diff --git a/.github/workflows/dotnet-tests.yml b/.github/workflows/dotnet-tests.yml
index 556c2711..1c584eb1 100644
--- a/.github/workflows/dotnet-tests.yml
+++ b/.github/workflows/dotnet-tests.yml
@@ -36,4 +36,6 @@ jobs:
 
       - name: Run tests (detailed)
         run: |
-          dotnet test src/Voucherify.Test/Voucherify.Test.csproj
+          dotnet test src/Voucherify.Test/Voucherify.Test.csproj -p:VoucherifyLibTfm=netstandard2.0
+          dotnet test src/Voucherify.Test/Voucherify.Test.csproj -p:VoucherifyLibTfm=netstandard2.1
+          dotnet test src/Voucherify.Test/Voucherify.Test.csproj -p:VoucherifyLibTfm=net9.0
diff --git a/Dockerfile b/Dockerfile
index aac72c7b..03847c88 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,9 @@ WORKDIR /app
 
 # Copy the source code
 COPY ./src ./src
+COPY ./lib ./lib
 
 # Run the tests with detailed logging and check the results
-CMD dotnet test src/Voucherify.Test/Voucherify.Test.csproj -l "console;verbosity=detailed" | \
+CMD dotnet test src/Voucherify.Test/Voucherify.Test.csproj -p:VoucherifyLibTfm=net9.0 -l "console;verbosity=detailed" | \
     tee test_results.txt && \
     grep -E "failed: 0.*skipped: 0" test_results.txt || (echo "Tests failed or were skipped!" && exit 1)
diff --git a/src/Voucherify.Test/Voucherify.Test.csproj b/src/Voucherify.Test/Voucherify.Test.csproj
index c94d2d53..73789f7a 100644
--- a/src/Voucherify.Test/Voucherify.Test.csproj
+++ b/src/Voucherify.Test/Voucherify.Test.csproj
@@ -5,6 +5,8 @@
     <RootNamespace>Voucherify.Test</RootNamespace>
     <TargetFramework>net9.0</TargetFramework>
     <IsPackable>false</IsPackable>
+    <VoucherifyLibTfm Condition="'$(VoucherifyLibTfm)' == ''">net9.0</VoucherifyLibTfm>
+    <VoucherifyLibRoot>$(MSBuildThisFileDirectory)../../lib</VoucherifyLibRoot>
   </PropertyGroup>
 
   <ItemGroup>
@@ -19,7 +21,32 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\Voucherify\Voucherify.csproj" />
+    <Reference Include="Voucherify">
+      <HintPath>$(VoucherifyLibRoot)/$(VoucherifyLibTfm)/Voucherify.dll</HintPath>
+      <Private>true</Private>
+    </Reference>
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(VoucherifyLibTfm)' == 'netstandard2.0' Or '$(VoucherifyLibTfm)' == 'netstandard2.1'">
+    <PackageReference Include="JsonSubTypes" Version="2.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="RestSharp" Version="112.0.0" />
+    <PackageReference Include="Polly" Version="8.1.0" />
+    <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(VoucherifyLibTfm)' == 'net9.0'">
+    <PackageReference Include="JsonSubTypes" Version="2.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="RestSharp" Version="112.0.0" />
+    <PackageReference Include="Polly" Version="8.1.0" />
+    <PackageReference Include="Polly.Extensions.Http" Version="3.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.10" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="9.0.10" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.10" />
+  </ItemGroup>
+
+  <ItemGroup>
     <Compile Remove="**\*.cs" />
     <Compile Include="src\**\*.cs" />
   </ItemGroup>
@@ -35,4 +62,9 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
+
+  <Target Name="ValidateVoucherifyLibTfm" BeforeTargets="ResolveReferences">
+    <Error Condition="'$(VoucherifyLibTfm)' != 'netstandard2.0' And '$(VoucherifyLibTfm)' != 'netstandard2.1' And '$(VoucherifyLibTfm)' != 'net9.0'"
+           Text="VoucherifyLibTfm must be one of: netstandard2.0, netstandard2.1, net9.0." />
+  </Target>
 </Project>