diff --git a/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj b/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
index adb328120..a722b7b70 100644
--- a/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
+++ b/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
@@ -32,8 +32,8 @@
 
   <ItemGroup>
     <PackageReference Include="DiffLib" Version="1.0.0.55" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="2.3.2" />
-    <PackageReference Include="System.Collections.Immutable" Version="1.4.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="2.4.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="1.3.1" />
     <PackageReference Include="NUnit" Version="2.6.3" />
     <PackageReference Include="NUnitTestAdapter" Version="2.0.0" />
   </ItemGroup>
diff --git a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
index 764707c72..fd5d7f1b7 100644
--- a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
+++ b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
@@ -51,8 +51,8 @@
   <ItemGroup>
     <PackageReference Include="Humanizer.Core" Version="2.2.0" />
     <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
-    <PackageReference Include="System.Collections.Immutable" Version="1.4.0" />
-    <PackageReference Include="System.ValueTuple" Version="4.4.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="1.3.1" />
+    <PackageReference Include="System.ValueTuple" Version="4.3.0" />
   </ItemGroup>
 
   <ItemGroup>