diff --git a/humanized_opening_hours/__init__.py b/humanized_opening_hours/__init__.py
index 6815209..91ebb3a 100644
--- a/humanized_opening_hours/__init__.py
+++ b/humanized_opening_hours/__init__.py
@@ -13,11 +13,6 @@
 """
 # flake8: noqa
 
-__version__ = "1.0.0b3"
-__appname__ = "osm_humanized_opening_hours"
-__author__ = "rezemika <reze.mika@gmail.com>"
-__licence__ = "AGPLv3"
-
 import os as _os
 import gettext as _gettext
 _gettext.install("HOH",
@@ -26,6 +21,7 @@
     )
 )
 
+from humanized_opening_hours.version import __version__, __appname__, __author__, __licence__
 from humanized_opening_hours.main import OHParser, sanitize, days_of_week
 from humanized_opening_hours.temporal_objects import easter_date
 from humanized_opening_hours.rendering import AVAILABLE_LOCALES
diff --git a/humanized_opening_hours/field.ebnf b/humanized_opening_hours/field.ebnf
index 852b2b1..56bff5a 100644
--- a/humanized_opening_hours/field.ebnf
+++ b/humanized_opening_hours/field.ebnf
@@ -6,11 +6,11 @@ EVENT : "dawn" | "sunrise" | "sunset" | "dusk"
 EASTER : "easter"
 OPEN : " open"
 CLOSED : " closed" | " off"
-ALWAYS_OPEN.2 : "24/7"
-WEEK.2 : "week "
+ALWAYS_OPEN : "24/7"
+WEEK : "week "
 
 TWO_DIGITS.1 : /[0-9][0-9]+/
-YEAR.3 : /([12][0-9]{3})+/
+YEAR : /([12][0-9]{3})+/
 
 PLUS_OR_MINUS : "+" | "-"
 
diff --git a/humanized_opening_hours/version.py b/humanized_opening_hours/version.py
new file mode 100644
index 0000000..52295be
--- /dev/null
+++ b/humanized_opening_hours/version.py
@@ -0,0 +1,4 @@
+__version__ = "1.0.0b3"
+__appname__ = "osm_humanized_opening_hours"
+__author__ = "rezemika <reze.mika@gmail.com>"
+__licence__ = "AGPLv3"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3d70faf..b42ebc5 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,8 +1,8 @@
 astral==1.7.1
-Babel==2.6.0
+Babel==2.9.0
+pytz==2020.5
+lark-parser==0.11.1
 flake8==3.6.0
-lark-parser==0.6.5
 pyflakes==2.0.0
-pytz==2018.7
 twine==1.12.1
 requests==2.20.1
diff --git a/requirements.txt b/requirements.txt
index 391a4cd..957828f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 astral==1.7.1
-Babel==2.6.0
-pytz==2018.7
-lark-parser==0.6.5
+Babel==2.9.0
+pytz==2020.5
+lark-parser==0.11.1
diff --git a/setup.py b/setup.py
index 563c04d..2ac311e 100644
--- a/setup.py
+++ b/setup.py
@@ -1,13 +1,13 @@
 from setuptools import setup, find_packages
 import os
 
-import humanized_opening_hours
-
 BASE_DIR = os.path.dirname(os.path.realpath(__file__))
+exec(open(os.path.join(
+    BASE_DIR, 'humanized_opening_hours', 'version.py')).read())
 
 setup(
     name="osm_humanized_opening_hours",
-    version=humanized_opening_hours.__version__,
+    version=__version__,  # noqa
     packages=find_packages(exclude=["doc", "tests"]),
     author="rezemika",
     author_email="reze.mika@gmail.com",