diff --git a/NEWS b/NEWS
index f4e03adc..d55a0efc 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+1.2.3.dev0
+ * #88: Fix declared pykwalify compatibility version range in setup.py to prevent use of ancient
+   versions of pykwalify with large version numbers.
+
 1.2.2
  * #85: Fix compatibility issue between pykwalify and ruamel.yaml 0.15.52, which manifested in
    borgmatic as a pykwalify RuleError.
diff --git a/setup.py b/setup.py
index 329b07cc..bc2891e0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 
 
-VERSION = '1.2.2'
+VERSION = '1.2.3.dev0'
 
 
 setup(
@@ -32,7 +32,7 @@ setup(
         'atticmatic',
     ],
     install_requires=(
-        'pykwalify>=1.6.0',
+        'pykwalify>=1.6.0,<14.06',
         'ruamel.yaml>0.15.0,<0.16.0',
         'setuptools',
     ),