diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index 3d27610..25676b0 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -28,13 +28,13 @@ jobs:
         uses: docker/setup-qemu-action@v1
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.19.1
+        uses: pypa/cibuildwheel@v2.22.0
         # to supply options, put them in 'env', like:
         env:
           CIBW_ARCHS_LINUX: ${{matrix.arch}}
           CIBW_BEFORE_BUILD: pip install numpy setuptools wheel cython 
           CIBW_ARCHS_MACOS: "x86_64 arm64"
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bab383a..63e33c3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,7 +27,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install cython numpy setuptools wheel
-        pip install -r requirements.txt pytest 
+        pip install -r requirements.txt -r requirements-dev.txt 
         pip install -e .
     - name: Test with pytest
       run: |
diff --git a/automated_test.py b/automated_test.py
index a0a653a..788acef 100644
--- a/automated_test.py
+++ b/automated_test.py
@@ -8,6 +8,11 @@
 import kimimaro.skeletontricks
 from kimimaro.utility import moving_average
 
+@pytest.fixture
+def connectomics_data():
+  import crackle
+  return crackle.load("benchmarks/connectomics.npy.ckl.gz")
+
 def test_empty_image():
   labels = np.zeros( (256, 256, 256), dtype=bool)  
   skels = kimimaro.skeletonize(labels, fix_borders=True)
@@ -502,7 +507,8 @@ def test_moving_average():
   assert np.all(res == ans)
   assert len(ans) == len(data)
 
-
+def test_no_fix_branching(connectomics_data):
+  kimimaro.skeletonize(connectomics_data[:,:,100], fix_branching=False)
 
 
 
diff --git a/benchmarks/README.md b/benchmarks/README.md
index c03637b..bec2d41 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -1,6 +1,8 @@
 Benchmarks
 ==========
 
+To open `connectomics.npy.ckl.gz` you must use [`crackle-codec`](https://github.com/seung-lab/crackle).
+
 Except where noted, these benchmarks were executed on an 2.8 GHz Dual-Core Intel Core i7 with 1600 MHz DDR3 RAM. The data source used was `connectomics.npy` which can be found in this repository. `connectomics.npy` is a 32-bit 512x512x512 cutout of mouse visual cortex at 16nm x 16nm x 40nm resolution that contains 2124 connected components including a partial cell body and a large glia fragment.
 
 Below, we compared the run time and peak memory usage of Kimimaro across many versions that contained performance significant updates. Due to the annoying length of each run, each value represents a single run, so there is some random perturbation around the true mean that can obscure the value of small improvements. Version 0.4.2 can be considered the first "feature complete" version that includes quality improvements like fix_branches, fix_borders, and a reasonable root selected for the cell body.
diff --git a/benchmarks/benchmark.py b/benchmarks/benchmark.py
index fdfabf0..571c8f0 100644
--- a/benchmarks/benchmark.py
+++ b/benchmarks/benchmark.py
@@ -1,8 +1,9 @@
 import time
 import numpy as np
 import kimimaro
+import crackle
 
-labels = np.load("connectomics.npy")
+labels = crackle.load("connectomics.npy.ckl.gz")
 
 s = time.time()
 skels = kimimaro.skeletonize(
diff --git a/benchmarks/connectomics.npy.ckl.gz b/benchmarks/connectomics.npy.ckl.gz
new file mode 100644
index 0000000..bceb440
Binary files /dev/null and b/benchmarks/connectomics.npy.ckl.gz differ
diff --git a/benchmarks/connectomics.npy.lzma b/benchmarks/connectomics.npy.lzma
deleted file mode 100644
index 0488f49..0000000
Binary files a/benchmarks/connectomics.npy.lzma and /dev/null differ
diff --git a/kimimaro/trace.py b/kimimaro/trace.py
index 62aea79..e41efbe 100644
--- a/kimimaro/trace.py
+++ b/kimimaro/trace.py
@@ -152,7 +152,7 @@ def trace(
   # pointers from each voxel to its parent. Then we can rapidly
   # compute multiple paths by simply hopping pointers using path_from_parents
   if not fix_branching:
-    parents = dijkstra3d.parental_field(PDRF, root, voxel_graph)
+    parents = dijkstra3d.parental_field(PDRF, root, voxel_graph=voxel_graph)
     del PDRF
   else:
     parents = PDRF
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..4536535
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,2 @@
+pytest
+crackle-codec
\ No newline at end of file