diff --git a/package.json b/package.json
index c185924..69608a6 100644
--- a/package.json
+++ b/package.json
@@ -13,11 +13,10 @@
     "superagent": "1.4.0"
   },
   "peerDependencies": {
-    "@cycle/core": "5.x.x"
+    "@reactivex/rxjs": "5.0.0-alpha.6"
   },
   "devDependencies": {
-    "@cycle/core": "5.0.x",
-    "rx": "4.0.6",
+    "@reactivex/rxjs": "5.0.0-alpha.6",
     "babel": "5.8.23",
     "babelify": "6.3.0",
     "body-parser": "1.14.1",
diff --git a/src/http-driver.js b/src/http-driver.js
index debbfb0..75f52e1 100644
--- a/src/http-driver.js
+++ b/src/http-driver.js
@@ -1,4 +1,4 @@
-const Rx = require(`rx`)
+const Rx = require(`@reactivex/rxjs`)
 const superagent = require(`superagent`)
 
 function optionsToSuperagent({
@@ -71,9 +71,14 @@ function createResponse$(reqOptions) {
     if (typeof reqOptions === `string`) {
       request = urlToSuperagent(reqOptions)
     } else if (typeof reqOptions === `object`) {
-      request = optionsToSuperagent(reqOptions)
+      try {
+        request = optionsToSuperagent(reqOptions)
+      } catch (err) {
+        observer.error(err)
+        return () => {} // noop
+      }
     } else {
-      observer.onError(new Error(`Observable of requests given to HTTP ` +
+      observer.error(new Error(`Observable of requests given to HTTP ` +
         `Driver must emit either URL strings or objects with parameters.`))
       return () => {} // noop
     }
@@ -81,14 +86,14 @@ function createResponse$(reqOptions) {
     try {
       request.end((err, res) => {
         if (err) {
-          observer.onError(err)
+          observer.error(err)
         } else {
-          observer.onNext(res)
-          observer.onCompleted()
+          observer.next(res)
+          observer.complete()
         }
       })
     } catch (err) {
-      observer.onError(err)
+      observer.error(err)
     }
 
     return function onDispose() {
@@ -103,13 +108,13 @@ function makeHTTPDriver({eager = false} = {eager: false}) {
       .map(reqOptions => {
         let response$ = createResponse$(reqOptions)
         if (eager || reqOptions.eager) {
-          response$ = response$.replay(null, 1)
+          response$ = response$.publishReplay(1)
           response$.connect()
+          return response$
         }
         response$.request = reqOptions
         return response$
-      })
-      .replay(null, 1)
+      }).publishReplay(1)
     response$$.connect()
     return response$$
   }
diff --git a/test/common.js b/test/common.js
index 3f2d94b..52f8d70 100644
--- a/test/common.js
+++ b/test/common.js
@@ -2,8 +2,7 @@
 /* global describe, it */
 var assert = require('assert');
 var src = require('../lib/index');
-var Cycle = require('@cycle/core');
-var Rx = require('rx');
+var Rx = require('@reactivex/rxjs');
 var makeHTTPDriver = src.makeHTTPDriver;
 
 function run(uri) {
@@ -18,7 +17,7 @@ function run(uri) {
   describe('HTTP Driver', function () {
     it('should throw when request stream emits neither string nor object',
       function(done) {
-        var request$ = Rx.Observable.just(123);
+        var request$ = Rx.Observable.of(123);
         var httpDriver = makeHTTPDriver();
         var response$$ = httpDriver(request$);
         response$$.mergeAll().subscribe(
@@ -36,25 +35,26 @@ function run(uri) {
 
