diff --git a/.github/workflows/ci_macos.yaml b/.github/workflows/ci_macos.yaml
index 04e6ed20c..fe177d4fc 100644
--- a/.github/workflows/ci_macos.yaml
+++ b/.github/workflows/ci_macos.yaml
@@ -57,8 +57,8 @@ jobs:
       - name: Install boost
         env:
           BOOST_MAJOR_VERSION: "1"
-          BOOST_MINOR_VERSION: "86"
-          BOOST_PATCH_VERSION: "0"
+          BOOST_MINOR_VERSION: ${{ startsWith(matrix.libt_version, '2') && '90' || '86' }}
+          BOOST_PATCH_VERSION: ${{ startsWith(matrix.libt_version, '2') && '0' || '0' }}
         run: |
           boost_url="https://archives.boost.io/release/${{ env.BOOST_MAJOR_VERSION }}.${{ env.BOOST_MINOR_VERSION }}.${{ env.BOOST_PATCH_VERSION }}/source/boost_${{ env.BOOST_MAJOR_VERSION }}_${{ env.BOOST_MINOR_VERSION }}_${{ env.BOOST_PATCH_VERSION }}.tar.gz"
           boost_url2="https://sourceforge.net/projects/boost/files/boost/${{ env.BOOST_MAJOR_VERSION }}.${{ env.BOOST_MINOR_VERSION }}.${{ env.BOOST_PATCH_VERSION }}/boost_${{ env.BOOST_MAJOR_VERSION }}_${{ env.BOOST_MINOR_VERSION }}_${{ env.BOOST_PATCH_VERSION }}.tar.gz"
diff --git a/.github/workflows/ci_windows.yaml b/.github/workflows/ci_windows.yaml
index 11b260f9d..fba52bc9b 100644
--- a/.github/workflows/ci_windows.yaml
+++ b/.github/workflows/ci_windows.yaml
@@ -88,8 +88,8 @@ jobs:
       - name: Install boost
         env:
           BOOST_MAJOR_VERSION: "1"
-          BOOST_MINOR_VERSION: "86"
-          BOOST_PATCH_VERSION: "0"
+          BOOST_MINOR_VERSION: ${{ startsWith(matrix.libt_version, '2') && '90' || '86' }}
+          BOOST_PATCH_VERSION: ${{ startsWith(matrix.libt_version, '2') && '0' || '0' }}
         run: |
           $boost_url="https://archives.boost.io/release/${{ env.BOOST_MAJOR_VERSION }}.${{ env.BOOST_MINOR_VERSION }}.${{ env.BOOST_PATCH_VERSION }}/source/boost_${{ env.BOOST_MAJOR_VERSION }}_${{ env.BOOST_MINOR_VERSION }}_${{ env.BOOST_PATCH_VERSION }}.tar.gz"
           $boost_url2="https://sourceforge.net/projects/boost/files/boost/${{ env.BOOST_MAJOR_VERSION }}.${{ env.BOOST_MINOR_VERSION }}.${{ env.BOOST_PATCH_VERSION }}/boost_${{ env.BOOST_MAJOR_VERSION }}_${{ env.BOOST_MINOR_VERSION }}_${{ env.BOOST_PATCH_VERSION }}.tar.gz"