diff --git a/appveyor.yml b/appveyor.yml
index 0bd9f65f..4cebb43d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,21 +1,22 @@
 environment:
   matrix:
-  - BUILD_PLATFORM: x86
-    ARTIFACT_NAME: v8js_vc14_php7_ts.zip
+  - ARTIFACT_NAME: v8js_vc14_php7_%Platform%_ts.zip
     OUTDIR: Release_TS
-  - BUILD_PLATFORM: x86
-    ARTIFACT_NAME: v8js_vc14_php7_nts.zip
+    V8_ASSETS: V8-5.8.301.0-%Platform%.zip
+  - ARTIFACT_NAME: v8js_vc14_php7_%Platform%_nts.zip
     OUTDIR: Release
     CONFIGURE_EXTRA: --disable-zts
+    V8_ASSETS: V8-5.8.301.0-%Platform%.zip
 
-  PHP_VERSION: 7.0.7
+  PHP_VERSION: 7.0.16
   PHP_SDK: c:\projects\php-sdk
 
 os: Windows Server 2012
-clone_folder: c:\projects\php-sdk\v8js-ci\vc14\x86\php\ext\v8js
+clone_folder: c:\projects\php-sdk\v8js-ci\vc14\%Platform%\php\ext\v8js
 
-matrix:
-  fast_finish: true
+platform:
+  - x64
+  - x86
 
 install:
   - cd %PHP_SDK%
@@ -23,21 +24,31 @@ install:
   - 7z.exe x php-sdk-binary-tools-20110915.zip
   - call bin\phpsdk_setvars.bat
   - call bin\phpsdk_buildtree.bat v8js-ci
-  - cd v8js-ci\vc14\x86
+  - cd v8js-ci\vc14\%Platform%
   - md deps
-  - curl -fSL -o v8-4.9.385.29-x86-deps.zip 'https://s3.amazonaws.com/win-phpv8/v8-4.9.385.29-x86-deps.zip'
-  - 7z.exe x v8-4.9.385.29-x86-deps.zip
+  - cd deps
+  - curl -fSL -o %V8_ASSETS% 'https://s3.amazonaws.com/win-phpv8/%V8_ASSETS%'
+  - 7z.exe x %V8_ASSETS%
+  - cd ..
   - curl -fSL -o 'php-%PHP_VERSION%.tar.gz' 'http://us1.php.net/distributions/php-%PHP_VERSION%.tar.gz'
   - ren php php-%PHP_VERSION%
   - 7z.exe x php-%PHP_VERSION%.tar.gz -y
   - 7z.exe x php-%PHP_VERSION%.tar -y | find /v "Extracting"
   - cd php-%PHP_VERSION%
+  - IF "%Platform%" == "x64" SET OUTDIR=x64\%OUTDIR%
   - mkdir %OUTDIR%
-  - move ..\deps\lib\*.dll %OUTDIR%\
+  - move ..\deps\bin\*.dll %OUTDIR%\
 
 build_script:
-  - '"%VS140COMNTOOLS%\VsDevCmd" %BUILD_PLATFORM%'
-  - set
+  - ps: >-
+      If ($env:Platform -Match "x86") {
+        $env:VCVARS_PLATFORM="x86"
+        $env:ENV_PLATFORM="x86"
+      } Else {
+        $env:VCVARS_PLATFORM="amd64"
+        $env:ENV_PLATFORM="x64"
+      }
+  - call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" %VCVARS_PLATFORM%
   - echo Building PHP [%PHP_VERSION%]
   - '%PHP_SDK%\bin\phpsdk_setvars'
   - buildconf
@@ -50,14 +61,14 @@ after_build:
   - ps: Push-AppveyorArtifact $env:ARTIFACT_NAME
 
