diff --git a/conda_environment.yml b/conda_environment.yml
index 5e21a117..9dbf7e0b 100644
--- a/conda_environment.yml
+++ b/conda_environment.yml
@@ -7,5 +7,6 @@ dependencies:
   - nodejs
   - pip:
       - cwltool==3.1.20230624081518
+      - cwlref-runner
       - rocrate==0.8.0
       - ruamel-yaml==0.17.32