diff --git a/environment.yml b/environment.yml
index 98e72d50b..57b63a1e7 100644
--- a/environment.yml
+++ b/environment.yml
@@ -39,6 +39,7 @@ dependencies:
   - types-psycopg2
   - types-PyYAML
   - transformers
+  - nltk
   - pytorch::pytorch=2.2.1
   - pytorch::torchvision
   - pytorch::cpuonly # comment out if commenting in lines below for CUDA