diff --git a/tests/FMData.Rest.Tests/FMData.Rest.Tests.csproj b/tests/FMData.Rest.Tests/FMData.Rest.Tests.csproj
index 136c333..d6f9d8b 100644
--- a/tests/FMData.Rest.Tests/FMData.Rest.Tests.csproj
+++ b/tests/FMData.Rest.Tests/FMData.Rest.Tests.csproj
@@ -47,7 +47,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.0" />
-    <PackageReference Include="moq" Version="4.20.0" />
+    <PackageReference Include="moq" Version="4.18.4" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
     <PackageReference Include="xunit.runner.console" Version="2.5.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
diff --git a/tests/FMData.Xml.Tests/FMData.Xml.Tests.csproj b/tests/FMData.Xml.Tests/FMData.Xml.Tests.csproj
index 3049a9f..6c14edf 100644
--- a/tests/FMData.Xml.Tests/FMData.Xml.Tests.csproj
+++ b/tests/FMData.Xml.Tests/FMData.Xml.Tests.csproj
@@ -12,7 +12,7 @@
   
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.0" />
-    <PackageReference Include="moq" Version="4.20.0" />
+    <PackageReference Include="moq" Version="4.18.4" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
     <PackageReference Include="xunit.runner.console" Version="2.5.0" />