diff --git a/environment.yml b/environment.yml
index 5b548fcdf19da29f95c8ad39eb7dbac29214fcca..b5cee2f9016661f493d9e1fc04f9a62d3ee31516 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ channels:
 dependencies:
   - python=2.7.11
   - conda-forge::scipy=1.0.1
-  - conda-forge::numpy=1.16.2
+  - conda-forge::numpy=1.9.3
   - bcbio::bx-python=0.7.3
   - bioconda::pysam=0.14.1
   - cooler=0.8.3