latest
+    env:
+      VCPKG_ROOT: ${{ github.workspace }}\vcpkg
+      OMATH_BUILD_VIA_VCPKG: ON
 
     steps:
       - name: Checkout repository (with sub-modules)
@@ -66,6 +78,12 @@ jobs:
       - name: Set up MSVC developer command-prompt
         uses: ilammy/msvc-dev-cmd@v1
 
+      - name: Set up vcpkg
+        shell: pwsh
+        run: |
+          git clone --depth 1 https://github.com/microsoft/vcpkg $env:VCPKG_ROOT
+          & "$env:VCPKG_ROOT\bootstrap-vcpkg.bat" -disableMetrics
+
       - name: Configure (cmake --preset)
         shell: bash
         run: cmake --preset windows-release -DOMATH_BUILD_TESTS=ON -DOMATH_BUILD_BENCHMARK=OFF