diff --git a/.github/workflows/tox-tests.yml b/.github/workflows/tox-tests.yml
index 698cf3f2..c07e0e5c 100644
--- a/.github/workflows/tox-tests.yml
+++ b/.github/workflows/tox-tests.yml
@@ -26,18 +26,20 @@ jobs:
         # Only run on ubuntu by default, but can add other os's to the test matrix here.
         # For example -- os: [ubuntu-latest, macos-latest, windows-latest]
         # windows-latest not possible due to how temp files are used in tests currently
-        os: [ubuntu-latest, macos-latest]
+        # macos failing due to an issue installing h5py - KDG 14may24
+        # os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
 
         # Test python version 3.x
-        python-ver: [9, 10, 11]
+        python-ver: [10, 11, 12]
 
         # Specify which tox environments to test in this list.
         # tox-env: [cov, alldeps, devdeps, astropylts]
         tox-env: [alldeps]
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up python 3.${{ matrix.python-ver }} with tox environment py3${{ matrix.python-ver }}-${{ matrix.tox-env }} on ${{ matrix.os }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
         python-version: 3.${{ matrix.python-ver }}
     - name: Install base dependencies
@@ -71,36 +73,36 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up python for astropy lts test
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: 3.11
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install tox
     - name: Test with tox
       run: |
-        tox -e py39-astropylts
+        tox -e py311-astropylts
 
   # Coverage test
   cov_test:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up python for coverage test
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.11
+        python-version: 3.12
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install tox
     - name: Test with tox
       run: |
-        tox -e py311-cov -- --remote-data
+        tox -e py312-cov -- --remote-data
     - name: Upload coverage to codecov
       uses: codecov/codecov-action@v1
       with:
@@ -119,11 +121,11 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python to build docs with sphinx
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.11
+        python-version: 3.12
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
@@ -139,11 +141,11 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Python codestyle check
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.11
+        python-version: 3.12
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/beast/plotting/plot_graphic_file_flow.py b/beast/plotting/plot_graphic_file_flow.py
index 4c464f75..dabbd4aa 100644
--- a/beast/plotting/plot_graphic_file_flow.py
+++ b/beast/plotting/plot_graphic_file_flow.py
@@ -86,7 +86,7 @@ def plot_graphic_file_flow_sd(n_sd=1, n_sub=3, savefig="png"):
     # iterate through source density bins
     for s in range(n_sd):
 
-        curr_sd = f"SD{s}-{s+1}"
+        curr_sd = f"SD{s}-{s + 1}"
 
         # files for this source density bin
         sg1.node(f"phot{s}", f"phot_{curr_sd}")
@@ -273,9 +273,9 @@ def plot_graphic_file_flow_subgrid(n_sg=3, savefig="png"):
         edges_invis[f"sed{s}"].append(f"obs{s}")
         edges_invis[f"sed{s}t"].append(f"obs{s}t")
         if s < n_sg - 1:
-            edges_invis[f"obs{s}"].append(f"sed{s+1}")
-            edges_invis[f"obs{s}t"].append(f"sed{s+1}t")
-            edges_invis[f"lnps_{s}"].append(f"lnps_{s+1}")
+            edges_invis[f"obs{s}"].append(f"sed{s + 1}")
+            edges_invis[f"obs{s}t"].append(f"sed{s + 1}t")
+            edges_invis[f"lnps_{s}"].append(f"lnps_{s + 1}")
         # output files
         edges_invis[f"stat{s}"].append(f"pdf1d{s}")
         edges_invis[f"pdf1d{s}"].append(f"pdf2d{s}")
diff --git a/tox.ini b/tox.ini
index 8b533b6a..9511c33c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{39,310,311}-test{,-alldeps}{,-cov}
+    py{310,311,312}-test{,-alldeps}{,-cov}
     build_docs
     linkcheck
     codestyle