diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 7b3ec23040..e3a7bb9f13 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -11,6 +11,10 @@
         lower-case.
     *   Define ads with a full `MediaItem` instead of a single `Uri` in
         `AdPlaybackState`.
+    *   Increase `minSdk` to 19 (Android KitKat). This is
+        [aligned with all other AndroidX libraries](https://android-developers.googleblog.com/2023/10/androidx-minsdkversion-19.html),
+        and is required for us to upgrade to the latest versions of our AndroidX
+        dependencies.
 *   ExoPlayer:
     *   Add `PreloadMediaSource` and `PreloadMediaPeriod` that allows apps to
         preload the media source at a specific start position before playback,
diff --git a/constants.gradle b/constants.gradle
index aeb8bbd3a5..231938bcc8 100644
--- a/constants.gradle
+++ b/constants.gradle
@@ -14,7 +14,7 @@
 project.ext {
     releaseVersion = '1.2.1'
     releaseVersionCode = 1_002_001_3_00
-    minSdkVersion = 16
+    minSdkVersion = 19
     // See https://developer.android.com/training/cars/media/automotive-os#automotive-module
     automotiveMinSdkVersion = 28
     appTargetSdkVersion = 34