diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 801ab4a..7dac2b6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -342,6 +342,9 @@ jobs:
           - x86_64
           - i686
     steps:
+      - name: Install dependencies
+        run: |
+          choco install ninja
       - uses: actions/download-artifact@v3
         with:
           name: windows-ucrt-${{matrix.arch}}-toolchain
@@ -397,6 +400,9 @@ jobs:
           - { arch: i686, asmflag: }
           - { arch: x86_64, asmflag: -m64 }
     steps:
+      - name: Install dependencies
+        run: |
+          choco install ninja
       - uses: actions/download-artifact@v3
         with:
           name: windows-ucrt-${{matrix.arch}}-toolchain
@@ -458,6 +464,9 @@ jobs:
           - x86_64
           - i686
     steps:
+      - name: Install dependencies
+        run: |
+          choco install ninja
       - uses: actions/download-artifact@v3
         with:
           name: windows-ucrt-${{matrix.arch}}-toolchain
diff --git a/.github/workflows/test-libcxx.yml b/.github/workflows/test-libcxx.yml
index c88d913..17d7b62 100644
--- a/.github/workflows/test-libcxx.yml
+++ b/.github/workflows/test-libcxx.yml
@@ -48,6 +48,9 @@ jobs:
           - x86_64
           - i686
     steps:
+      - name: Install dependencies
+        run: |
+          choco install ninja
       - name: Download toolchain
         uses: dawidd6/action-download-artifact@v2
         with:
diff --git a/.github/workflows/test-llvm.yml b/.github/workflows/test-llvm.yml
index 999833a..7182c21 100644
--- a/.github/workflows/test-llvm.yml
+++ b/.github/workflows/test-llvm.yml
@@ -42,6 +42,9 @@ jobs:
     needs: [prepare]
     runs-on: windows-latest
     steps:
+      - name: Install dependencies
+        run: |
+          choco install ninja
       - name: Download toolchain
         uses: dawidd6/action-download-artifact@v2
         with: