--- /util/species-gen.py	2019-04-18 23:19:07.444170831 -0500
+++ /util/species-gen.py	2019-04-18 23:20:19.958169533 -0500
@@ -417,7 +417,7 @@
             continue
         f_path = os.path.join(args.datadir, f_name)
         try:
-            species_spec = yaml.load(open(f_path))
+            species_spec = yaml.safe_load(open(f_path))
         except yaml.YAMLError as e:
             print("Failed to load %s: %s" % (f_name, e))
             sys.exit(1)