diff --git a/.github/actions/setup-opensuse/action.yml b/.github/actions/setup-opensuse/action.yml
new file mode 100644
index 00000000..90de5229
--- /dev/null
+++ b/.github/actions/setup-opensuse/action.yml
@@ -0,0 +1,25 @@
+name: "Setup openSUSE Tumbleweed Snapshot"
+description: "Configures zypper to use a stable historical snapshot to bypass CDN flakiness"
+runs:
+  using: "composite"
+  steps:
+    - name: Fetch latest stable snapshot date
+      uses: actions/github-script@v9
+      id: get-snapshot
+      with:
+        script: |
+          const response = await fetch("https://openqa.opensuse.org/api/v1/job_groups/1/build_results");
+          const data = await response.json();
+          // Use index 2 (the 3rd most recent snapshot, roughly 2-3 days old)
+          // to ensure all global mirrors have fully synced the RPM packages.
+          // This avoids 404s/timeouts on regional mirrors that lag behind
+          // live releases.
+          return data.build_results[2].build;
+        result-encoding: string
+    - name: Setup openSUSE snapshot repository
+      shell: bash
+      run: |
+        SNAPSHOT="${{ steps.get-snapshot.outputs.result }}"
+        echo "Using snapshot: $SNAPSHOT"
+        zypper rr --all
+        zypper ar -f http://download.opensuse.org/history/$SNAPSHOT/tumbleweed/repo/oss/ repo-oss
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 042a991a..85b3ac2c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -42,6 +42,9 @@ jobs:
       image: opensuse/tumbleweed
 
     steps:
+    - uses: actions/checkout@v6
+    - name: Setup openSUSE snapshot repository
+      uses: ./.github/actions/setup-opensuse
     - run: |
         ${{ env.RETRY }} zypper -n install \
           binutils clang${{ matrix.llvm }}-devel cmake flex gcc-c++ llvm${{ matrix.llvm }}-devel \
@@ -55,7 +58,6 @@ jobs:
         make-default: false
     - run: ld --version
     - run: nproc
-    - uses: actions/checkout@v6
     - name: build
       run: |
             mkdir objdir
@@ -131,8 +133,10 @@ jobs:
       image: opensuse/tumbleweed
 
     steps:
-    - run: ${{ env.RETRY }} zypper -n install python3-pip
     - uses: actions/checkout@v6
+    - name: Setup openSUSE snapshot repository
+      uses: ./.github/actions/setup-opensuse
+    - run: ${{ env.RETRY }} zypper -n install python3-pip
     - run: ${{ env.RETRY }} pip install --break-system-packages ruff
     - run: ruff check
     - run: ruff format --diff
@@ -144,8 +148,10 @@ jobs:
       image: opensuse/tumbleweed
 
     steps:
-    - run: ${{ env.RETRY }} zypper -n install binutils clang-devel cmake flex gcc-c++ llvm-devel python312
     - uses: actions/checkout@v6
+    - name: Setup openSUSE snapshot repository
+      uses: ./.github/actions/setup-opensuse
+    - run: ${{ env.RETRY }} zypper -n install binutils clang-devel cmake flex gcc-c++ llvm-devel python312
     - name: prepare venv
       # Pytype currently only supports Python <=3.12
       run: |
@@ -171,13 +177,15 @@ jobs:
       image: opensuse/tumbleweed
 
     steps:
+    - uses: actions/checkout@v6
+    - name: Setup openSUSE snapshot repository
+      uses: ./.github/actions/setup-opensuse
     - run: |
         ${{ env.RETRY }} zypper -n install \
           binutils clang-devel cmake flex gcc-c++ llvm-devel python3 python3-pyright \
           python3-Pebble python3-pytest python3-pytest-mock python3-pytest-subprocess \
           unifdef python3-psutil curl git python3-chardet findutils sudo wget python3-jsonschema \
           python3-msgspec python3-zstandard
-    - uses: actions/checkout@v6
     - run: mkdir objdir
     - run: cmake ..
       working-directory: objdir