diff --git a/devtools/conda-envs/test_env.yaml b/devtools/conda-envs/test_env.yaml
index 0dfed71..cb12fd9 100644
--- a/devtools/conda-envs/test_env.yaml
+++ b/devtools/conda-envs/test_env.yaml
@@ -6,6 +6,7 @@ dependencies:
     # Base depends
   - python
   - pip
+  - beautifulsoup4
 
     # Testing
   - pytest
diff --git a/pyproject.toml b/pyproject.toml
index 87f24b4..2ab8fe3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,9 +17,10 @@ classifiers = [
 ]
 requires-python = ">=3.8"
 # Declare any run-time dependencies that should be installed with the package.
-#dependencies = [
-#    "importlib-resources;python_version<'3.10'",
-#]
+dependencies = [
+#   "importlib-resources;python_version<'3.10'",
+    "beautifulsoup4>=4.11.0",
+]
 
 [project.urls]
 "Source" = "https://github.com/choderalab/fluorescence-assay"