diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d0f5829dc5..7118e088428 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+# 1.4.21 (2023-09-29)
+
+The following Docker images were updated because their base images changed:
+* azureiotedge-agent
+* azureiotedge-hub
+* azureiotedge-simulated-temperature-sensor
+* azureiotedge-diagnostics (remains at version 1.4.20 to match the daemon)
+
 # 1.4.20 (2023-09-18)
 
 ## Edge Agent
diff --git a/versionInfo.json b/versionInfo.json
index b482e4b4c71..a213cc716c5 100644
--- a/versionInfo.json
+++ b/versionInfo.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.4.20",
+  "version": "1.4.21",
   "build": "BUILDNUMBER",
   "commit": "COMMITID"
 }