diff --git a/Vagrantfile b/Vagrantfile
index 86ff4a4..aff4e1e 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -8,17 +8,17 @@
 Vagrant.configure("2") do |config|
   # Every Vagrant development environment requires a box. You can search for
   # boxes at https://atlas.hashicorp.com/search.
-  config.vm.box = "ubuntu/trusty64"
+  config.vm.box = "ubuntu/xenial64"
 
   config.vm.provider "lxc" do |lxc, override|
-    override.vm.box = "fgrehm/trusty64-lxc"
+    override.vm.box = "zaikin/xenial64-lxc"
   end
 
 
   #
   # mass-define "generic" Ubuntu boxes
   #
-  %w{5.1 5.2 5.4 5.7 5.8 5.9 6.0}.each { |version|
+  %w{5.7 5.8 5.9 6.0}.each { |version|
     config.vm.define "v8-#{version}" do |i|
       i.vm.synced_folder ".", "/data/v8js"
 
diff --git a/config.m4 b/config.m4
index 69127ea..0e30b4c 100644
--- a/config.m4
+++ b/config.m4
@@ -188,6 +188,8 @@ int main ()
   LDFLAGS="$old_LDFLAGS"
   CPPFLAGS=$old_CPPFLAGS
 
+  AC_DEFINE([V8_DEPRECATION_WARNINGS], [1], [Enable compiler warnings when using V8_DEPRECATED apis.])
+
   PHP_ADD_INCLUDE($V8_DIR)
   PHP_NEW_EXTENSION(v8js, [	\
     v8js_array_access.cc	\
diff --git a/v8js_class.cc b/v8js_class.cc
index 43f8bfe..900b5d6 100644
--- a/v8js_class.cc
+++ b/v8js_class.cc
@@ -410,8 +410,7 @@ static PHP_METHOD(V8Js, __construct)
 	v8::HandleScope handle_scope(isolate);
 
 	/* Redirect fatal errors to PHP error handler */
-	// This needs to be done within the context isolate
-	v8::V8::SetFatalErrorHandler(v8js_fatal_error_handler);
+	isolate->SetFatalErrorHandler(v8js_fatal_error_handler);
 
 	/* Create global template for global object */
 	// Now we are using multiple isolates this needs to be created for every context
@@ -486,7 +485,7 @@ static PHP_METHOD(V8Js, __construct)
 	/* Add the PHP object into global object */
 	php_obj_t->InstanceTemplate()->SetInternalFieldCount(2);
 	v8::Local<v8::Object> php_obj = php_obj_t->InstanceTemplate()->NewInstance();
-	V8JS_GLOBAL(isolate)->ForceSet(object_name_js, php_obj, v8::ReadOnly);
+	V8JS_GLOBAL(isolate)->DefineOwnProperty(context, object_name_js, php_obj, v8::ReadOnly);
 
 	/* Export public property values */
 	HashTable *properties = zend_std_get_properties(getThis());
@@ -504,12 +503,12 @@ static PHP_METHOD(V8Js, __construct)
 				return;
 			}
 
-			v8::Local<v8::Value> key = v8::String::NewFromUtf8(isolate, ZSTR_VAL(member),
+			v8::Local<v8::Name> key = v8::String::NewFromUtf8(isolate, ZSTR_VAL(member),
 				v8::String::kInternalizedString, static_cast<int>(ZSTR_LEN(member)));
 
 			/* Write value to PHP JS object */
 			value = OBJ_PROP(Z_OBJ_P(getThis()), property_info->offset);
-			php_obj->ForceSet(key, zval_to_v8js(value, isolate), v8::ReadOnly);
+			php_obj->DefineOwnProperty(context, key, zval_to_v8js(value, isolate), v8::ReadOnly);
 		}
 	} ZEND_HASH_FOREACH_END();
 
@@ -584,7 +583,7 @@ static PHP_METHOD(V8Js, __construct)
 			persistent_ft->Reset(isolate, ft);
 		}
 
-		php_obj->ForceSet(method_name, ft->GetFunction());
+		php_obj->CreateDataProperty(context, method_name, ft->GetFunction());
 	} ZEND_HASH_FOREACH_END();
 }
 /* }}} */
@@ -616,7 +615,7 @@ static void v8js_compile_script(zval *this_ptr, const zend_string *str, const ze
 	V8JS_BEGIN_CTX(c, this_ptr)
 
 	/* Catch JS exceptions */
-	v8::TryCatch try_catch;
+	v8::TryCatch try_catch(isolate);
 
 	/* Set script identifier */
 	if (identifier && ZSTR_LEN(identifier) > std::numeric_limits<int>::max()) {
@@ -1289,8 +1288,8 @@ static void v8js_write_property(zval *object, zval *member, zval *value, void **
 		}
 
