diff --git a/CITATION.bib b/CITATION.bib
index c5c851db99001..af8cffe7aa524 100644
--- a/CITATION.bib
+++ b/CITATION.bib
@@ -26,7 +26,7 @@ @article{Julia-2019-a
    pages = {120:1--120:23},
    articleno = {120},
    numpages = {23},
-   url = {http://doi.acm.org/10.1145/3276490},
+   url = {https://doi.acm.org/10.1145/3276490},
    doi = {10.1145/3276490},
    acmid = {3276490},
    publisher = {ACM},
@@ -47,7 +47,7 @@ @article{Julia-2019-b
    pages = {113:1--113:27},
    articleno = {113},
    numpages = {27},
-   url = {http://doi.acm.org/10.1145/3276483},
+   url = {https://doi.acm.org/10.1145/3276483},
    doi = {10.1145/3276483},
    acmid = {3276483},
    publisher = {ACM},
@@ -66,7 +66,7 @@ @inproceedings{Julia-2014
    pages = {56:56--56:61},
    articleno = {56},
    numpages = {6},
-   url = {http://doi.acm.org/10.1145/2627373.2627383},
+   url = {https://doi.acm.org/10.1145/2627373.2627383},
    doi = {10.1145/2627373.2627383},
    acmid = {2627383},
    publisher = {ACM},