diff --git a/python-histograms/requirements.txt b/python-histograms/requirements.txt
index 920b2cde..cd9fdd2d 100644
--- a/python-histograms/requirements.txt
+++ b/python-histograms/requirements.txt
@@ -1,3 +1,4 @@
 mip_helper==0.7.8
 numpy==1.14.2
 pandas==0.22.0
+sqlalchemy>=1.2.18 # not directly required, pinned by Snyk to avoid a vulnerability