diff --git a/deps/jerryscript b/deps/jerryscript
index c429530d0..145ab1ed7 160000
--- a/deps/jerryscript
+++ b/deps/jerryscript
@@ -1 +1 @@
-Subproject commit c429530d02347431856fa0bfa1c161c6f3b6953a
+Subproject commit 145ab1ed79d3fc1e8618040c3495f9cfd400f64c
diff --git a/src/ashell/jerry-code.c b/src/ashell/jerry-code.c
index e6235fe58..ae8b52be4 100644
--- a/src/ashell/jerry-code.c
+++ b/src/ashell/jerry-code.c
@@ -35,7 +35,7 @@ static jerry_value_t parsed_code = 0;
 void javascript_eval_code(const char *source_buffer, ssize_t size)
 {
     ZVAL ret_val = jerry_eval((jerry_char_t *)source_buffer, size, false);
-    if (jerry_value_has_error_flag(ret_val)) {
+    if (jerry_value_is_error(ret_val)) {
         printf("[ERR] failed to evaluate JS\n");
         zjs_print_error_message(ret_val, ZJS_UNDEFINED);
     }
@@ -63,8 +63,9 @@ int javascript_parse_code(const char *file_name)
 
     if (buf && size > 0) {
         /* Setup Global scope code */
-        parsed_code = jerry_parse((const jerry_char_t *)buf, size, false);
-        if (jerry_value_has_error_flag(parsed_code)) {
+        parsed_code = jerry_parse(NULL, 0, (const jerry_char_t *)buf, size,
+                                  JERRY_PARSE_NO_OPTS);
+        if (jerry_value_is_error(parsed_code)) {
             DBG_PRINT("Error parsing JS\n");
             zjs_print_error_message(parsed_code, ZJS_UNDEFINED);
             jerry_release_value(parsed_code);
@@ -85,7 +86,7 @@ void javascript_run_code(const char *file_name)
     /* Execute the parsed source code in the Global scope */
     ZVAL ret_value = jerry_run(parsed_code);
 
-    if (jerry_value_has_error_flag(ret_value)) {
+    if (jerry_value_is_error(ret_value)) {
         DBG_PRINT("Error running JS\n");
         zjs_print_error_message(ret_value, ZJS_UNDEFINED);
     }
diff --git a/src/jerry-port/zjs_jerry_port.c b/src/jerry-port/zjs_jerry_port.c
index a81432aee..c93914665 100644
--- a/src/jerry-port/zjs_jerry_port.c
+++ b/src/jerry-port/zjs_jerry_port.c
@@ -57,3 +57,12 @@ void jerry_port_log(jerry_log_level_t level, const char *format, ...)
 #endif /* JERRY_DEBUGGER */
     va_end(args);
 }
+
+void jerry_port_sleep (uint32_t sleep_time)
+{
+#ifdef ZJS_LINUX_BUILD
+    usleep ((useconds_t) sleep_time * 1000);
+#else
+    k_sleep ((useconds_t) sleep_time);
+#endif
+}
diff --git a/src/main.c b/src/main.c
index 7dc2097a7..53a5c36d6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -293,13 +293,13 @@ int main(int argc, char *argv[])
 #endif
 
 #ifndef ZJS_SNAPSHOT_BUILD
-    code_eval = jerry_parse_named_resource((jerry_char_t *)file_name,
-                                           file_name_len,
-                                           (jerry_char_t *)script,
-                                           script_len,
-                                           false);
+    code_eval = jerry_parse((jerry_char_t *)file_name,
+                            file_name_len,
+                            (jerry_char_t *)script,
+                            script_len,
+                            JERRY_PARSE_NO_OPTS);
 
-    if (jerry_value_has_error_flag(code_eval)) {
+    if (jerry_value_is_error(code_eval)) {
         DBG_PRINT("Error parsing JS\n");
         zjs_print_error_message(code_eval, ZJS_UNDEFINED);
         goto error;
@@ -311,12 +311,16 @@ int main(int argc, char *argv[])
 #endif
 
