diff --git a/.travis.yml b/.travis.yml
index 94d55bc3..db37918b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: php
 
 php:
+  - 5.3
   - 5.4
   - 5.5
   - 5.6
diff --git a/composer.json b/composer.json
index cfc6f04a..3d431527 100644
--- a/composer.json
+++ b/composer.json
@@ -4,11 +4,11 @@
     "keywords": ["http"],
     "license": "MIT",
     "require": {
-        "php": ">=5.4.0",
-        "guzzlehttp/psr7": "^1.0",
+        "php": ">=5.3.0",
+        "ringcentral/psr7": "^1.0",
         "react/socket": "^0.4",
         "react/stream": "^0.4",
-        "evenement/evenement": "^2.0"
+        "evenement/evenement": "^2.0 || ^1.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/RequestHeaderParser.php b/src/RequestHeaderParser.php
index af70ed1b..7c44ab02 100644
--- a/src/RequestHeaderParser.php
+++ b/src/RequestHeaderParser.php
@@ -4,7 +4,7 @@
 
 use Evenement\EventEmitter;
 use Exception;
-use GuzzleHttp\Psr7 as g7;
+use RingCentral\Psr7 as g7;
 
 /**
  * @event headers
@@ -37,7 +37,7 @@ public function feed($data)
             try {
                 $this->parseAndEmitRequest();
             } catch (Exception $exception) {
-                $this->emit('error', [$exception]);
+                $this->emit('error', array($exception));
             }
             $this->removeAllListeners();
         }
@@ -55,7 +55,7 @@ public function parseRequest($data)
 
         $psrRequest = g7\parse_request($headers);
 
-        $parsedQuery = [];
+        $parsedQuery = array();
         $queryString = $psrRequest->getUri()->getQuery();
         if ($queryString) {
             parse_str($queryString, $parsedQuery);
diff --git a/src/Response.php b/src/Response.php
index 36e375fc..bab5fc0f 100644
--- a/src/Response.php
+++ b/src/Response.php
@@ -17,18 +17,18 @@ class Response extends EventEmitter implements WritableStreamInterface
     public function __construct(ConnectionInterface $conn)
     {
         $this->conn = $conn;
-
-        $this->conn->on('end', function () {
-            $this->close();
+        $that = $this;
+        $this->conn->on('end', function () use ($that) {
+            $that->close();
         });
 
-        $this->conn->on('error', function ($error) {
-            $this->emit('error', array($error, $this));
-            $this->close();
+        $this->conn->on('error', function ($error) use ($that) {
+            $that->emit('error', array($error, $that));
+            $that->close();
         });
 
-        $this->conn->on('drain', function () {
-            $this->emit('drain');
+        $this->conn->on('drain', function () use ($that) {
+            $that->emit('drain');
         });
     }
 
diff --git a/src/Server.php b/src/Server.php
index 49535060..2f5f641a 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -14,18 +14,19 @@ class Server extends EventEmitter implements ServerInterface
     public function __construct(SocketServerInterface $io)
     {
         $this->io = $io;
+        $that = $this;
 
-        $this->io->on('connection', function (ConnectionInterface $conn) {
+        $this->io->on('connection', function (ConnectionInterface $conn) use ($that) {
             // TODO: http 1.1 keep-alive
             // TODO: chunked transfer encoding (also for outgoing data)
             // TODO: multipart parsing
 
             $parser = new RequestHeaderParser();
-            $parser->on('headers', function (Request $request, $bodyBuffer) use ($conn, $parser) {
+            $parser->on('headers', function (Request $request, $bodyBuffer) use ($conn, $parser, $that) {
                 // attach remote ip to the request as metadata
                 $request->remoteAddress = $conn->getRemoteAddress();
 
-                $this->handleRequest($conn, $request, $bodyBuffer);
+                $that->handleRequest($conn, $request, $bodyBuffer);
 
                 $conn->removeListener('data', array($parser, 'feed'));
                 $conn->on('end', function () use ($request) {
@@ -42,12 +43,12 @@ public function __construct(SocketServerInterface $io)
                 });
             });
 
-            $listener = [$parser, 'feed'];
+            $listener = array($parser, 'feed');
             $conn->on('data', $listener);
-            $parser->on('error', function() use ($conn, $listener) {
+            $parser->on('error', function() use ($conn, $listener, $that) {
                 // TODO: return 400 response
                 $conn->removeListener('data', $listener);
-                $this->emit('error', func_get_args());
+                $that->emit('error', func_get_args());
             });
         });
     }
diff --git a/tests/ServerTest.php b/tests/ServerTest.php
index 5cef7cfc..e79347e9 100644
--- a/tests/ServerTest.php
+++ b/tests/ServerTest.php
@@ -121,7 +121,7 @@ public function testParserErrorEmitted()
 
         $data = "GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\nX-DATA: ";
         $data .= str_repeat('A', 4097 - strlen($data)) . "\r\n\r\n";
-        $this->connection->emit('data', [$data]);
+        $this->connection->emit('data', array($data));
 
         $this->assertInstanceOf('OverflowException', $error);
         $this->connection->expects($this->never())->method('write');