diff --git a/2020/PWL/nnenum/nnenum/requirements.txt b/2020/PWL/nnenum/nnenum/requirements.txt
index 3cfff89..496c294 100644
--- a/2020/PWL/nnenum/nnenum/requirements.txt
+++ b/2020/PWL/nnenum/nnenum/requirements.txt
@@ -3,7 +3,7 @@ numpy==1.17.4
 scipy==1.4.1
 foolbox==2.4.0
 threadpoolctl==2.1.0
-onnx==1.7.0
+onnx==1.13.0
 onnxruntime==1.3.0
 skl2onnx==1.7.0
 swiglpk