diff --git a/environment.yml b/environment.yml
index 885e2e62..417a30d8 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,6 +7,6 @@ dependencies:
   - compas=1.0.0
   - networkx
   - numpy
-  - progressbar2=3.50
+  - progressbar2=3.37.0
   - pyclipper=1.2.0
   - rdp=0.8