diff --git a/backend/Contexture.Api.Tests/Contexture.Api.Tests.fsproj b/backend/Contexture.Api.Tests/Contexture.Api.Tests.fsproj
index ff8ca03..0309b54 100644
--- a/backend/Contexture.Api.Tests/Contexture.Api.Tests.fsproj
+++ b/backend/Contexture.Api.Tests/Contexture.Api.Tests.fsproj
@@ -39,7 +39,8 @@
         </PackageReference>
         <PackageReference Update="FSharp.Core" Version="7.0.300" />
         <PackageReference Include="NStore.Persistence.MsSql" Version="0.14.0" />
-        <PackageReference Include="Testcontainers" Version="2.4.0" />
+        <PackageReference Include="Testcontainers" Version="4.0.0" />
+        <PackageReference Include="Testcontainers.MsSql" Version="4.0.0" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/backend/Contexture.Api.Tests/EventStore.Tests.fs b/backend/Contexture.Api.Tests/EventStore.Tests.fs
index 90f73a3..5cb347b 100644
--- a/backend/Contexture.Api.Tests/EventStore.Tests.fs
+++ b/backend/Contexture.Api.Tests/EventStore.Tests.fs
@@ -264,7 +264,7 @@ type MsSqlBackedEventStore(msSql: MsSqlFixture) =
             let config =
                 MsSqlPersistenceOptions(
                     loggerFactory,
-                    ConnectionString = msSql.Container.ConnectionString,
+                    ConnectionString = msSql.Container.GetConnectionString(),
                     StreamsTableName = $"streams_{Interlocked.Increment(counter)}_{this.GetType().Name}",
                     Serializer = NStoreBased.JsonMsSqlSerializer.Default
                 )
diff --git a/backend/Contexture.Api.Tests/PositionStorage.Tests.fs b/backend/Contexture.Api.Tests/PositionStorage.Tests.fs
index 6ea6b45..c40aff3 100644
--- a/backend/Contexture.Api.Tests/PositionStorage.Tests.fs
+++ b/backend/Contexture.Api.Tests/PositionStorage.Tests.fs
@@ -81,10 +81,10 @@ type SqlServerPositionStorage(msSql: MsSqlFixture) =
     inherit PositionStorageBehavior()
 
     override this.EmptyStorage() =
-        SqlServer.PositionStorage(msSql.Container.ConnectionString)
+        SqlServer.PositionStorage(msSql.Container.GetConnectionString())
         
     override this.StorageWith items = task {
-        use client = new SqlConnection(msSql.Container.ConnectionString)
+        use client = new SqlConnection(msSql.Container.GetConnectionString())
         do! client.OpenAsync()
         
         // using string concatenation over parameters here is OK because it's just (unit) test code
@@ -98,15 +98,15 @@ type SqlServerPositionStorage(msSql: MsSqlFixture) =
         let! result = command.ExecuteNonQueryAsync()
         Assert.Equal(items |> List.length, result)
         
-        return SqlServer.PositionStorage(msSql.Container.ConnectionString) :> IStorePositions
+        return SqlServer.PositionStorage(msSql.Container.GetConnectionString()) :> IStorePositions
         }
 
     interface IAsyncLifetime with
         member this.DisposeAsync() =
-            SqlServer.PositionStorage.RemoveSchema(msSql.Container.ConnectionString)
+            SqlServer.PositionStorage.RemoveSchema(msSql.Container.GetConnectionString())
 
         member this.InitializeAsync() =
-            SqlServer.PositionStorage.CreateSchema(msSql.Container.ConnectionString)
+            SqlServer.PositionStorage.CreateSchema(msSql.Container.GetConnectionString())
 
     interface IClassFixture<MsSqlFixture> with
 
diff --git a/backend/Contexture.Api.Tests/SqlServerFixture.fs b/backend/Contexture.Api.Tests/SqlServerFixture.fs
index 11d95a5..a793eb2 100644
--- a/backend/Contexture.Api.Tests/SqlServerFixture.fs
+++ b/backend/Contexture.Api.Tests/SqlServerFixture.fs
@@ -1,27 +1,20 @@
 namespace Contexture.Api.Tests
 
-#nowarn "44" // ContainerBuilder<MsSqlTestcontainer>() is deprecated but does not provide a clear guidance yet
-
 open System
 open System.Threading
-open DotNet.Testcontainers.Builders
-open DotNet.Testcontainers.Configurations
-open DotNet.Testcontainers.Containers
+open Testcontainers.MsSql
 open Xunit
 
 type MsSqlFixture() =
     static let mutable counter = ref 0
-    let container =
+    let container =   
         let containerConfiguration =
-            ContainerBuilder<MsSqlTestcontainer>()
-                .WithDatabase(new MsSqlTestcontainerConfiguration(Password = "localdevpassword#123"))
-                .WithImage("mcr.microsoft.com/mssql/server:2019-latest")
+            MsSqlBuilder()
                 .WithName($"MS-SQL-Integration-Tests-{Interlocked.Increment counter}")
                 .WithCleanUp(false)
                 .WithAutoRemove(true)
 
-        let instance = containerConfiguration.Build()
-        instance
+        containerConfiguration.Build()
 
     member _.Container = container