diff --git a/CITATION b/CITATION
index 8feb37d..40cb936 100644
--- a/CITATION
+++ b/CITATION
@@ -3,4 +3,4 @@ Please cite as:
 Abigail Cabunoc and Sheldon McKay (eds): "Software Carpentry: Using
 Databases and SQL."  Version 2017.08, August 2017,
 https://github.com/swcarpentry/sql-novice-survey,
-http://doi.org/10.5281/zenodo.838776
+https://doi.org/10.5281/zenodo.838776