diff --git a/requirements.txt b/requirements.txt
index 0c820e0..7282e2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ cycler==0.10.0
 future==0.18.2
 kiwisolver==1.3.2
 matplotlib==3.3.4
-numpy==1.19.3
+# numpy==1.19.3  ## do not include versioning to avoid versioning conflict
 pandas==1.1.5
 Pillow==8.4.0
 pyparsing==2.4.7