diff --git a/environment.yml b/environment.yml
index 496c985603e..9d920f6078c 100644
--- a/environment.yml
+++ b/environment.yml
@@ -15,6 +15,7 @@ dependencies:
   - cachetools
   - certifi
   - cmreshandler >1.0.0b4
+  - cwltool
   - db12
   - elasticsearch <7.14
   - elasticsearch-dsl
diff --git a/setup.cfg b/setup.cfg
index b9c686e1b26..d03d960b65a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,6 +28,7 @@ install_requires =
     botocore
     cachetools
     certifi
+    cwltool
     diraccfg
     diracx-client
     diracx-core