diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
new file mode 100644
index 0000000..ed89451
--- /dev/null
+++ b/.github/workflows/build_wheel.yml
@@ -0,0 +1,29 @@
+name: Build Wheels
+
+on:  
+  push:
+    tags:
+      - '*'
+env:
+  CIBW_SKIP: cp27-* cp33-* cp34-* cp35-* pp27* pp36* pp37*
+
+jobs:
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, windows-2019, macos-latest]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build wheels
+        uses: joerick/cibuildwheel@v1.10.0
+        # to supply options, put them in 'env', like:
+        env:
+          CIBW_BEFORE_BUILD: pip install oldest-supported-numpy
+
+      - uses: actions/upload-artifact@v2
+        with:
+          path: ./wheelhouse/*.whl
\ No newline at end of file
diff --git a/cc3d.cpp b/cc3d.cpp
index 856a7c6..dcf18bf 100644
--- a/cc3d.cpp
+++ b/cc3d.cpp
@@ -3078,7 +3078,7 @@ static const char __pyx_k_stop[] = "stop";
 static const char __pyx_k_test[] = "__test__";
 static const char __pyx_k_time[] = "time";
 static const char __pyx_k_view[] = "view";
-static const char __pyx_k_3_1_2[] = "3.1.2";
+static const char __pyx_k_3_2_1[] = "3.2.1";
 static const char __pyx_k_ASCII[] = "ASCII";
 static const char __pyx_k_array[] = "array";
 static const char __pyx_k_class[] = "__class__";
@@ -3257,7 +3257,7 @@ static const char __pyx_k_numpy_core_umath_failed_to_impor[] = "numpy.core.umath
 static const char __pyx_k_unable_to_allocate_shape_and_str[] = "unable to allocate shape and strides.";
 static const char __pyx_k_Only_6_18_and_26_connectivities_2[] = "Only 6, 18, and 26 connectivities are supported. Got: ";
 static const char __pyx_k_each_locals_InPlaceImageIterator_2[] = "each.<locals>.InPlaceImageIterator";
-static PyObject *__pyx_kp_u_3_1_2;
+static PyObject *__pyx_kp_u_3_2_1;
 static PyObject *__pyx_n_s_ASCII;
 static PyObject *__pyx_kp_s_Buffer_view_does_not_expose_stri;
 static PyObject *__pyx_n_u_C;
@@ -39141,7 +39141,7 @@ static struct PyModuleDef __pyx_moduledef = {
 #endif
 
 static __Pyx_StringTabEntry __pyx_string_tab[] = {
-  {&__pyx_kp_u_3_1_2, __pyx_k_3_1_2, sizeof(__pyx_k_3_1_2), 0, 1, 0, 0},
+  {&__pyx_kp_u_3_2_1, __pyx_k_3_2_1, sizeof(__pyx_k_3_2_1), 0, 1, 0, 0},
   {&__pyx_n_s_ASCII, __pyx_k_ASCII, sizeof(__pyx_k_ASCII), 0, 0, 1, 1},
   {&__pyx_kp_s_Buffer_view_does_not_expose_stri, __pyx_k_Buffer_view_does_not_expose_stri, sizeof(__pyx_k_Buffer_view_does_not_expose_stri), 0, 0, 1, 0},
   {&__pyx_n_u_C, __pyx_k_C, sizeof(__pyx_k_C), 0, 1, 0, 1},
@@ -40408,7 +40408,7 @@ if (!__Pyx_RefNanny) {
  * import numpy as np
  * import time             # <<<<<<<<<<<<<<
  * 
- * __VERSION__ = '3.1.2'
+ * __VERSION__ = '3.2.1'
  */
   __pyx_t_2 = __Pyx_Import(__pyx_n_s_time, 0, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 48, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
@@ -40418,11 +40418,11 @@ if (!__Pyx_RefNanny) {
   /* "cc3d.pyx":50
  * import time
  * 
- * __VERSION__ = '3.1.2'             # <<<<<<<<<<<<<<
+ * __VERSION__ = '3.2.1'             # <<<<<<<<<<<<<<
  * 
  * cdef extern from "cc3d.hpp" namespace "cc3d":
  */
-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_VERSION, __pyx_kp_u_3_1_2) < 0) __PYX_ERR(0, 50, __pyx_L1_error)
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_VERSION, __pyx_kp_u_3_2_1) < 0) __PYX_ERR(0, 50, __pyx_L1_error)
 
   /* "cc3d.pyx":98
  *   int64_t
diff --git a/cc3d.pyx b/cc3d.pyx
index f16ada8..38de1b9 100644
--- a/cc3d.pyx
+++ b/cc3d.pyx
@@ -47,7 +47,7 @@ cimport numpy as cnp
 import numpy as np
 import time
 
-__VERSION__ = '3.1.2'
+__VERSION__ = '3.2.1'
 
 cdef extern from "cc3d.hpp" namespace "cc3d":
   cdef uint32_t* connected_components3d[T,U](
diff --git a/setup.py b/setup.py
index 74356f4..e28e0cc 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ def requirements():
 
 setuptools.setup(
   name="connected-components-3d",
-  version="3.2.0",
+  version="3.2.1",
   setup_requires=['pbr', 'numpy'],
   install_requires=['numpy'],
   python_requires="~=3.6", # >= 3.6 < 4.0