diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 2efab05..ca511db 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -2,6 +2,10 @@ version: 2
 updates:
   - package-ecosystem: "nuget"
     directories:
+      # リポジトリ直下には CPM の Directory.Packages.props と、ローカルツール
+      # マニフェスト dotnet-tools.json がある。"/" が無いとどちらも探索対象外になる。
+      # dotnet-ef が 10.0.9 に取り残されていたのはこれが原因。
+      - "/"
       - "/src/**"
       - "/tests/**"
     schedule:
@@ -10,10 +14,40 @@ updates:
       time: "09:00"
       timezone: "Asia/Tokyo"
     target-branch: "main"
-    open-pull-requests-limit: 5
+    # 枠が埋まると更新 PR の作成が次回以降に先送りされ、しかもそれが通知されない。
+    # 実際 EFCore.SqlServer 等の 10.0.10 は長期間 PR 化されていなかった。
+    open-pull-requests-limit: 10
     commit-message:
       prefix: "deps"
       include: "scope"
+    groups:
+      # ASP.NET Core と EF Core は同一トレイン（10.0.x）で同時にリリースされる。
+      # PR が分かれると片方だけマージされてバージョンが割れるため 1 本にまとめる。
+      # dotnet-ef も同じトレインなので同居させる。
+      aspnetcore-efcore:
+        patterns:
+          - "Microsoft.AspNetCore.*"
+          - "Microsoft.EntityFrameworkCore.*"
+          - "dotnet-ef"
+        update-types:
+          - "minor"
+          - "patch"
+      # テスト基盤。src と tests で版がずれると原因の切り分けが難しくなる。
+      test-tooling:
+        patterns:
+          - "Microsoft.NET.Test.Sdk"
+          - "Microsoft.Playwright.*"
+          - "xunit*"
+          - "coverlet.*"
+        update-types:
+          - "minor"
+          - "patch"
+      azure:
+        patterns:
+          - "Azure.*"
+        update-types:
+          - "minor"
+          - "patch"
 
   - package-ecosystem: "github-actions"
     directory: "/"
@@ -23,7 +57,11 @@ updates:
       time: "09:30"
       timezone: "Asia/Tokyo"
     target-branch: "main"
-    open-pull-requests-limit: 2
+    # あえてグループ化しない。同じ action を使う複数ワークフローは Dependabot が
+    # 元から 1 PR にまとめる（#130 は setup-dotnet を 5 ファイルまとめて更新した）。
+    # ここでグループを足すと、別々の action の major 更新まで同じ PR に同居し、
+    # CI が落ちたときの切り分けが難しくなる。
+    open-pull-requests-limit: 5
     commit-message:
       prefix: "deps"
       include: "scope"
diff --git a/Directory.Packages.props b/Directory.Packages.props
new file mode 100644
index 0000000..57dc5f6
--- /dev/null
+++ b/Directory.Packages.props
@@ -0,0 +1,45 @@
+<Project>
+
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+
+  <!-- バージョンはここに literal で書く（MSBuild プロパティで束ねない）。
+       Dependabot が $(Var) 形式を解決できなかった場合、更新 PR が黙って作られなくなり、
+       CPM 導入の目的（バージョンずれの検知）と正反対の結果になるため。
+       ASP.NET Core / EF Core を同時に上げる役目は .github/dependabot.yml の
+       aspnetcore-efcore グループが担う。 -->
+
+  <ItemGroup Label="ASP.NET Core / EF Core">
+    <PackageVersion Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.10" />
+  </ItemGroup>
+
+  <ItemGroup Label="Azure">
+    <PackageVersion Include="Azure.Extensions.AspNetCore.DataProtection.Blobs" Version="1.5.3" />
+    <PackageVersion Include="Azure.Extensions.AspNetCore.DataProtection.Keys" Version="1.6.3" />
+    <PackageVersion Include="Azure.Identity" Version="1.21.0" />
+    <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.5.0" />
+  </ItemGroup>
+
+  <ItemGroup Label="Application">
+    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.12" />
+  </ItemGroup>
+
+  <ItemGroup Label="Testing">
+    <PackageVersion Include="coverlet.collector" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
+    <PackageVersion Include="Microsoft.Playwright.Xunit" Version="1.61.0" />
+    <PackageVersion Include="SQLitePCLRaw.bundle_e_sqlite3" Version="3.0.3" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/PetHealthManagement.Web/PetHealthManagement.Web.csproj b/src/PetHealthManagement.Web/PetHealthManagement.Web.csproj
index 2d50b39..b87fc71 100644
--- a/src/PetHealthManagement.Web/PetHealthManagement.Web.csproj
+++ b/src/PetHealthManagement.Web/PetHealthManagement.Web.csproj
@@ -8,17 +8,17 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Extensions.AspNetCore.DataProtection.Blobs" Version="1.5.3" />
-    <PackageReference Include="Azure.Extensions.AspNetCore.DataProtection.Keys" Version="1.6.3" />
-    <PackageReference Include="Azure.Identity" Version="1.21.0" />
-    <PackageReference Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.5.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="10.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.10" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
+    <PackageReference Include="Azure.Extensions.AspNetCore.DataProtection.Blobs" />
+    <PackageReference Include="Azure.Extensions.AspNetCore.DataProtection.Keys" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Azure.Monitor.OpenTelemetry.AspNetCore" />
+    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" />
+    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" />
+    <PackageReference Include="Microsoft.AspNetCore.Identity.UI" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" />
+    <PackageReference Include="SixLabors.ImageSharp" />
   </ItemGroup>
 
 </Project>
diff --git a/tests/PetHealthManagement.Web.E2ETests/PetHealthManagement.Web.E2ETests.csproj b/tests/PetHealthManagement.Web.E2ETests/PetHealthManagement.Web.E2ETests.csproj
index 5932fd7..56e40a1 100644
--- a/tests/PetHealthManagement.Web.E2ETests/PetHealthManagement.Web.E2ETests.csproj
+++ b/tests/PetHealthManagement.Web.E2ETests/PetHealthManagement.Web.E2ETests.csproj
@@ -15,13 +15,13 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.10" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
-    <PackageReference Include="Microsoft.Playwright.Xunit" Version="1.61.0" />
-    <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageReference Include="coverlet.collector" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="Microsoft.Playwright.Xunit" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/tests/PetHealthManagement.Web.Tests/PetHealthManagement.Web.Tests.csproj b/tests/PetHealthManagement.Web.Tests/PetHealthManagement.Web.Tests.csproj
index b425633..1c757e6 100644
--- a/tests/PetHealthManagement.Web.Tests/PetHealthManagement.Web.Tests.csproj
+++ b/tests/PetHealthManagement.Web.Tests/PetHealthManagement.Web.Tests.csproj
@@ -15,14 +15,14 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.10" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
-    <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="3.0.3" />
-    <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageReference Include="coverlet.collector" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" />
   </ItemGroup>
 
   <ItemGroup>