 #ifdef ZJS_SNAPSHOT_BUILD
-    result = jerry_exec_snapshot(snapshot_bytecode, snapshot_len, false);
+    result = jerry_exec_snapshot(snapshot_bytecode,
+                                 snapshot_len,
+                                 0,
+                                 JERRY_SNAPSHOT_EXEC_COPY_DATA);
+
 #else
     result = jerry_run(code_eval);
 #endif
 
-    if (jerry_value_has_error_flag(result)) {
+    if (jerry_value_is_error(result)) {
         DBG_PRINT("Error running JS\n");
         zjs_print_error_message(result, ZJS_UNDEFINED);
         goto error;
@@ -406,7 +410,7 @@ int main(int argc, char *argv[])
 #ifdef BUILD_MODULE_PROMISE
         // run queued jobs for promises
         result = jerry_run_all_enqueued_jobs();
-        if (jerry_value_has_error_flag(result)) {
+        if (jerry_value_is_error(result)) {
             DBG_PRINT("Error running JS in promise jobqueue\n");
             zjs_print_error_message(result, ZJS_UNDEFINED);
             goto error;
diff --git a/src/sensors/zjs_sensor_accel.c b/src/sensors/zjs_sensor_accel.c
index efa5544e1..50a9ff96f 100644
--- a/src/sensors/zjs_sensor_accel.c
+++ b/src/sensors/zjs_sensor_accel.c
@@ -47,7 +47,7 @@ static ZJS_DECL_FUNC(zjs_sensor_constructor)
         zjs_sensor_create, g_instance, SENSOR_CHAN_ACCEL_XYZ, ACCEL_DEVICE_NAME,
         0, 800, onchange, NULL, onstop);
 
-    if (!jerry_value_has_error_flag(sensor_obj)) {
+    if (!jerry_value_is_error(sensor_obj)) {
         ZVAL null_val = jerry_create_null();
         zjs_set_readonly_property(sensor_obj, "x", null_val);
         zjs_set_readonly_property(sensor_obj, "y", null_val);
diff --git a/src/sensors/zjs_sensor_gyro.c b/src/sensors/zjs_sensor_gyro.c
index 4d653a000..476e00038 100644
--- a/src/sensors/zjs_sensor_gyro.c
+++ b/src/sensors/zjs_sensor_gyro.c
@@ -47,7 +47,7 @@ static ZJS_DECL_FUNC(zjs_sensor_constructor)
         ZJS_CHAIN_FUNC_ARGS(zjs_sensor_create, g_instance, SENSOR_CHAN_GYRO_XYZ,
                             GYRO_DEVICE_NAME, 0, 800, onchange, NULL, onstop);
 
-    if (!jerry_value_has_error_flag(sensor_obj)) {
+    if (!jerry_value_is_error(sensor_obj)) {
         ZVAL null_val = jerry_create_null();
         zjs_set_readonly_property(sensor_obj, "x", null_val);
         zjs_set_readonly_property(sensor_obj, "y", null_val);
diff --git a/src/sensors/zjs_sensor_light.c b/src/sensors/zjs_sensor_light.c
index 5477f2e12..53cc261ee 100644
--- a/src/sensors/zjs_sensor_light.c
+++ b/src/sensors/zjs_sensor_light.c
@@ -41,7 +41,7 @@ static ZJS_DECL_FUNC(zjs_sensor_constructor)
         ZJS_CHAIN_FUNC_ARGS(zjs_sensor_create, g_instance, SENSOR_CHAN_LIGHT,
                             ADC_DEVICE_NAME, -1, 100, onchange, NULL, onstop);
 
-    if (!jerry_value_has_error_flag(sensor_obj)) {
+    if (!jerry_value_is_error(sensor_obj)) {
         ZVAL null_val = jerry_create_null();
         zjs_set_readonly_property(sensor_obj, "illuminance", null_val);
     }
diff --git a/src/sensors/zjs_sensor_magn.c b/src/sensors/zjs_sensor_magn.c
index dc2acc745..ea3a89c90 100644
--- a/src/sensors/zjs_sensor_magn.c
+++ b/src/sensors/zjs_sensor_magn.c
@@ -47,7 +47,7 @@ static ZJS_DECL_FUNC(zjs_sensor_constructor)
         ZJS_CHAIN_FUNC_ARGS(zjs_sensor_create, g_instance, SENSOR_CHAN_MAGN_XYZ,
                             MAGN_DEVICE_NAME, 0, 800, onchange, NULL, onstop);
 
