diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 25c07531..105d27b0 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -21,14 +21,14 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - postgresql-version-major: "14"
-            postgresql-version: "14.20-1"
-          - postgresql-version-major: "15"
-            postgresql-version: "15.15-1"
-          - postgresql-version-major: "16"
-            postgresql-version: "16.11-1"
-          - postgresql-version-major: "17"
-            postgresql-version: "17.7-1"
+          # - postgresql-version-major: "14"
+          #   postgresql-version: "14.20-1"
+          # - postgresql-version-major: "15"
+          #   postgresql-version: "15.15-1"
+          # - postgresql-version-major: "16"
+          #   postgresql-version: "16.11-1"
+          # - postgresql-version-major: "17"
+          #   postgresql-version: "17.7-1"
           - postgresql-version-major: "18"
             postgresql-version: "18.1-1"
           - groonga-main: "yes"
@@ -270,3 +270,71 @@ jobs:
           bundle exec ruby `
             -I${{ github.workspace }}\pgroonga-benchmark\lib `
             test\run-test.rb
+
+  verify-package:
+    name: Verify package
+    needs: test
+    runs-on: windows-latest
+    env:
+      PGROONGA_BENCHMARK_GEMFILE: ${{ github.workspace }}\pgroonga-benchmark\Gemfile
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6
+        with:
+          repository: pgroonga/benchmark
+          path: pgroonga-benchmark
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: release-postgresql-18-x64
+          path: artifact
+      - name: Extract package
+        run: |
+          Expand-Archive -Path artifact\*.zip -DestinationPath ..\pgsql
+      - name: Inspect package contents
+        shell: cmd
+        run: |
+          call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
+          echo === DLLs in bin directory ===
+          dir ..\pgsql\bin\*.dll
+          echo.
+          echo === DLLs in lib directory ===
+          dir ..\pgsql\lib\*.dll
+          echo.
+          echo === Checking pgroonga.dll dependencies ===
+          dumpbin /dependents ..\pgsql\lib\pgroonga.dll
+          echo.
+          echo === Checking msgpack symbols in libgroonga.dll ===
+          dumpbin /exports ..\pgsql\bin\libgroonga.dll | findstr /i msgpack
+          echo.
+          echo === Checking pgroonga.dll imports for msgpack ===
+          dumpbin /imports ..\pgsql\lib\pgroonga.dll | findstr /i msgpack
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+          bundler-cache: true
+      - name: Run PostgreSQL
+        run: |
+          $Env:PATH = "$(Get-Location)\..\pgsql\bin;${Env:PATH}"
+          ..\pgsql\bin\initdb `
+            --encoding=UTF-8 `
+            --locale=C `
+            --pgdata=test-data `
+            --username=pgroonga-test
+          Add-Content `
+            -Path test-data\postgresql.conf `
+            -Value "enable_partitionwise_join = on","max_prepared_transactions = 1","random_page_cost = 0" `
+            -Encoding utf8
+          ..\pgsql\bin\pg_ctl start --pgdata=test-data
+      - name: Run unit test
+        run: |
+          $Env:PATH = "$(Get-Location)\..\pgsql\bin;${Env:PATH}"
+          $Env:PGUSER = "pgroonga-test"
+          Remove-Item test\test-streaming-replication.rb
+          bundle exec ruby `
+            -I${{ github.workspace }}\pgroonga-benchmark\lib `
+            test\run-test.rb
+      - name: Shutdown PostgreSQL
+        if: always()
+        run: |
+          ..\pgsql\bin\pg_ctl stop --pgdata=test-data