diff --git a/requirements.txt b/requirements.txt
index 7d2f3f5..9d73a97 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 Markdown==2.6.8
 Pygments==1.6
 Jinja2==2.7.3
-PyYAML==3.11
+PyYAML==5.1
 docopt==0.6.1
 ordereddict==1.1
 watchdog==0.8.3
diff --git a/simiki/config.py b/simiki/config.py
index c0a1ef3..790178b 100644
--- a/simiki/config.py
+++ b/simiki/config.py
@@ -61,7 +61,7 @@ def parse_config(config_file):
     default_config = _set_default_config()
 
     with io.open(config_file, "rt", encoding="utf-8") as fd:
-        config = yaml.load(fd)
+        config = yaml.load(fd, Loader=yaml.FullLoader)
 
     default_config.update(config)
     config = _post_process(default_config)
diff --git a/simiki/generators.py b/simiki/generators.py
index 9816df0..148908b 100644
--- a/simiki/generators.py
+++ b/simiki/generators.py
@@ -208,7 +208,7 @@ class PageGenerator(BaseGenerator):
     def parse_meta(self, yaml_str):
         """Parse meta from yaml string, and validate yaml filed, return dict"""
         try:
-            meta = yaml.load(yaml_str)
+            meta = yaml.load(yaml_str, Loader=yaml.FullLoader)
         except yaml.YAMLError as e:
             e.extra_msg = 'yaml format error'
             raise