-    if (!jerry_value_has_error_flag(sensor_obj)) {
+    if (!jerry_value_is_error(sensor_obj)) {
         ZVAL null_val = jerry_create_null();
         zjs_set_readonly_property(sensor_obj, "x", null_val);
         zjs_set_readonly_property(sensor_obj, "y", null_val);
diff --git a/src/sensors/zjs_sensor_temp.c b/src/sensors/zjs_sensor_temp.c
index d2ba0d11a..ee4d78cf3 100644
--- a/src/sensors/zjs_sensor_temp.c
+++ b/src/sensors/zjs_sensor_temp.c
@@ -41,7 +41,7 @@ static ZJS_DECL_FUNC(zjs_sensor_constructor)
         ZJS_CHAIN_FUNC_ARGS(zjs_sensor_create, g_instance, SENSOR_CHAN_TEMP,
                             TEMP_DEVICE_NAME, 0, 800, onchange, NULL, onstop);
 
-    if (!jerry_value_has_error_flag(sensor_obj)) {
+    if (!jerry_value_is_error(sensor_obj)) {
         ZVAL null_val = jerry_create_null();
         zjs_set_readonly_property(sensor_obj, "celsius", null_val);
     }
diff --git a/src/zjs_aio_a101.c b/src/zjs_aio_a101.c
index 1a143da4e..82e0a0110 100644
--- a/src/zjs_aio_a101.c
+++ b/src/zjs_aio_a101.c
@@ -239,7 +239,7 @@ static ZJS_DECL_FUNC(zjs_aio_open)
     send.data.aio.pin = pin;
 
     ZVAL result = zjs_aio_call_remote_function(&send);
-    if (jerry_value_has_error_flag(result))
+    if (jerry_value_is_error(result))
         return result;
 
     // create the AIOPin object
diff --git a/src/zjs_ble.c b/src/zjs_ble.c
index ad0c302f9..482a96af9 100644
--- a/src/zjs_ble.c
+++ b/src/zjs_ble.c
@@ -260,7 +260,7 @@ static void zjs_ble_read_c_callback(void *handle, const void *argv)
 
     jerry_value_t args[2] = { offset, callback };
     ZVAL rval = jerry_call_function(cb->js_callback, chrc->chrc_obj, args, 2);
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         DBG_PRINT("failed to call onReadRequest function\n");
     }
 }
@@ -366,7 +366,7 @@ static void zjs_ble_write_c_callback(void *handle, const void *argv)
 
     jerry_value_t args[4] = { buf_obj, offset, without_response, callback };
     ZVAL rval = jerry_call_function(cb->js_callback, chrc->chrc_obj, args, 4);
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         DBG_PRINT("failed to call onWriteRequest function\n");
     }
 }
@@ -444,7 +444,7 @@ static void zjs_ble_subscribe_c_callback(void *handle, const void *argv)
 
     jerry_value_t args[2] = { max_size, callback };
     ZVAL rval = jerry_call_function(cb->js_callback, chrc->chrc_obj, args, 2);
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         DBG_PRINT("failed to call onSubscribe function\n");
     }
 }
@@ -455,7 +455,7 @@ static void zjs_ble_unsubscribe_c_callback(void *handle, const void *argv)
     ble_notify_handle_t *cb = &chrc->unsubscribe_cb;
 
     ZVAL rval = jerry_call_function(cb->js_callback, chrc->chrc_obj, NULL, 0);
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         DBG_PRINT("failed to call onUnsubscribe function\n");
     }
 }
@@ -466,7 +466,7 @@ static void zjs_ble_notify_c_callback(void *handle, const void *argv)
     ble_notify_handle_t *cb = &chrc->notify_cb;
 
