diff --git a/conda_requirements.txt b/conda_requirements.txt
index 826a037..6bc3ed0 100644
--- a/conda_requirements.txt
+++ b/conda_requirements.txt
@@ -1,7 +1,7 @@
 matplotlib=3.0.1=py36h5429711_0
 numpy=1.15.3=py36h1d66e8a_0
 pandas=0.23.4=py36h04863e7_0
-pyyaml=3.13=py36h14c3975_0
+pyyaml>=4.2b1
 seaborn=0.9.0=py36_0
 scikit_learn=0.19.0
 pytorch=0.4.1=py36ha74772b_0