diff --git a/.github/workflows/actions.yml b/.github/workflows/actions.yml
index 5552ab6..f1675bd 100644
--- a/.github/workflows/actions.yml
+++ b/.github/workflows/actions.yml
@@ -64,7 +64,7 @@ jobs:
       - name: ✍🏻 Create .HA_VERSION file
         run: |
           mkdir -p ${{ matrix.target.path }}
-          echo "3000.1.1" > ${{ matrix.target.path }}/.HA_VERSION
+          echo "2026.10.0" > ${{ matrix.target.path }}/.HA_VERSION
 
       - name: 🏃‍♀️ Run the downloader
         run: bash ./get
@@ -91,6 +91,11 @@ jobs:
           - { current: "2022.1.1", target: "2023.1.1", result: 1 }
           - { current: "2022.1.1", target: "2023.1.3", result: 1 }
           - { current: "2023.12.0", target: "2023.1.3", result: 1 }
+          - { current: "2026.10.5", target: "2023.1.1", result: 0 }
+          - { current: "2026.11.0", target: "2023.1.1", result: 1 }
+          - { current: "2026.11.0b0", target: "2023.1.1", result: 1 }
+          - { current: "2026.12.0.dev20261101", target: "2023.1.1", result: 1 }
+          - { current: "2027.1.0", target: "2023.1.1", result: 1 }
 
     steps:
       - name: Checkout the repository
@@ -133,4 +138,42 @@ jobs:
         run: |
           if [ -f "${{ matrix.target.path }}/custom_components/hacs.zip" ]; then
             exit 1
-          fi
\ No newline at end of file
+          fi
+
+  marketplace:
+    needs: lint
+    name: Validate Marketplace message for ${{ matrix.version.current }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version:
+          - { current: "2026.11.0", url: "https://www.home-assistant.io/integrations/marketplace" }
+          - { current: "2026.11.0b1", url: "https://rc.home-assistant.io/integrations/marketplace" }
+          - { current: "2026.12.0.dev20261101", url: "https://next.home-assistant.io/integrations/marketplace" }
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v6.0.3
+
+      - name: Create .HA_VERSION file
+        run: echo "${{ matrix.version.current }}" > .HA_VERSION
+
+      - name: Run the script and check result
+        run: |
+          set +e
+          output=$(bash ./get 2>&1)
+          result=$?
+          set -e
+          echo "$output"
+          if [ "$result" != 1 ]; then
+            exit 1
+          fi
+          if ! echo "$output" | grep -qF "${{ matrix.version.url }}"; then
+            exit 1
+          fi
+
+      - name: 👀 Verify nothing was downloaded
+        run: |
+          if [ -e "./custom_components" ]; then
+            exit 1
+          fi
diff --git a/get b/get
index 9156d6f..b6b538e 100644
--- a/get
+++ b/get
@@ -19,6 +19,7 @@ function run() {
         "/usr/share/hassio/homeassistant"
     )
     declare currentVersion
+    declare marketplaceDocs
     declare currentYear
     declare currentMonth
     declare currentPatch
@@ -53,6 +54,21 @@ function run() {
 
     if [ -n "$haPath" ]; then
         info "Found Home Assistant configuration directory at '$haPath'"
+        currentVersion=$(cat "$haPath/.HA_VERSION")
+        currentYear=$(echo "${currentVersion}" | cut -d "." -f 1)
+        currentMonth=$(echo "${currentVersion}" | cut -d "." -f 2)
+
+        if [ "${currentYear}" -gt 2026 ] || { [ "${currentYear}" -eq 2026 ] && [ "${currentMonth}" -ge 11 ]; }; then
+            if [[ "${currentVersion}" == *dev* ]]; then
+                marketplaceDocs="https://next.home-assistant.io/integrations/marketplace"
+            elif [[ "${currentVersion}" == *b* ]]; then
+                marketplaceDocs="https://rc.home-assistant.io/integrations/marketplace"
+            else
+                marketplaceDocs="https://www.home-assistant.io/integrations/marketplace"
+            fi
+            error "HACS does not work on Home Assistant 2026.11 and newer (found ${currentVersion}), as it has been replaced by the native Marketplace integration. See ${marketplaceDocs}"
+        fi
+
         cd "$haPath" || error "Could not change path to $haPath"
         if [ ! -d "$haPath/custom_components" ]; then
             info "Creating custom_components directory..."
@@ -81,7 +97,6 @@ function run() {
         echo
         info "Verifying versions"
         targetVersion=$(sed -n -e '/^MINIMUM_HA_VERSION/p' "$haPath/custom_components/hacs/const.py" | cut -d '"' -f 2)
-        currentVersion=$(cat "$haPath/.HA_VERSION")
 
         info "Current version is ${currentVersion}, minimum version is ${targetVersion}"