diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 6e84849c7e..0d62e8a798 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -30,10 +30,12 @@
     *   Reset playback speed when live playback speed control becomes unused
         ([#8664](https://github.com/google/ExoPlayer/issues/8664)).
     *   Fix playback position issue when re-preparing playback after a
-        BehindLiveWindowException
+        `BehindLiveWindowException`
         ([#8675](https://github.com/google/ExoPlayer/issues/8675)).
     *   Add a `Listener` interface to receive all player events in a single
         object.
+    *   `Player.setPlaybackParameters` no longer accepts null, use
+        `PlaybackParameters.DEFAULT` instead.
 *   HLS:
     *   Fix issue that could cause playback to become stuck if corresponding
         `EXT-X-DISCONTINUITY` tags in different media playlists occur at
diff --git a/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java b/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
index 3742c9a607..4462e4cfa1 100644
--- a/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
+++ b/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
@@ -469,7 +469,7 @@ public final class CastPlayer extends BasePlayer {
   }
 
   @Override
-  public void setPlaybackParameters(@Nullable PlaybackParameters playbackParameters) {
+  public void setPlaybackParameters(PlaybackParameters playbackParameters) {
     // Unsupported by the RemoteMediaClient API. Do nothing.
   }
 
diff --git a/library/common/src/main/java/com/google/android/exoplayer2/Player.java b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
index 7f5b6e8385..f668e4df76 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/Player.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
@@ -1491,16 +1491,16 @@ public interface Player {
   void next();
 
   /**
-   * Attempts to set the playback parameters. Passing {@code null} sets the parameters to the
-   * default, {@link PlaybackParameters#DEFAULT}, which means there is no speed or pitch adjustment.
+   * Attempts to set the playback parameters. Passing {@link PlaybackParameters#DEFAULT} resets the
+   * player to the default, which means there is no speed or pitch adjustment.
    *
    * <p>Playback parameters changes may cause the player to buffer. {@link
    * EventListener#onPlaybackParametersChanged(PlaybackParameters)} will be called whenever the
    * currently active playback parameters change.
    *
-   * @param playbackParameters The playback parameters, or {@code null} to use the defaults.
+   * @param playbackParameters The playback parameters.
    */
-  void setPlaybackParameters(@Nullable PlaybackParameters playbackParameters);
+  void setPlaybackParameters(PlaybackParameters playbackParameters);
 
   /**
    * Changes the rate at which playback occurs. The pitch is not changed.
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
index f86ee73bde..c81c2c71f4 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
@@ -669,7 +669,7 @@ import java.util.concurrent.CopyOnWriteArraySet;
   }
 
   @Override
-  public void setPlaybackParameters(@Nullable PlaybackParameters playbackParameters) {
+  public void setPlaybackParameters(PlaybackParameters playbackParameters) {
     if (playbackParameters == null) {
       playbackParameters = PlaybackParameters.DEFAULT;
     }
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java b/library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java
index 8aa879ea9a..9a55918922 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java
@@ -1467,7 +1467,7 @@ public class SimpleExoPlayer extends BasePlayer
   }
 
   @Override
-  public void setPlaybackParameters(@Nullable PlaybackParameters playbackParameters) {
+  public void setPlaybackParameters(PlaybackParameters playbackParameters) {
     verifyApplicationThread();
     player.setPlaybackParameters(playbackParameters);
   }
diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java
index a51fdbbc42..722fca7895 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java
@@ -281,7 +281,7 @@ public abstract class StubExoPlayer extends BasePlayer implements ExoPlayer {
   }
 
   @Override
-  public void setPlaybackParameters(@Nullable PlaybackParameters playbackParameters) {
+  public void setPlaybackParameters(PlaybackParameters playbackParameters) {
     throw new UnsupportedOperationException();
   }