diff --git a/.github/workflows/build_flake_pytest_ubuntu2004.yml b/.github/workflows/build_flake_pytest_ubuntu2004.yml
index b762e56c..e80c3e8c 100644
--- a/.github/workflows/build_flake_pytest_ubuntu2004.yml
+++ b/.github/workflows/build_flake_pytest_ubuntu2004.yml
@@ -15,8 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["2.7", "3.8", "3.11", "3.x"]
-
+        python-version: ["2.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/ImageD11/stress.py b/ImageD11/stress.py
index 2f6d333f..809a1801 100644
--- a/ImageD11/stress.py
+++ b/ImageD11/stress.py
@@ -88,8 +88,8 @@ def __init__(self,
         
         
     def __str__(self):
-        return f"EpsSigSolver:\n phase name: {self.phase_name}\n reference unitcell: {self.unitcell}\n symmetry:" +\
-               f"{self.symmetry}\n unit:{self.stress_unit}\n Stiffness:\n {self.Cij}\n  n ubis: {len(self.UBIs)}"
+        return ("EpsSigSolver:\n phase name: {phase_name}\n reference unitcell: {unitcell}\n symmetry:" +\
+               "{symmetry}\n unit:{stress_unit}\n Stiffness:\n {Cij}\n  n ubis: {nUBIs)}").format(self)
 
     # Load / save / update functions for parameters (from former eps_sig_solver.py)
     ########################################
diff --git a/README.md b/README.md
index 708a73a7..54236587 100644
--- a/README.md
+++ b/README.md
@@ -59,9 +59,14 @@ Good luck!
 
 ## CI Status
 
+[![Flake, Build and PyTest](https://github.com/FABLE-3DXRD/ImageD11/actions/workflows/build_flake_pytest_ubuntu2004.yml/badge.svg)](https://github.com/FABLE-3DXRD/ImageD11/actions/workflows/build_flake_pytest_ubuntu2004.yml)
+
+<!--
+
 Windows: [![Build status](https://ci.appveyor.com/api/projects/status/4pdlvsj2grtk0hel?svg=true)](https://ci.appveyor.com/project/jonwright/imaged11)
 
 Linux: [![CircleCI](https://circleci.com/gh/jonwright/ImageD11.svg?style=svg)](https://circleci.com/gh/jonwright/ImageD11)
 
 Macos + Linux [![Build Status](https://travis-ci.com/jonwright/ImageD11.svg?branch=master)](https://travis-ci.com/jonwright/ImageD11)
 
+-->
diff --git a/setup.py b/setup.py
index 7d996203..9fc9baf3 100644
--- a/setup.py
+++ b/setup.py
@@ -202,6 +202,7 @@ def build_extension(self, ext):
       cmdclass={ 'build_ext' : build_ext_subclass },
       description='ImageD11',
       license = "GPL",
+      python_requires='<3.12',  # Numba still not working for 3.12
       ext_package = "ImageD11",   # Puts extensions in the ImageD11 directory
       ext_modules = [extension,],
       setup_requires = minimal,   # to compile