 		/* Write value to PHP JS object */
-		v8::Local<v8::Value> key = V8JS_SYML(Z_STRVAL_P(member), static_cast<int>(Z_STRLEN_P(member)));
-		jsobj->ForceSet(key, zval_to_v8js(value, isolate), v8::ReadOnly);
+		v8::Local<v8::Name> key = V8JS_SYML(Z_STRVAL_P(member), static_cast<int>(Z_STRLEN_P(member)));
+		jsobj->DefineOwnProperty(v8_context, key, zval_to_v8js(value, isolate), v8::ReadOnly);
 	}
 
 	/* Write value to PHP object */
diff --git a/v8js_exceptions.cc b/v8js_exceptions.cc
index 1e77dcd..42fe7b1 100644
--- a/v8js_exceptions.cc
+++ b/v8js_exceptions.cc
@@ -44,7 +44,7 @@ void v8js_create_script_exception(zval *return_value, v8::Isolate *isolate, v8::
 	v8::Local<v8::Message> tc_message = try_catch->Message();
 	const char *filename_string, *sourceline_string;
 	char *message_string;
-	int linenum, start_col, end_col;
+	int linenum, start_col;
 
 	object_init_ex(return_value, php_ce_v8js_script_exception);
 
@@ -70,8 +70,10 @@ void v8js_create_script_exception(zval *return_value, v8::Isolate *isolate, v8::
 		start_col = tc_message->GetStartColumn();
 		PHPV8_EXPROP(_long, JsStartColumn, start_col);
 
-		end_col = tc_message->GetEndColumn();
-		PHPV8_EXPROP(_long, JsEndColumn, end_col);
+		v8::Maybe<int> end_col = tc_message->GetEndColumn(isolate->GetEnteredContext());
+		if (end_col.IsJust()) {
+			PHPV8_EXPROP(_long, JsEndColumn, end_col.FromJust());
+		}
 
 		spprintf(&message_string, 0, "%s:%d: %s", filename_string, linenum, exception_string);
 
diff --git a/v8js_generator_export.cc b/v8js_generator_export.cc
index 4aea008..a27fa93 100644
--- a/v8js_generator_export.cc
+++ b/v8js_generator_export.cc
@@ -24,7 +24,7 @@ v8::Local<v8::Value> v8js_wrap_generator(v8::Isolate *isolate, v8::Local<v8::Val
 	assert(!wrapped_object.IsEmpty());
 	assert(wrapped_object->IsObject());
 
-	v8::TryCatch try_catch;
+	v8::TryCatch try_catch(isolate);
 	v8::Local<v8::String> source = v8::String::NewFromUtf8(isolate, "(\
 function(wrapped_object) {					\
 	return (function*() {					\
diff --git a/v8js_methods.cc b/v8js_methods.cc
index f22aa18..21fef8b 100644
--- a/v8js_methods.cc
+++ b/v8js_methods.cc
@@ -92,7 +92,7 @@ static void v8js_dumper(v8::Isolate *isolate, v8::Local<v8::Value> var, int leve
 		return;
 	}
 
-	v8::TryCatch try_catch; /* object.toString() can throw an exception */
+	v8::TryCatch try_catch(isolate); /* object.toString() can throw an exception */
 	v8::Local<v8::String> details;
 
 	if(var->IsRegExp()) {
@@ -100,7 +100,7 @@ static void v8js_dumper(v8::Isolate *isolate, v8::Local<v8::Value> var, int leve
 		details = re->GetSource();
 	}
 	else {
-		details = var->ToDetailString();
+		details = var->ToDetailString(isolate->GetEnteredContext()).FromMaybe(v8::Local<v8::String>());
 
 		if (try_catch.HasCaught()) {
 			details = V8JS_SYM("<toString threw exception>");
@@ -401,18 +401,18 @@ V8JS_METHOD(require)
 	}
 
 	// Create a template for the global object and set the built-in global functions
-	v8::Local<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
+	v8::Local<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New(isolate);
 	global_template->Set(V8JS_SYM("print"), v8::FunctionTemplate::New(isolate, V8JS_MN(print)), v8::ReadOnly);
 	global_template->Set(V8JS_SYM("var_dump"), v8::FunctionTemplate::New(isolate, V8JS_MN(var_dump)), v8::ReadOnly);
 	global_template->Set(V8JS_SYM("sleep"), v8::FunctionTemplate::New(isolate, V8JS_MN(sleep)), v8::ReadOnly);
 	global_template->Set(V8JS_SYM("require"), v8::FunctionTemplate::New(isolate, V8JS_MN(require), v8::External::New(isolate, c)), v8::ReadOnly);
 
