diff --git a/.github/workflows/lang-csharp-efcore.yml b/.github/workflows/lang-csharp-efcore.yml
index 51b78584..7d6b352c 100644
--- a/.github/workflows/lang-csharp-efcore.yml
+++ b/.github/workflows/lang-csharp-efcore.yml
@@ -49,13 +49,16 @@ jobs:
         npgsql-version: [
           '8.*',
           '9.*',
-          # error: NU1202: Package Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0-rc.2
-          # is not compatible with net9.0 (.NETCoreApp,Version=v9.0).
-          # Package Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0-rc.2 supports: net10.0
-          # 'prerelease',
         ]
         cratedb-version: [ 'nightly' ]
 
+        # Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0 needs .NET10.
+        include:
+          - dotnet-version: '10.x'
+            npgsql-version: '10.*'
+          - dotnet-version: '10.x'
+            npgsql-version: 'prerelease'
+
     # https://docs.github.com/en/free-pro-team@latest/actions/guides/about-service-containers
     services:
       cratedb:
diff --git a/.github/workflows/lang-csharp-npgsql.yml b/.github/workflows/lang-csharp-npgsql.yml
index a93b4a6f..cefb7d39 100644
--- a/.github/workflows/lang-csharp-npgsql.yml
+++ b/.github/workflows/lang-csharp-npgsql.yml
@@ -49,6 +49,7 @@ jobs:
         npgsql-version: [
           '8.*',
           '9.*',
+          '10.*',
           'prerelease',
         ]
         cratedb-version: [ 'nightly' ]
diff --git a/by-language/csharp-efcore/demo.csproj b/by-language/csharp-efcore/demo.csproj
index 0f201ba3..2d0d0f13 100644
--- a/by-language/csharp-efcore/demo.csproj
+++ b/by-language/csharp-efcore/demo.csproj
@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
diff --git a/by-language/csharp-npgsql/demo.csproj b/by-language/csharp-npgsql/demo.csproj
index 56f8c80d..13120737 100644
--- a/by-language/csharp-npgsql/demo.csproj
+++ b/by-language/csharp-npgsql/demo.csproj
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="9.0.4" />
+    <PackageReference Include="Npgsql" Version="10.0.0" />
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="xunit" Version="2.9.3" />