diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64978c3..3bfdf23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,9 +2,9 @@ name: Build
 
 on:
   push:
-    branches: [ master, development, experimental ]
+    branches: [ master, development, experimental, test* ]
   pull_request:
-    branches: [ master, development, experimental ]
+    branches: [ master, development, experimental, test* ]
 
 jobs:
   build:
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
         runs-on: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
diff --git a/README.md b/README.md
index 6919e7f..09cff66 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [![Build](https://github.com/LEMS/pylems/actions/workflows/ci.yml/badge.svg)](https://github.com/LEMS/pylems/actions/workflows/ci.yml)
 [![Check LEMS examples](https://github.com/LEMS/pylems/actions/workflows/examples.yml/badge.svg)](https://github.com/LEMS/pylems/actions/workflows/examples.yml)
 [![Documentation Status](https://readthedocs.org/projects/pylems/badge/?version=latest)](https://pylems.readthedocs.io/en/latest/?badge=latest)
+[![PyPI](https://img.shields.io/pypi/v/pylems)](https://pypi.org/project/pylems/)
 
 A LEMS (http://lems.github.io/LEMS) simulator written in Python which can be used to run NeuroML2  models (see [here](https://docs.neuroml.org/Userdocs/Software/pyLEMS.html)).
 
diff --git a/lems/parser/LEMS.py b/lems/parser/LEMS.py
index c4dc22a..79d8400 100644
--- a/lems/parser/LEMS.py
+++ b/lems/parser/LEMS.py
@@ -647,7 +647,14 @@ def parse_constant(self, node):
         else:
             description = None
 
-        constant = Constant(name, value, dimension, description)
+        if "symbol" in node.lattrib:
+            symbol = node.lattrib["symbol"]
+        else:
+            symbol = None
+
+        constant = Constant(
+            name, value, dimension=dimension, description=description, symbol=symbol
+        )
 
         if self.current_component_type:
             self.current_component_type.add_constant(constant)
diff --git a/setup.cfg b/setup.cfg
index 3068171..a84acf1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = PyLEMS
-version = 0.6.4
+version = 0.6.5
 author = PyLEMS authors and contributors
 author_email = gautham@lisphacker.org, p.gleeson@gmail.com
 maintainer_email = p.gleeson@gmail.com
@@ -13,12 +13,11 @@ classifiers =
     License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)
     Natural Language :: English
     Operating System :: OS Independent
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Topic :: Scientific/Engineering
 license = LGPL-3.0-only