     ZVAL rval = jerry_call_function(cb->js_callback, chrc->chrc_obj, NULL, 0);
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         DBG_PRINT("failed to call onNotify function\n");
     }
 }
@@ -1212,7 +1212,7 @@ static ZJS_DECL_FUNC(zjs_ble_set_services)
         ZVAL arg = success ? ZJS_UNDEFINED
                            : jerry_create_string("failed to register services");
         ZVAL rval = jerry_call_function(argv[1], ZJS_UNDEFINED, &arg, 1);
-        if (jerry_value_has_error_flag(rval)) {
+        if (jerry_value_is_error(rval)) {
             DBG_PRINT("failed to call callback function\n");
         }
     }
diff --git a/src/zjs_callbacks.c b/src/zjs_callbacks.c
index 39e2a3d58..0068c559f 100644
--- a/src/zjs_callbacks.c
+++ b/src/zjs_callbacks.c
@@ -523,7 +523,7 @@ void zjs_call_callback(zjs_callback_id id, const void *data, u32_t sz)
             if (!jerry_value_is_undefined(cb_map[id]->js_func)) {
                 rval = jerry_call_function(cb_map[id]->js_func,
                                            cb_map[id]->this, values, sz);
-                if (jerry_value_has_error_flag(rval)) {
+                if (jerry_value_is_error(rval)) {
 #ifdef INSTRUMENT_CALLBACKS
                     DBG_PRINT("callback %d had error; creator: %s, "
                               "caller: %s\n",
diff --git a/src/zjs_event.c b/src/zjs_event.c
index 62e9f6f96..2edb11f0b 100644
--- a/src/zjs_event.c
+++ b/src/zjs_event.c
@@ -136,7 +136,7 @@ static ZJS_DECL_FUNC(add_listener)
     jerry_value_t rval = zjs_add_event_listener(this, name, argv[1]);
     zjs_free(name);
 
-    if (jerry_value_has_error_flag(rval)) {
+    if (jerry_value_is_error(rval)) {
         return rval;
     }
 
@@ -422,7 +422,7 @@ bool zjs_emit_event_priv(jerry_value_t obj, const char *event_name,
     listener_t *listener = event->listeners;
     while (listener) {
         ZVAL rval = jerry_call_function(listener->func, obj, argv, argc);
-        if (jerry_value_has_error_flag(rval)) {
+        if (jerry_value_is_error(rval)) {
             ERR_PRINT("error calling listener\n");
         }
         listener = listener->next;
diff --git a/src/zjs_gfx.c b/src/zjs_gfx.c
index 97e63de43..9c7532b3c 100644
--- a/src/zjs_gfx.c
+++ b/src/zjs_gfx.c
@@ -188,7 +188,7 @@ static jerry_value_t zjs_gfx_call_cb(u32_t x, u32_t y, u32_t w, u32_t h,
     jerry_value_t ret = jerry_call_function(gfxHandle->drawDataCB,
                                             gfxHandle->jsThis, args, 5);
 
-    if (jerry_value_has_error_flag(ret)) {
+    if (jerry_value_is_error(ret)) {
         ERR_PRINT("JS callback failed with %u..\n", (u32_t)ret);
         return ret;
     }
@@ -273,7 +273,7 @@ static jerry_value_t zjs_gfx_flush(gfx_handle_t *gfxHandle)
 
                     ret = zjs_gfx_call_cb(xStart, yStart, currW, currH,
                                           recBufObj, gfxHandle);
-                    if (jerry_value_has_error_flag(ret)) {
+                    if (jerry_value_is_error(ret)) {
                         zjs_gfx_reset_touched_pixels(gfxHandle);
                         return ret;
                     }
@@ -625,7 +625,7 @@ static ZJS_DECL_FUNC(zjs_gfx_draw_string)
 
         ret = zjs_gfx_draw_char_priv(x, argData.coords[1], argData.text[i],
                                      argData.color, argData.size, handle);
-        if (jerry_value_has_error_flag(ret)) {
+        if (jerry_value_is_error(ret)) {
             return ret;
         }
 
