diff --git a/environment-wasm-host.yml b/environment-wasm-host.yml
index 5fe68e6d..d356cd2f 100644
--- a/environment-wasm-host.yml
+++ b/environment-wasm-host.yml
@@ -15,3 +15,4 @@ dependencies:
   - pyjs>=2.0.0
   - requests-wasm-polyfill>=0.3.0
   - libpython
+  - zstd