diff --git a/.github/workflows/ci-pr.yml b/.github/workflows/ci-pr.yml
index 913fc63..595bfd4 100644
--- a/.github/workflows/ci-pr.yml
+++ b/.github/workflows/ci-pr.yml
@@ -34,7 +34,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.301
+          dotnet-version: 10.0.401
 
       - name: Restore
         run: dotnet restore FSharp.MongoDB.sln
diff --git a/.github/workflows/on-push-branch.yml b/.github/workflows/on-push-branch.yml
index b07aa11..0130016 100644
--- a/.github/workflows/on-push-branch.yml
+++ b/.github/workflows/on-push-branch.yml
@@ -29,7 +29,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.301
+          dotnet-version: 10.0.401
 
       - name: Restore
         run: dotnet restore FSharp.MongoDB.sln
diff --git a/.github/workflows/on-push-tag.yml b/.github/workflows/on-push-tag.yml
index ace92d6..41e7430 100644
--- a/.github/workflows/on-push-tag.yml
+++ b/.github/workflows/on-push-tag.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.301
+          dotnet-version: 10.0.401
 
       - name: Extract version suffix
         run: |
diff --git a/.github/workflows/on-release-published.yml b/.github/workflows/on-release-published.yml
index 8ae6849..6a346c6 100644
--- a/.github/workflows/on-release-published.yml
+++ b/.github/workflows/on-release-published.yml
@@ -18,7 +18,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.301
+          dotnet-version: 10.0.401
 
       - name: Download GitHub release artifacts
         uses: robinraju/release-downloader@v1.11
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5cb708..2679f88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to FSharp.MongoDB are documented in this file.
 
 ## [Unreleased]
 
+- Updated the required .NET SDK and all GitHub Actions workflows to `10.0.401`.
+- Updated MongoDB.Bson from `3.6.0` to `3.12.0` across the library and test projects.
+- Updated test dependencies to FsUnit `8.0.0`, NUnit `5.0.0`, NUnit3TestAdapter `6.3.1`, and Microsoft.NET.Test.Sdk `18.11.0`.
+
 ## [0.6.0-beta]
 
 
diff --git a/README.md b/README.md
index 7dc0e7f..dcd83f8 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ Repository origins are:
   1. This repository: migrated to netstandard 2.1, nullable, adds new features (C#/F# isomomorphic serialization, voption support...)
   
 ## Building
+  * install .NET SDK `10.0.401` as specified in `global.json`.
   * build using the top-level solution file (`FSharp.MongoDB.sln`).
   * you can use `make` with target `build` or `test`.
 
@@ -23,7 +24,7 @@ Repository origins are:
 
 This project targets `.net 8`, `.net 9`, `.net 10` and  `netstandard2.1` ([compatible runtimes](https://learn.microsoft.com/en-us/dotnet/standard/net-standard?tabs=net-standard-2-1#select-net-standard-version))
 
-:warning: NRT support starts with `.net sdk 9.0.200`. F# compiler in .net sdk 9.0.10x does not set correctly nullable attributes on F# types. NRT are not supported on `netstandard2.1`. Anyway, it's better to use latest `.net sdk 10.0.301` at least.
+:warning: NRT support starts with `.net sdk 9.0.200`. F# compiler in .net sdk 9.0.10x does not set correctly nullable attributes on F# types. NRT are not supported on `netstandard2.1`. Anyway, it's better to use latest `.net sdk 10.0.401` at least.
 
 ## Contributing
   * If you have a question about the library, then create an [issue][issues] with the `question` label.
diff --git a/global.json b/global.json
index c80d610..9c96e4c 100644
--- a/global.json
+++ b/global.json
@@ -1,5 +1,5 @@
 {
     "sdk": {
-      "version": "10.0.301"
+      "version": "10.0.401"
     }
   }
diff --git a/src/FSharp.MongoDB.Bson/FSharp.MongoDB.Bson.fsproj b/src/FSharp.MongoDB.Bson/FSharp.MongoDB.Bson.fsproj
index a80c9dd..fdfb0f2 100644
--- a/src/FSharp.MongoDB.Bson/FSharp.MongoDB.Bson.fsproj
+++ b/src/FSharp.MongoDB.Bson/FSharp.MongoDB.Bson.fsproj
@@ -26,7 +26,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MongoDB.Bson" Version="3.6.0" />
+    <PackageReference Include="MongoDB.Bson" Version="3.12.0" />
   </ItemGroup>
 
   <PropertyGroup>
diff --git a/tests/CSharpDataModels/CSharpDataModels.csproj b/tests/CSharpDataModels/CSharpDataModels.csproj
index d191cb5..5abb535 100644
--- a/tests/CSharpDataModels/CSharpDataModels.csproj
+++ b/tests/CSharpDataModels/CSharpDataModels.csproj
@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="MongoDB.Bson" Version="3.6.0" />
+        <PackageReference Include="MongoDB.Bson" Version="3.12.0" />
     </ItemGroup>
 
 </Project>
diff --git a/tests/FSharp.MongoDB.Bson.Tests/FSharp.MongoDB.Bson.Tests.fsproj b/tests/FSharp.MongoDB.Bson.Tests/FSharp.MongoDB.Bson.Tests.fsproj
index 5d3793a..e72bd26 100644
--- a/tests/FSharp.MongoDB.Bson.Tests/FSharp.MongoDB.Bson.Tests.fsproj
+++ b/tests/FSharp.MongoDB.Bson.Tests/FSharp.MongoDB.Bson.Tests.fsproj
@@ -27,11 +27,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FsUnit" Version="7.1.1" />
-    <PackageReference Include="NUnit" Version="4.4.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageReference Include="MongoDB.Bson" Version="3.6.0" />
+    <PackageReference Include="FsUnit" Version="8.0.0" />
+    <PackageReference Include="NUnit" Version="5.0.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.3.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
+    <PackageReference Include="MongoDB.Bson" Version="3.12.0" />
   </ItemGroup>
 
 </Project>