diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 6089d9a36..9816315e3 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -144,7 +144,7 @@ dependencies {
     // UI library
     implementation("com.google.android.material:material:1.3.0-rc01")
 
-    "standardImplementation"("com.google.firebase:firebase-core:18.0.0")
+    "standardImplementation"("com.google.firebase:firebase-core:18.0.1")
 
     // ReactiveX
     implementation("io.reactivex:rxandroid:1.2.1")
@@ -248,7 +248,7 @@ dependencies {
     implementation("com.mikepenz:aboutlibraries:${BuildPluginsVersion.ABOUTLIB_PLUGIN}")
 
     // Tests
-    testImplementation("junit:junit:4.13")
+    testImplementation("junit:junit:4.13.1")
     testImplementation("org.assertj:assertj-core:3.16.1")
     testImplementation("org.mockito:mockito-core:1.10.19")
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/util/lang/RxExtensions.kt b/app/src/main/java/eu/kanade/tachiyomi/util/lang/RxExtensions.kt
index b9fb8e7eb..040265d5f 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/util/lang/RxExtensions.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/util/lang/RxExtensions.kt
@@ -11,7 +11,3 @@ operator fun CompositeSubscription.plusAssign(subscription: Subscription) = add(
 fun <T, U, R> Observable<T>.combineLatest(o2: Observable<U>, combineFn: (T, U) -> R): Observable<R> {
     return Observable.combineLatest(this, o2, combineFn)
 }
-
-fun Subscription.addTo(subscriptions: CompositeSubscription) {
-    subscriptions.add(this)
-}