diff --git a/environment.yml b/environment.yml
index eeaec391546f8a80bd99ea7b0c3b07900ddc4579..c76cde6d71c1a7975ffe1b818db04832c12e579c 100644
--- a/environment.yml
+++ b/environment.yml
@@ -73,7 +73,7 @@ dependencies:
     - crowdai-api==0.1.21
     - cycler==0.10.0
     - filelock==3.0.12
-    - flatland-rl
+    - flatland-rl==2.1.10
     - future==0.17.1
     - gym==0.14.0
     - idna==2.8