 	// Add the exports object in which the module can return its API
-	v8::Local<v8::ObjectTemplate> exports_template = v8::ObjectTemplate::New();
+	v8::Local<v8::ObjectTemplate> exports_template = v8::ObjectTemplate::New(isolate);
 	global_template->Set(V8JS_SYM("exports"), exports_template);
 
 	// Add the module object in which the module can have more fine-grained control over what it can return
-	v8::Local<v8::ObjectTemplate> module_template = v8::ObjectTemplate::New();
+	v8::Local<v8::ObjectTemplate> module_template = v8::ObjectTemplate::New(isolate);
 	module_template->Set(V8JS_SYM("id"), V8JS_STR(normalised_module_id));
 	global_template->Set(V8JS_SYM("module"), module_template);
 
@@ -420,7 +420,7 @@ V8JS_METHOD(require)
 	v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolate, v8::Context::New(isolate, NULL, global_template));
 
 	// Catch JS exceptions
-	v8::TryCatch try_catch;
+	v8::TryCatch try_catch(isolate);
 
 	v8::Locker locker(isolate);
 	v8::Isolate::Scope isolate_scope(isolate);
diff --git a/v8js_object_export.cc b/v8js_object_export.cc
index 5bf36ad..254e0ed 100644
--- a/v8js_object_export.cc
+++ b/v8js_object_export.cc
@@ -438,10 +438,17 @@ static void v8js_invoke_callback(const v8::FunctionCallbackInfo<v8::Value>& info
 		new_tpl = v8::Local<v8::FunctionTemplate>::New
 			(isolate, ctx->template_cache.at(ce->name));
 
-		result = new_tpl->GetFunction()->NewInstance(argc, argv);
+		v8::MaybeLocal<v8::Object> maybeResult = new_tpl->GetFunction()->NewInstance(isolate->GetEnteredContext(), argc, argv);
+
+		if (!maybeResult.IsEmpty()) {
+			result = maybeResult.ToLocalChecked();
+		} else {
+			result = V8JS_UNDEFINED;
+		}
 	} else {
 		result = cb->Call(self, argc, argv);
 	}
+
 	info.GetReturnValue().Set(result);
 }
 /* }}} */
@@ -804,7 +811,7 @@ static void v8js_named_property_deleter(v8::Local<v8::String> property, const v8
 
 
 
-static v8::Local<v8::Object> v8js_wrap_object(v8::Isolate *isolate, zend_class_entry *ce, zval *value) /* {{{ */
+static v8::MaybeLocal<v8::Object> v8js_wrap_object(v8::Isolate *isolate, zend_class_entry *ce, zval *value) /* {{{ */
 {
 	v8js_ctx *ctx = (v8js_ctx *) isolate->GetData(0);
 	v8::Local<v8::FunctionTemplate> new_tpl;
@@ -903,11 +910,11 @@ static v8::Local<v8::Object> v8js_wrap_object(v8::Isolate *isolate, zend_class_e
 
 	// Create v8 wrapper object
 	v8::Local<v8::Value> external = v8::External::New(isolate, Z_OBJ_P(value));
-	v8::Local<v8::Object> newobj = new_tpl->GetFunction()->NewInstance(1, &external);
+	v8::MaybeLocal<v8::Object> newobj = new_tpl->GetFunction()->NewInstance(isolate->GetEnteredContext(), 1, &external);
 
-	if (ce == zend_ce_closure) {
+	if (ce == zend_ce_closure && !newobj.IsEmpty()) {
 		// free uncached function template when object is freed
-		ctx->weak_closures[persist_tpl_].Reset(isolate, newobj);
+		ctx->weak_closures[persist_tpl_].Reset(isolate, newobj.ToLocalChecked());
 		ctx->weak_closures[persist_tpl_].SetWeak(persist_tpl_, v8js_weak_closure_callback, v8::WeakCallbackType::kParameter);
 	}
 
@@ -1025,15 +1032,19 @@ v8::Local<v8::Value> v8js_hash_to_jsobj(zval *value, v8::Isolate *isolate) /* {{
 
 	/* If it's a PHP object, wrap it */
 	if (ce) {
-		v8::Local<v8::Value> wrapped_object = v8js_wrap_object(isolate, ce, value);
+		v8::MaybeLocal<v8::Object> wrapped_object = v8js_wrap_object(isolate, ce, value);
+
+		if (wrapped_object.IsEmpty()) {
+			return V8JS_UNDEFINED;
+		}
 
 		if (ce == zend_ce_generator) {
 			/* Wrap PHP Generator object in a wrapper function that provides
 			 * ES6 style behaviour. */
-			wrapped_object = v8js_wrap_generator(isolate, wrapped_object);
+			return v8js_wrap_generator(isolate, wrapped_object.ToLocalChecked());
 		}
 
