diff --git a/pyproject.toml b/pyproject.toml
index 95fbfbe..6607883 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
     "gemma@git+https://github.com/google-deepmind/gemma.git",
     "google-cloud-aiplatform",
     "google-generativeai",
+    "html5lib",
     "immutabledict",
     "jinja2",
     "numpy",