diff --git a/src/zjs_grove_lcd_ipm.c b/src/zjs_grove_lcd_ipm.c
index 36c724779..634379336 100644
--- a/src/zjs_grove_lcd_ipm.c
+++ b/src/zjs_grove_lcd_ipm.c
@@ -75,7 +75,7 @@ static jerry_value_t zjs_glcd_call_remote_function(zjs_ipm_message_t *send)
 static jerry_value_t zjs_glcd_call_remote_ignore(zjs_ipm_message_t *send)
 {
     ZVAL rval = zjs_glcd_call_remote_function(send);
-    if (jerry_value_has_error_flag(rval))
+    if (jerry_value_is_error(rval))
         return rval;
 
     return ZJS_UNDEFINED;
@@ -231,7 +231,7 @@ static ZJS_DECL_FUNC(zjs_glcd_init)
     send.type = TYPE_GLCD_INIT;
 
     ZVAL result = zjs_glcd_call_remote_function(&send);
-    if (jerry_value_has_error_flag(result)) {
+    if (jerry_value_is_error(result)) {
         return result;
     }
 
diff --git a/src/zjs_modules.c b/src/zjs_modules.c
index 930fc1304..ef32ea3fc 100644
--- a/src/zjs_modules.c
+++ b/src/zjs_modules.c
@@ -50,7 +50,7 @@ static bool javascript_eval_code(const char *source_buffer, ssize_t size,
                                  jerry_value_t *ret_val)
 {
     (*ret_val) = jerry_eval((jerry_char_t *)source_buffer, size, false);
-    if (jerry_value_has_error_flag(*ret_val)) {
+    if (jerry_value_is_error(*ret_val)) {
         ERR_PRINT("failed to evaluate JS\n");
         return false;
     }
@@ -114,7 +114,7 @@ static bool load_js_module_fs(const jerry_value_t module_name,
     }
 
     (*result) = jerry_eval((jerry_char_t *)str, len, false);
-    if (jerry_value_has_error_flag(*result)) {
+    if (jerry_value_is_error(*result)) {
         ERR_PRINT("failed to evaluate JS\n");
         ret = false;
     } else {
@@ -202,7 +202,7 @@ static ZJS_DECL_FUNC(native_require_handler)
 
     // Try each of the resolvers to see if we can find the requested module
     jerry_value_t result = jerryx_module_resolve(argv[0], resolvers, 3);
-    if (jerry_value_has_error_flag(result)) {
+    if (jerry_value_is_error(result)) {
         DBG_PRINT("Couldn't load module %s\n", module);
         return NOTSUPPORTED_ERROR("Module not found");
     } else {
@@ -279,12 +279,13 @@ void zjs_modules_check_load_file()
     size_t size;
     jerry_value_t parsed_code = 0;
     buf = read_file_alloc(load_file, &size);
-    parsed_code = jerry_parse((const jerry_char_t *)buf, size, false);
+    parsed_code = jerry_parse(NULL, 0, const jerry_char_t *)buf, size,
+                              JERRY_PARSE_NO_OPTS);
     zjs_free(buf);
 
-    if (!jerry_value_has_error_flag(parsed_code)) {
+    if (!jerry_value_is_error(parsed_code)) {
         ZVAL ret_value = jerry_run(parsed_code);
-        if (jerry_value_has_error_flag(ret_value)) {
+        if (jerry_value_is_error(ret_value)) {
             ERR_PRINT("Error running JS\n");
         }
     }
diff --git a/src/zjs_sensor.c b/src/zjs_sensor.c
index 92356f22b..4692b0fc5 100644
--- a/src/zjs_sensor.c
+++ b/src/zjs_sensor.c
@@ -171,7 +171,7 @@ void zjs_sensor_trigger_change(jerry_value_t obj)
         ZVAL event = zjs_create_object();
         // if onreading exists, call it
         ZVAL rval = jerry_call_function(func, obj, NULL, 0);
-        if (jerry_value_has_error_flag(rval)) {
+        if (jerry_value_is_error(rval)) {
             ERR_PRINT("Error calling onreading\n");
         }
     }
diff --git a/src/zjs_util.c b/src/zjs_util.c
index 7058ab480..d7ddfaff7 100644
--- a/src/zjs_util.c
+++ b/src/zjs_util.c
@@ -217,7 +217,7 @@ bool zjs_obj_get_boolean(jerry_value_t obj, const char *name, bool *flag)
     ZVAL value = zjs_get_property(obj, name);
     bool rval = false;
 
