diff --git a/src/Bonsai.ML.HiddenMarkovModels/Bonsai.ML.HiddenMarkovModels.csproj b/src/Bonsai.ML.HiddenMarkovModels/Bonsai.ML.HiddenMarkovModels.csproj
index 2e3591ac..f245742e 100644
--- a/src/Bonsai.ML.HiddenMarkovModels/Bonsai.ML.HiddenMarkovModels.csproj
+++ b/src/Bonsai.ML.HiddenMarkovModels/Bonsai.ML.HiddenMarkovModels.csproj
@@ -8,6 +8,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Bonsai.Core" Version="2.8.1" />
+    <PackageReference Include="Bonsai.Scripting.Expressions" Version="2.8.0" />
     <PackageReference Include="Bonsai.Scripting.Python" Version="0.2.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>