diff --git a/src/test/java/com/oreilly/rxjava/ch1/Chapter1.java b/src/test/java/com/oreilly/rxjava/ch1/Chapter1.java
index ff7c09d..f8a109a 100644
--- a/src/test/java/com/oreilly/rxjava/ch1/Chapter1.java
+++ b/src/test/java/com/oreilly/rxjava/ch1/Chapter1.java
@@ -1,12 +1,13 @@
 package com.oreilly.rxjava.ch1;
 
 import com.oreilly.rxjava.util.Sleeper;
+import io.reactivex.Completable;
+import io.reactivex.Observable;
+import io.reactivex.Single;
+import io.reactivex.schedulers.Schedulers;
 import org.junit.Ignore;
 import org.junit.Test;
-import rx.Completable;
-import rx.Observable;
-import rx.Single;
-import rx.schedulers.Schedulers;
+
 
 import java.time.Duration;
 import java.util.Map;
@@ -25,7 +26,7 @@ public class Chapter1 {
 	public void sample_6() throws Exception {
 		Observable.create(s -> {
 			s.onNext("Hello World!");
-			s.onCompleted();
+			s.onComplete();
 		}).subscribe(hello -> System.out.println(hello));
 	}
 
@@ -36,7 +37,7 @@ public void sample_17() throws Exception {
 
 		Observable.create(s -> {
 			s.onNext(cache.get(SOME_KEY));
-			s.onCompleted();
+			s.onComplete();
 		}).subscribe(value -> System.out.println(value));
 	}
 
@@ -48,14 +49,14 @@ public void sample_35() throws Exception {
 			if (fromCache != null) {
 				// emit synchronously
 				s.onNext(fromCache);
-				s.onCompleted();
+				s.onComplete();
 			} else {
 				// fetch asynchronously
 				getDataAsynchronously(SOME_KEY)
 						.onResponse(v -> {
 							putInCache(SOME_KEY, v);
 							s.onNext(v);
-							s.onCompleted();
+							s.onComplete();
 						})
 						.onFailure(exception -> {
 							s.onError(exception);
@@ -90,7 +91,7 @@ public void sample_81() throws Exception {
 			s.onNext(1);
 			s.onNext(2);
 			s.onNext(3);
-			s.onCompleted();
+			s.onComplete();
 		});
 
 		o.map(i -> "Number " + i)
@@ -119,7 +120,7 @@ public void sample_108() throws Exception {
 				s.onNext("two");
 				s.onNext("three");
 				s.onNext("four");
-				s.onCompleted();
+				s.onComplete();
 			}).start();
 		});
 	}
@@ -151,7 +152,7 @@ public void sample_142() throws Exception {
 			new Thread(() -> {
 				s.onNext("one");
 				s.onNext("two");
-				s.onCompleted();
+				s.onComplete();
 			}).start();
 		});
 
@@ -159,7 +160,7 @@ public void sample_142() throws Exception {
 			new Thread(() -> {
 				s.onNext("three");
 				s.onNext("four");
-				s.onCompleted();
+				s.onComplete();
 			}).start();
 		});
 
@@ -173,7 +174,7 @@ public void sample_164() throws Exception {
 		Observable<String> someData = Observable.create(s -> {
 			getDataFromServerWithCallback(args, data -> {
 				s.onNext(data);
-				s.onCompleted();
+				s.onComplete();
 			});
 		});
 
@@ -265,7 +266,8 @@ public void sample_254() throws Exception {
 	@Test
 	public void sample_265() throws Exception {
 		// merge a & b into an Observable stream of 2 values
-		Observable<String> a_merge_b = getDataA().mergeWith(getDataB());
+		Observable<String> a_merge_b = getDataA().mergeWith(getDataB())
+            .toObservable();
 	}
 
 	public static Single<String> getDataA() {
@@ -283,7 +285,7 @@ public void sample_277() throws Exception {
 		Single<String> s2 = getDataAsSingle(2);
 
 		// o3 is now a stream of s1 and s2 that emits each item without waiting
-		Observable<String> o3 = Single.merge(s1, s2);
+		Observable<String> o3 = Single.merge(s1, s2).toObservable();
 	}
 
 	private Single<String> getDataAsSingle(int i) {
@@ -299,7 +301,7 @@ static Completable writeToDatabase(Object data) {
 		return Completable.create(s -> {
 			doAsyncWrite(data,
 					// callback for successful completion
-					() -> s.onCompleted(),
+					() -> s.onComplete(),
 					// callback for failure with Throwable
 					error -> s.onError(error));
 		});