diff --git a/auth/app/build.gradle b/auth/app/build.gradle
index 9e7cc93c6..06a969c5f 100644
--- a/auth/app/build.gradle
+++ b/auth/app/build.gradle
@@ -52,7 +52,7 @@ dependencies {
 
     // Firebase UI
     // Used in FirebaseUIActivity.
-    implementation 'com.firebaseui:firebase-ui-auth:3.3.1'
+    implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
 
     // Facebook Android SDK (only required for Facebook Login)
     // Used in FacebookLoginActivity.
diff --git a/database/app/build.gradle b/database/app/build.gradle
index a84130d84..09d148c19 100644
--- a/database/app/build.gradle
+++ b/database/app/build.gradle
@@ -32,7 +32,7 @@ dependencies {
     implementation 'com.android.support:cardview-v7:27.1.1'
     implementation 'com.android.support:design:27.1.1'
 
-    implementation 'com.firebaseui:firebase-ui-database:3.3.1'
+    implementation 'com.firebaseui:firebase-ui-database:4.0.0'
 
     implementation 'com.google.firebase:firebase-core:16.0.0'
     implementation 'com.google.firebase:firebase-auth:16.0.1'
diff --git a/firestore/app/build.gradle b/firestore/app/build.gradle
index 48643edf3..282b9f382 100644
--- a/firestore/app/build.gradle
+++ b/firestore/app/build.gradle
@@ -40,7 +40,7 @@ dependencies {
     implementation 'com.google.android.gms:play-services-auth:15.0.1'
 
     // FirebaseUI (for authentication)
-    implementation 'com.firebaseui:firebase-ui-auth:3.3.1'
+    implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
 
     // ButterKnife (for sample code brevity)
     implementation 'com.jakewharton:butterknife:8.8.1'
diff --git a/functions/app/build.gradle b/functions/app/build.gradle
index 33f40ea3a..21a4d694c 100644
--- a/functions/app/build.gradle
+++ b/functions/app/build.gradle
@@ -38,7 +38,7 @@ dependencies {
     implementation 'com.google.firebase:firebase-core:16.0.0'
     implementation 'com.google.firebase:firebase-functions:16.0.1'
 
-    implementation 'com.firebaseui:firebase-ui-auth:3.3.1'
+    implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
     implementation 'com.google.firebase:firebase-auth:16.0.1'
     implementation 'com.google.android.gms:play-services-auth:15.0.1'