diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 15636d0..b047634 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,6 +65,7 @@ jobs:
       - name: Install stable
         uses: dtolnay/rust-toolchain@stable
         with:
+          toolchain: 1.75.0 # to support Windows 7
           target: x86_64-pc-windows-msvc
       - name: Build
         run: cargo build --verbose
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cefd565..1076b24 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,6 +53,7 @@ jobs:
       - if: matrix.os == 'windows-latest'
         uses: dtolnay/rust-toolchain@stable
         with:
+          toolchain: 1.75.0 # to support Windows 7
           target: x86_64-pc-windows-msvc
 
       - if: matrix.os != 'windows-latest'