     it('should throw when given options object without url string',
       function(done) {
-        var request$ = Rx.Observable.just({method: 'post'});
+        var request$ = Rx.Observable.of({method: 'post'});
         var httpDriver = makeHTTPDriver();
         var response$$ = httpDriver(request$);
-        response$$.mergeAll().subscribe(
-          function onNext() { assert.fail(); },
-          function onError(err) {
-            assert.strictEqual(
-              err.message, 'Please provide a `url` property in the request ' +
-              'options.'
-            );
-            done();
-          }
-        );
+        response$$.mergeAll()
+          .subscribe(
+            function onNext() { assert.fail(); },
+            function onError(err) {
+              assert.strictEqual(
+                err.message, 'Please provide a `url` property in the request ' +
+                'options.'
+              );
+              done();
+            }
+          );
       }
     );
 
     it('should return response metastream when given a simple URL string',
       function(done) {
-        var request$ = Rx.Observable.just(uri + '/hello');
+        var request$ = Rx.Observable.of(uri + '/hello');
         var httpDriver = makeHTTPDriver();
         var response$$ = httpDriver(request$);
         response$$.subscribe(function(response$) {
@@ -70,7 +70,7 @@ function run(uri) {
 
     it('should return response metastream when given simple options obj',
       function(done) {
-        var request$ = Rx.Observable.just({
+        var request$ = Rx.Observable.of({
           url: uri + '/pet',
           method: 'POST',
           send: {name: 'Woof', species: 'Dog'}
@@ -93,7 +93,7 @@ function run(uri) {
 
     it('should return response metastream when given another options obj',
       function(done) {
-        var request$ = Rx.Observable.just({
+        var request$ = Rx.Observable.of({
           url: uri + '/querystring',
           method: 'GET',
           query: {foo: 102030, bar: 'Pub'}
@@ -117,7 +117,7 @@ function run(uri) {
 
     it('should send 500 server errors to response$ onError',
       function(done) {
-        var request$ = Rx.Observable.just(uri + '/error');
+        var request$ = Rx.Observable.of(uri + '/error');
         var httpDriver = makeHTTPDriver();
         var response$$ = httpDriver(request$);
         response$$.subscribe(function(response$) {
diff --git a/test/node.js b/test/node.js
index 943d3d3..73e6a4f 100644
--- a/test/node.js
+++ b/test/node.js
@@ -7,8 +7,7 @@ require('./common')(uri);
 
 // Node.js specific ============================================================
 var assert = require('assert');
-var Cycle = require('@cycle/core');
-var Rx = require('rx');
+var Rx = require('@reactivex/rxjs');
 var src = require('../lib/index');
 var makeHTTPDriver = src.makeHTTPDriver;
 var globalSandbox = require('./support/global');
@@ -16,7 +15,7 @@ var globalSandbox = require('./support/global');
 describe('HTTP Driver in Node.js', function () {
   it('should auto-execute HTTP request when factory gets eager = true',
     function(done) {
-      var request$ = Rx.Observable.just({
+      var request$ = Rx.Observable.of({
         url: uri + '/pet',
         method: 'POST',
         send: {name: 'Woof', species: 'Dog'}
@@ -35,7 +34,7 @@ describe('HTTP Driver in Node.js', function () {
 
   it('should not auto-execute HTTP request by default',
     function(done) {
-      var request$ = Rx.Observable.just({
+      var request$ = Rx.Observable.of({
         url: uri + '/pet',
         method: 'POST',
         send: {name: 'Woof', species: 'Dog'}
@@ -52,7 +51,7 @@ describe('HTTP Driver in Node.js', function () {
 
   it('should auto-execute HTTP request if the request has eager = true',
     function(done) {
-      var request$ = Rx.Observable.just({
+      var request$ = Rx.Observable.of({
         url: uri + '/pet',
         method: 'POST',
         send: {name: 'Woof', species: 'Dog'},
@@ -72,7 +71,7 @@ describe('HTTP Driver in Node.js', function () {
 
   it('should not auto-execute HTTP request when factory gets eager = false',
     function(done) {
-      var request$ = Rx.Observable.just({
+      var request$ = Rx.Observable.of({
         url: uri + '/pet',
         method: 'POST',
         send: {name: 'Woof', species: 'Dog'}