diff --git a/androidbrowserhelper/build.gradle b/androidbrowserhelper/build.gradle
index 502e5928..7dc9df6f 100644
--- a/androidbrowserhelper/build.gradle
+++ b/androidbrowserhelper/build.gradle
@@ -73,6 +73,7 @@ dependencies {
     implementation 'androidx.annotation:annotation:1.1.0'
     implementation 'androidx.core:core:1.0.2'
     implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.guava:guava:33.4.8-android'
 
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.mockito:mockito-core:3.0.0'
diff --git a/androidbrowserhelper/src/main/java/com/google/androidbrowserhelper/trusted/LauncherActivityMetadata.java b/androidbrowserhelper/src/main/java/com/google/androidbrowserhelper/trusted/LauncherActivityMetadata.java
index 50a84d05..7388e397 100644
--- a/androidbrowserhelper/src/main/java/com/google/androidbrowserhelper/trusted/LauncherActivityMetadata.java
+++ b/androidbrowserhelper/src/main/java/com/google/androidbrowserhelper/trusted/LauncherActivityMetadata.java
@@ -32,6 +32,8 @@
 import java.util.List;
 import java.util.Map;
 
+import com.google.common.collect.ImmutableMap;
+
 import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT;
 
 /**
@@ -162,7 +164,7 @@ public class LauncherActivityMetadata {
     private static final String LAUNCH_HANDLER_CLIENT_MODE_METADATA_NAME
             = "android.support.customtabs.trusted.LAUNCH_HANDLER_CLIENT_MODE";
     private static final Map<String, Integer> LAUNCH_HANDLER_CLIENT_MODE_MAP =
-            Map.of(
+            ImmutableMap.of(
                     "navigate-existing", LaunchHandlerClientMode.NAVIGATE_EXISTING,
                     "focus-existing", LaunchHandlerClientMode.FOCUS_EXISTING,
                     "navigate-new", LaunchHandlerClientMode.NAVIGATE_NEW,