diff --git a/environment.yml b/environment.yml
index df761af1321b2b721f2b68c69326ec882e989038..34958b7d3505d0ad73b33fb325ab1f87a0d6f8a3 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ channels:
   - bioconda
   - defaults
 dependencies:
-  - python=2.7.16
+  - python=2.7.15
   - pip=19.1
   - scipy=1.2.1
   - numpy=1.16.3