diff --git a/api/src/ProposalSystem.Api/ProposalSystem.Api.csproj b/api/src/ProposalSystem.Api/ProposalSystem.Api.csproj
index 8cdd143..ff2c653 100644
--- a/api/src/ProposalSystem.Api/ProposalSystem.Api.csproj
+++ b/api/src/ProposalSystem.Api/ProposalSystem.Api.csproj
@@ -25,7 +25,7 @@
 
   <ItemGroup>
     <PackageReference Include="Amazon.Lambda.AspNetCoreServer.Hosting" Version="2.2.1" />
-    <PackageReference Include="AWSSDK.Extensions.NETCore.Setup" Version="3.7.400.2" />
+    <PackageReference Include="AWSSDK.Extensions.NETCore.Setup" Version="4.0.101" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.30" />
     <PackageReference Include="FluentValidation.AspNetCore" Version="11.3.1" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.30" />
diff --git a/api/src/ProposalSystem.Infrastructure/ProposalSystem.Infrastructure.csproj b/api/src/ProposalSystem.Infrastructure/ProposalSystem.Infrastructure.csproj
index b24040f..aea850d 100644
--- a/api/src/ProposalSystem.Infrastructure/ProposalSystem.Infrastructure.csproj
+++ b/api/src/ProposalSystem.Infrastructure/ProposalSystem.Infrastructure.csproj
@@ -11,15 +11,15 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.513.4" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="4.0.103.4" />
     <PackageReference Include="FluentValidation" Version="12.1.1" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.11" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.30" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.30" />
-    <PackageReference Include="AWSSDK.S3" Version="3.7.511.8" />
-    <PackageReference Include="AWSSDK.SimpleEmailV2" Version="3.7.509.10" />
-    <PackageReference Include="AWSSDK.SQS" Version="3.7.502.57" />
-    <PackageReference Include="AWSSDK.SecretsManager" Version="3.7.504.43" />
+    <PackageReference Include="AWSSDK.S3" Version="4.0.102.3" />
+    <PackageReference Include="AWSSDK.SimpleEmailV2" Version="4.0.103" />
+    <PackageReference Include="AWSSDK.SQS" Version="4.0.100.10" />
+    <PackageReference Include="AWSSDK.SecretsManager" Version="4.0.100.10" />
   </ItemGroup>
 
 </Project>
diff --git a/api/src/ProposalSystem.Infrastructure/Services/SiteService.cs b/api/src/ProposalSystem.Infrastructure/Services/SiteService.cs
index 7098fb2..c68fd1d 100644
--- a/api/src/ProposalSystem.Infrastructure/Services/SiteService.cs
+++ b/api/src/ProposalSystem.Infrastructure/Services/SiteService.cs
@@ -32,7 +32,7 @@ public class SiteService : ISiteService
 
         var response = await _dynamo.ScanAsync(request, ct);
 
-        return response.Items
+        return (response.Items ?? [])
             .Select(item => new SiteResponse(
                 GetString(item, "siteCode") ?? "",
                 GetString(item, "fullAddress"),