-    if (!jerry_value_has_error_flag(value) && jerry_value_is_boolean(value)) {
+    if (!jerry_value_is_error(value) && jerry_value_is_boolean(value)) {
         *flag = jerry_get_boolean_value(value);
         rval = true;
     }
@@ -237,7 +237,7 @@ bool zjs_obj_get_string(jerry_value_t obj, const char *name, char *buffer,
     ZVAL value = zjs_get_property(obj, name);
     bool rval = false;
 
-    if (!jerry_value_has_error_flag(value) && jerry_value_is_string(value)) {
+    if (!jerry_value_is_error(value) && jerry_value_is_string(value)) {
         jerry_size_t size = len;
         zjs_copy_jstring(value, buffer, &size);
         if (size)
@@ -254,7 +254,7 @@ bool zjs_obj_get_double(jerry_value_t obj, const char *name, double *num)
     ZVAL value = zjs_get_property(obj, name);
     bool rval = false;
 
-    if (!jerry_value_has_error_flag(value) && jerry_value_is_number(value)) {
+    if (!jerry_value_is_error(value) && jerry_value_is_number(value)) {
         *num = jerry_get_number_value(value);
         rval = true;
     }
@@ -269,7 +269,7 @@ bool zjs_obj_get_uint32(jerry_value_t obj, const char *name, u32_t *num)
     ZVAL value = zjs_get_property(obj, name);
     bool rval = false;
 
-    if (!jerry_value_has_error_flag(value) && jerry_value_is_number(value)) {
+    if (!jerry_value_is_error(value) && jerry_value_is_number(value)) {
         *num = (u32_t)jerry_get_number_value(value);
         rval = true;
     }
@@ -284,7 +284,7 @@ bool zjs_obj_get_int32(jerry_value_t obj, const char *name, s32_t *num)
     ZVAL value = zjs_get_property(obj, name);
     bool rval = false;
 
-    if (!jerry_value_has_error_flag(value) && jerry_value_is_number(value)) {
+    if (!jerry_value_is_error(value) && jerry_value_is_number(value)) {
         *num = (s32_t)jerry_get_number_value(value);
         rval = true;
     }
@@ -738,7 +738,7 @@ int zjs_validate_args(const char *expectations[], const jerry_length_t argc,
 int zjs_require_bool_if_prop(jerry_value_t obj, const char *prop, bool *result)
 {
     ZVAL value = zjs_get_property(obj, prop);
-    if (jerry_value_is_undefined(value) || jerry_value_has_error_flag(value)) {
+    if (jerry_value_is_undefined(value) || jerry_value_is_error(value)) {
         // not found; leave default
         return 0;
     }
@@ -755,7 +755,7 @@ int zjs_require_string_if_prop_map(jerry_value_t obj, const char *prop,
                                    str2int_t map[], int maxlen, int *result)
 {
     ZVAL value = zjs_get_property(obj, prop);
-    if (jerry_value_is_undefined(value) || jerry_value_has_error_flag(value)) {
+    if (jerry_value_is_undefined(value) || jerry_value_is_error(value)) {
         // not found; leave default
         return 0;
     }
diff --git a/tools/snapshot.c b/tools/snapshot.c
index f6f7f0e5b..3da3d6201 100644
--- a/tools/snapshot.c
+++ b/tools/snapshot.c
@@ -39,12 +39,13 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    size_t size = jerry_parse_and_save_snapshot((jerry_char_t *)script,
-                                                len,
-                                                true,
-                                                false,
-                                                snapshot_buf,
-                                                sizeof(snapshot_buf));
+    size_t size = jerry_generate_snapshot(NULL,
+                                          0,
+                                          (const jerry_char_t *)script,
+                                          len,
+                                          0,
+                                          snapshot_buf,
+                                          sizeof(snapshot_buf));
 
     if (script != NULL)
         free(script);