diff --git a/releases/kotlin.json b/releases/kotlin.json
index e82c03c7..9f411c43 100644
--- a/releases/kotlin.json
+++ b/releases/kotlin.json
@@ -63,5 +63,6 @@
   "1.7.22": "2022-11-28",
   "1.8.0": "2022-12-28",
   "1.8.10": "2023-02-02",
-  "1.8.20": "2023-03-30"
+  "1.8.20": "2023-03-30",
+  "1.8.21": "2023-04-25"
 }
\ No newline at end of file
diff --git a/releases/typo3.json b/releases/typo3.json
index b5c78ff0..d90cab61 100644
--- a/releases/typo3.json
+++ b/releases/typo3.json
@@ -402,6 +402,7 @@
   "12.1.3": "2022-12-15",
   "12.2.0": "2023-02-07",
   "12.3.0": "2023-03-28",
+  "12.4.0": "2023-04-25",
   "9.0.0": "2017-12-12",
   "9.1.0": "2018-01-30",
   "9.2.0": "2018-04-09",