diff --git a/src/server/ASTViewer/ASTViewer.fsproj b/src/server/ASTViewer/ASTViewer.fsproj
index 33c2812b..7c4ce31f 100644
--- a/src/server/ASTViewer/ASTViewer.fsproj
+++ b/src/server/ASTViewer/ASTViewer.fsproj
@@ -23,7 +23,7 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Fantomas.Core" Version="6.3.0-alpha-003" />
+    <PackageReference Include="Fantomas.Core" Version="6.3.0-alpha-004" />
     <PackageReference Include="FSharp.Core" Version="6.0.6" />
     <PackageReference Include="Thoth.Json.Net" Version="8.0.0" />
   </ItemGroup>