diff --git a/setup.py b/setup.py
index d65a036..8ed68e7 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@ def readme():
             'lark-parser>=0.9.0',
             # pyrsistent is a dependency of jsonschema but py2 is not
             # supported beyond 0.16.0
-            'pyrsistent<0.17.0; python_version=="2.7"',
+            'pyrsistent<0.18.0; python_version=="2.7"',
             'jsonschema>=2.0',
             'jsonref==0.2',
             'click; python_version>="3.0.0"',