-		return wrapped_object;
+		return wrapped_object.ToLocalChecked();
 	}
 
 	/* Associative PHP arrays cannot be wrapped to JS arrays, convert them to
diff --git a/v8js_timer.cc b/v8js_timer.cc
index 965d865..185907f 100644
--- a/v8js_timer.cc
+++ b/v8js_timer.cc
@@ -67,7 +67,7 @@ static void v8js_timer_interrupt_handler(v8::Isolate *isolate, void *data) { /*
 			if (timer_ctx->memory_limit > 0 && hs.used_heap_size() > timer_ctx->memory_limit) {
 				if (has_sent_notification) {
 					timer_ctx->killed = true;
-					v8::V8::TerminateExecution(c->isolate);
+					c->isolate->TerminateExecution();
 					c->memory_limit_hit = true;
 				} else {
 					// force garbage collection, then check again
@@ -98,7 +98,7 @@ void v8js_timer_thread(zend_v8js_globals *globals) /* {{{ */
 			}
 			else if(timer_ctx->time_limit > 0 && now > timer_ctx->time_point) {
 				timer_ctx->killed = true;
-				v8::V8::TerminateExecution(c->isolate);
+				c->isolate->TerminateExecution();
 				c->time_limit_hit = true;
 			}
 			else if (timer_ctx->memory_limit > 0) {
diff --git a/v8js_v8.cc b/v8js_v8.cc
index f886f0c..607fb42 100644
--- a/v8js_v8.cc
+++ b/v8js_v8.cc
@@ -120,7 +120,7 @@ void v8js_v8_call(v8js_ctx *c, zval **return_value,
 	V8JSG(timer_mutex).unlock();
 
 	/* Catch JS exceptions */
-	v8::TryCatch try_catch;
+	v8::TryCatch try_catch(isolate);
 
 	/* Set flags for runtime use */
 	c->flags = flags;
@@ -246,7 +246,7 @@ void v8js_v8_call(v8js_ctx *c, zval **return_value,
 
 void v8js_terminate_execution(v8::Isolate *isolate) /* {{{ */
 {
-	if(v8::V8::IsExecutionTerminating(isolate)) {
+	if(isolate->IsExecutionTerminating()) {
 		/* Execution already terminating, needn't trigger it again and
 		 * especially must not execute the spinning loop (which would cause
 		 * crashes in V8 itself, at least with 4.2 and 4.3 version lines). */
@@ -264,7 +264,7 @@ void v8js_terminate_execution(v8::Isolate *isolate) /* {{{ */
 
 	v8::Local<v8::String> source = V8JS_STR("for(;;);");
 	v8::Local<v8::Script> script = v8::Script::Compile(source);
-	v8::V8::TerminateExecution(isolate);
+	isolate->TerminateExecution();
 	script->Run();
 }
 /* }}} */
@@ -282,7 +282,9 @@ int v8js_get_properties_hash(v8::Local<v8::Value> jsValue, HashTable *retval, in
 			v8::Local<v8::String> jsKey = jsKeys->Get(i)->ToString();
 
 			/* Skip any prototype properties */
-			if (!jsObj->HasOwnProperty(jsKey) && !jsObj->HasRealNamedProperty(jsKey) && !jsObj->HasRealNamedCallbackProperty(jsKey)) {
+			if (!jsObj->HasOwnProperty(isolate->GetEnteredContext(), jsKey).FromMaybe(false)
+				&& !jsObj->HasRealNamedProperty(jsKey)
+				&& !jsObj->HasRealNamedCallbackProperty(jsKey)) {
 				continue;
 			}
 
diff --git a/v8js_v8object_class.cc b/v8js_v8object_class.cc
index 8814bc8..dcfc384 100644
--- a/v8js_v8object_class.cc
+++ b/v8js_v8object_class.cc
@@ -175,7 +175,7 @@ static void v8js_v8object_write_property(zval *object, zval *member, zval *value
 	}
 
 	if (v8obj->IsObject()) {
-		v8obj->ToObject()->ForceSet(V8JS_SYML(Z_STRVAL_P(member), static_cast<int>(Z_STRLEN_P(member))), zval_to_v8js(value, isolate));
+		v8obj->ToObject()->CreateDataProperty(v8_context, V8JS_SYML(Z_STRVAL_P(member), static_cast<int>(Z_STRLEN_P(member))), zval_to_v8js(value, isolate));
 	}
 }
 /* }}} */