diff --git a/environment.yml b/environment.yml
index 259518f60..9126b452c 100644
--- a/environment.yml
+++ b/environment.yml
@@ -35,6 +35,7 @@ dependencies:
   - plugcli
   - tqdm
   - pygraphviz
+  - zstandard
   # Issue #443
   - pymbar<4.0
   # docs