diff --git a/data/countries/SG.yaml b/data/countries/SG.yaml
index 8a48ec34..9b626728 100644
--- a/data/countries/SG.yaml
+++ b/data/countries/SG.yaml
@@ -147,6 +147,11 @@ holidays:
       # https://www.mom.gov.sg/employment-practices/public-holidays#Year-2025
       "2025-05-12":
         _name: Vesak
+      "2026-05-31":
+        _name: Vesak
+      "2026-06-01":
+        substitute: true
+        _name: Vesak
       # Deepavali
       # date if sunday then next monday
       "2000-10-26":
diff --git a/test/fixtures/SG-2026.json b/test/fixtures/SG-2026.json
index a9b3473f..a4a102b7 100644
--- a/test/fixtures/SG-2026.json
+++ b/test/fixtures/SG-2026.json
@@ -62,6 +62,24 @@
     "rule": "10 Dhu al-Hijjah",
     "_weekday": "Wed"
   },
+  {
+    "date": "2026-05-31 00:00:00",
+    "start": "2026-05-30T16:00:00.000Z",
+    "end": "2026-05-31T16:00:00.000Z",
+    "name": "Vesak Day",
+    "type": "public",
+    "rule": "2026-05-31",
+    "_weekday": "Sun"
+  },
+  {
+    "date": "2026-06-01 00:00:00",
+    "start": "2026-05-31T16:00:00.000Z",
+    "end": "2026-06-01T16:00:00.000Z",
+    "name": "Vesak Day",
+    "type": "public",
+    "rule": "2026-06-01",
+    "_weekday": "Mon"
+  },
   {
     "date": "2026-08-09 00:00:00",
     "start": "2026-08-08T16:00:00.000Z",