diff --git a/common/supplemental/supplementalData.xml b/common/supplemental/supplementalData.xml
index a09b40e85c4..cc5d5342568 100644
--- a/common/supplemental/supplementalData.xml
+++ b/common/supplemental/supplementalData.xml
@@ -958,7 +958,7 @@ The printed version of ISO-4217:2001
         </region>
         <region iso3166="SL">
             <currency iso4217="SLE" from="2022-07-01"/>
-            <currency iso4217="SLL" from="1964-08-04" to="2023-03-31"/>
+            <currency iso4217="SLL" from="1964-08-04" to="2023-12-31"/>
             <currency iso4217="GBP" from="1808-11-30" to="1966-02-04"/>
         </region>
         <region iso3166="SM">