 test_script:
-  - cd c:\projects\php-sdk\v8js-ci\vc14\x86\php-%PHP_VERSION%
+  - cd c:\projects\php-sdk\v8js-ci\vc14\%Platform%\php-%PHP_VERSION%
   - set NO_INTERACTION=1
   - set TEST_PHP_JUNIT=junit.xml
   - set REPORT_EXIT_STATUS=1
   - "%OUTDIR%\\php.exe run-tests.php -p %OUTDIR%\\php.exe ext/v8js/tests/ -d extension=php_v8js.dll -d extension_dir=%OUTDIR%\\"
 
 on_finish:
-  - cd c:\projects\php-sdk\v8js-ci\vc14\x86\php-%PHP_VERSION%
+  - cd c:\projects\php-sdk\v8js-ci\vc14\%Platform%\php-%PHP_VERSION%
   - ps: |
       # upload results to AppVeyor
       $wc = New-Object 'System.Net.WebClient'
diff --git a/config.w32 b/config.w32
index ffa90658..04ab65f9 100644
--- a/config.w32
+++ b/config.w32
@@ -16,9 +16,9 @@ if (PHP_V8JS != "no") {
 		ADD_FLAG("CFLAGS_V8JS", "/D __STDC_LIMIT_MACROS");
 
 		// defaults
-		var v8major = 4;
-		var v8minor = 7;
-		var v8build = 75;
+		var v8major = 5;
+		var v8minor = 8;
+		var v8build = 301;
 		var v8patch = 0;
 		var v8pinc = search_paths("v8-version.h", php_usual_include_suspects, null);
 		if (typeof(v8pinc) == "string") {
diff --git a/tests/long_int64.phpt b/tests/long_int64.phpt
new file mode 100644
index 00000000..78bfb542
--- /dev/null
+++ b/tests/long_int64.phpt
@@ -0,0 +1,36 @@
+--TEST--
+Test V8::executeString() : Check long 64-bit export from PHP to JS
+--SKIPIF--
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+if (4 == PHP_INT_SIZE)
+	die("SKIP test not supported on 32bit PHP");
+?>
+--FILE--
+<?php
+
+$addInt = function ($a, $b) {
+    return $a + $b;
+};
+
+$v8 = new V8Js('PHP');
+$v8->add = $addInt;
+$v8->p1 = 10;
+$v8->p2 = pow(2,45);
+
+var_dump($v8->p2);
+
+var_dump($v8->executeString('
+	var res = PHP.p1 + PHP.p2;
+	"p1:" + PHP.p1 +
+	", p2:" + PHP.p2 +
+	", PHP.add(p1,p2)=" + PHP.add(PHP.p1, PHP.p2) +
+	", p1+p2=" + res +
+	" -> " + (new Date(res)).toISOString();
+	'));
+?>
+===EOF===
+--EXPECT--
+int(35184372088832)
+string(105) "p1:10, p2:35184372088832, PHP.add(p1,p2)=35184372088842, p1+p2=35184372088842 -> 3084-12-12T12:41:28.842Z"
+===EOF===
diff --git a/v8js_convert.cc b/v8js_convert.cc
index ed29b0e1..5f6aebd7 100644
--- a/v8js_convert.cc
+++ b/v8js_convert.cc
@@ -101,7 +101,7 @@ static v8::Handle<v8::Value> v8js_hash_to_jsarr(zval *value, v8::Isolate *isolat
 v8::Handle<v8::Value> zval_to_v8js(zval *value, v8::Isolate *isolate TSRMLS_DC) /* {{{ */
 {
 	v8::Handle<v8::Value> jsValue;
-	long v;
+	zend_long v;
 	zend_class_entry *ce;
 
 	switch (Z_TYPE_P(value))
@@ -143,9 +143,9 @@ v8::Handle<v8::Value> zval_to_v8js(zval *value, v8::Isolate *isolate TSRMLS_DC)
 #undef max
 #undef min
 			if (v < - std::numeric_limits<int32_t>::min() || v > std::numeric_limits<int32_t>::max()) {
-				jsValue = V8JS_FLOAT((double)v);
+				jsValue = V8JS_FLOAT(static_cast<double>(v));
 			} else {
-				jsValue = V8JS_INT(v);
+				jsValue = V8JS_INT(static_cast<int32_t>(v));
 			}
 			break;