diff --git a/environment-wasm.yml b/environment-wasm.yml
index 4db4342d8..d8aff9777 100644
--- a/environment-wasm.yml
+++ b/environment-wasm.yml
@@ -8,3 +8,4 @@ dependencies:
   - xeus
   - cpp-argparse
   - pugixml
+  - doctest
\ No newline at end of file