diff --git a/src/PdfHandler.Infrastructure/PdfHandler.Infrastructure.csproj b/src/PdfHandler.Infrastructure/PdfHandler.Infrastructure.csproj
index 40a90aa..c17ab5f 100644
--- a/src/PdfHandler.Infrastructure/PdfHandler.Infrastructure.csproj
+++ b/src/PdfHandler.Infrastructure/PdfHandler.Infrastructure.csproj
@@ -26,7 +26,7 @@
     <PackageReference Include="PdfSharp" Version="6.1.1" />
     
     <!-- 既存のパッケージ（保持） -->
-    <PackageReference Include="System.Drawing.Common" Version="8.0.0" />
+    <PackageReference Include="System.Drawing.Common" Version="8.0.27" />
     <PackageReference Include="Docnet.Core" Version="2.6.0" />
     
     <!-- Supabase統合 -->