Requires pyparsing >= 1.5.0, as 1.4.x will not work

contrib/requirements/default.txt

@@ -2,4 +2,4 @@ python-dateutil
 sqlalchemy
 anyjson
 kombu>=0.9.1
-pyparsing
+pyparsing>=1.5.0

setup.cfg

@@ -44,4 +44,4 @@ requires = uuid
            anyjson
            kombu >= 0.9.1
            SQLAlchemy
-           pyparsing
+           pyparsing >= 1.5.0

setup.py

@@ -142,7 +142,7 @@ install_requires.extend([
     "python-dateutil",
     "anyjson",
     "kombu>=0.9.1",
-    "pyparsing",
+    "pyparsing>=1.5.0",
 ])
 
 py_version = sys.version_info