diff --git a/.github/workflows/swift-toolchain.yml b/.github/workflows/swift-toolchain.yml
index 161bca86d..192a9b535 100644
--- a/.github/workflows/swift-toolchain.yml
+++ b/.github/workflows/swift-toolchain.yml
@@ -309,6 +309,7 @@ jobs:
         with:
           setup-vs-dev-env: true
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
@@ -388,6 +389,7 @@ jobs:
         if: inputs.build_android
         with:
           setup-vs-dev-env: true
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - name: Compute workspace hash
         if: inputs.build_android
@@ -495,6 +497,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - name: Compute workspace hash
         if: inputs.build_android
@@ -602,6 +605,7 @@ jobs:
         with:
           setup-vs-dev-env: true
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -683,6 +687,7 @@ jobs:
         with:
           setup-vs-dev-env: true
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -1278,6 +1283,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -1368,6 +1374,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -1459,6 +1466,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -1646,6 +1654,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
       - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
         if: inputs.build_os == 'Darwin'
 
@@ -2812,6 +2821,7 @@ jobs:
         with:
           setup-vs-dev-env: ${{ matrix.os == 'Windows' }}
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - name: Compute workspace hash
         id: workspace_hash
@@ -4632,6 +4642,7 @@ jobs:
       - uses: ./SourceCache/ci-build/.github/actions/setup-build
         with:
           setup-vs-dev-env: true
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - uses: thebrowsercompany/gha-download-tar-artifact@59992d91335d4ecba543c8535f7d07238e42125d # main
         with:
@@ -5130,6 +5141,7 @@ jobs:
         uses: ./SourceCache/ci-build/.github/actions/setup-build
         with:
           setup-vs-dev-env: true
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - if: inputs.build_android
         uses: thebrowsercompany/gha-download-tar-artifact@59992d91335d4ecba543c8535f7d07238e42125d # main
@@ -5379,6 +5391,7 @@ jobs:
         with:
           setup-vs-dev-env: true
           host-arch: ${{ matrix.arch }}
+          swift-version: ${{ env.PINNED_BOOTSTRAP_TOOLCHAIN_VERSION }}
 
       - uses: actions/download-artifact@v4
         with: