diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c10fce9..2025f37 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python: ["3.11", "3.10", "3.9", "3.8", "3.7", "3.6", "3.5"]
+        python: ["3.10", "3.9", "3.8", "3.7", "3.6", "3.5"]
     steps:
       - uses: actions/checkout@v2
         with:
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..a3df0f6
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,128 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "95ef8703d7634e08c4c5796f1048e73f05018cf1a3830744112fac97d89be0e6"
+        },
+        "pipfile-spec": 6,
+        "requires": {},
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {},
+    "develop": {
+        "atomicwrites": {
+            "hashes": [
+                "sha256:81b2c9071a49367a7f770170e5eec8cb66567cfbbc8c73d20ce5ca4a8d71cf11"
+            ],
+            "markers": "sys_platform == 'win32'",
+            "version": "==1.4.1"
+        },
+        "exceptiongroup": {
+            "hashes": [
+                "sha256:232c37c63e4f682982c8b6459f33a8981039e5fb8756b2074364e5055c498c9e",
+                "sha256:d484c3090ba2889ae2928419117447a14daf3c1231d5e30d0aae34f354f01785"
+            ],
+            "markers": "python_version < '3.11'",
+            "version": "==1.1.1"
+        },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:43dd286a2cd8995d5eaef7fee2066340423b818ed3fd70adf0bad5f1fac53fed",
+                "sha256:92501cdf9cc66ebd3e612f1b4f0c0765dfa42f0fa38ffb319b6bd84dd675d705"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==6.6.0"
+        },
+        "iniconfig": {
+            "hashes": [
+                "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3",
+                "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==2.0.0"
+        },
+        "numpy": {
+            "hashes": [
+                "sha256:0ec87a7084caa559c36e0a2309e4ecb1baa03b687201d0a847c8b0ed476a7187",
+                "sha256:1a7d6acc2e7524c9955e5c903160aa4ea083736fde7e91276b0e5d98e6332812",
+                "sha256:202de8f38fc4a45a3eea4b63e2f376e5f2dc64ef0fa692838e31a808520efaf7",
+                "sha256:210461d87fb02a84ef243cac5e814aad2b7f4be953b32cb53327bb49fd77fbb4",
+                "sha256:2d926b52ba1367f9acb76b0df6ed21f0b16a1ad87c6720a1121674e5cf63e2b6",
+                "sha256:352ee00c7f8387b44d19f4cada524586f07379c0d49270f87233983bc5087ca0",
+                "sha256:35400e6a8d102fd07c71ed7dcadd9eb62ee9a6e84ec159bd48c28235bbb0f8e4",
+                "sha256:3c1104d3c036fb81ab923f507536daedc718d0ad5a8707c6061cdfd6d184e570",
+                "sha256:4719d5aefb5189f50887773699eaf94e7d1e02bf36c1a9d353d9f46703758ca4",
+                "sha256:4749e053a29364d3452c034827102ee100986903263e89884922ef01a0a6fd2f",
+                "sha256:5342cf6aad47943286afa6f1609cad9b4266a05e7f2ec408e2cf7aea7ff69d80",
+                "sha256:56e48aec79ae238f6e4395886b5eaed058abb7231fb3361ddd7bfdf4eed54289",
+                "sha256:76e3f4e85fc5d4fd311f6e9b794d0c00e7002ec122be271f2019d63376f1d385",
+                "sha256:7776ea65423ca6a15255ba1872d82d207bd1e09f6d0894ee4a64678dd2204078",
+                "sha256:784c6da1a07818491b0ffd63c6bbe5a33deaa0e25a20e1b3ea20cf0e43f8046c",
+                "sha256:8535303847b89aa6b0f00aa1dc62867b5a32923e4d1681a35b5eef2d9591a463",
+                "sha256:9a7721ec204d3a237225db3e194c25268faf92e19338a35f3a224469cb6039a3",
+                "sha256:a1d3c026f57ceaad42f8231305d4653d5f05dc6332a730ae5c0bea3513de0950",
+                "sha256:ab344f1bf21f140adab8e47fdbc7c35a477dc01408791f8ba00d018dd0bc5155",
+                "sha256:ab5f23af8c16022663a652d3b25dcdc272ac3f83c3af4c02eb8b824e6b3ab9d7",
+                "sha256:ae8d0be48d1b6ed82588934aaaa179875e7dc4f3d84da18d7eae6eb3f06c242c",
+                "sha256:c91c4afd8abc3908e00a44b2672718905b8611503f7ff87390cc0ac3423fb096",
+                "sha256:d5036197ecae68d7f491fcdb4df90082b0d4960ca6599ba2659957aafced7c17",
+                "sha256:d6cc757de514c00b24ae8cf5c876af2a7c3df189028d68c0cb4eaa9cd5afc2bf",
+                "sha256:d933fabd8f6a319e8530d0de4fcc2e6a61917e0b0c271fded460032db42a0fe4",
+                "sha256:ea8282b9bcfe2b5e7d491d0bf7f3e2da29700cec05b49e64d6246923329f2b02",
+                "sha256:ecde0f8adef7dfdec993fd54b0f78183051b6580f606111a6d789cd14c61ea0c",
+                "sha256:f21c442fdd2805e91799fbe044a7b999b8571bb0ab0f7850d0cb9641a687092b"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==1.24.3"
+        },
+        "packaging": {
+            "hashes": [
+                "sha256:994793af429502c4ea2ebf6bf664629d07c1a9fe974af92966e4b8d2df7edc61",
+                "sha256:a392980d2b6cffa644431898be54b0045151319d1e7ec34f0cfed48767dd334f"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==23.1"
+        },
+        "pluggy": {
+            "hashes": [
+                "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159",
+                "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==1.0.0"
+        },
+        "pytest": {
+            "hashes": [
+                "sha256:3799fa815351fea3a5e96ac7e503a96fa51cc9942c3753cda7651b93c1cfa362",
+                "sha256:434afafd78b1d78ed0addf160ad2b77a30d35d4bdf8af234fe621919d9ed15e3"
+            ],
+            "index": "pypi",
+            "version": "==7.3.1"
+        },
+        "python-openctm": {
+            "path": ".",
+            "version": "==1.0.11"
+        },
+        "tomli": {
+            "hashes": [
+                "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc",
+                "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"
+            ],
+            "markers": "python_version < '3.11'",
+            "version": "==2.0.1"
+        },
+        "trimesh": {
+            "hashes": [
+                "sha256:5ae1ca5e4f4a5f41aa79067a9c39e083e37d7148022bb150cb0e6f89ec614df3",
+                "sha256:74741bc7f9fcb94b98951db8dc8ec8364a2ef52ac2ca0761c7ba06182ef329be"
+            ],
+            "index": "pypi",
+            "version": "==3.21.5"
+        }
+    }
+}
diff --git a/README.md b/README.md
index 0a3849b..09acffc 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Python-OpenCTM
 
 Python-OpenCTM is a Python interface for the [OpenCTM](https://github.com/Danny02/OpenCTM) file format. A format that allows a geometry to be compressed to a fraction of comparable file formats (3DS, STL, COLLADA...).
 
-Pre-built python (**3.5**-**3.8**) wheels available for **Linux**, **MacOS** and **Windows**
+Pre-built python (**3.5**-**3.10**) wheels available for **Linux**, **MacOS** and **Windows**
 
 ## Installation
 
diff --git a/openctm/io.py b/openctm/io.py
index 06781f2..8e8d663 100644
--- a/openctm/io.py
+++ b/openctm/io.py
@@ -29,13 +29,13 @@ def import_mesh(_filename):
         vertex_ctm = ctmGetFloatArray(ctm_context, CTM_VERTICES)
 
         vertices = np.fromiter(vertex_ctm,
-                               dtype=np.float,
+                               dtype=float,
                                count=vertex_count * 3).reshape((-1, 3))
 
         # read faces
         face_count = ctmGetInteger(ctm_context, CTM_TRIANGLE_COUNT)
         face_ctm = ctmGetIntegerArray(ctm_context, CTM_INDICES)
-        faces = np.fromiter(face_ctm, dtype=np.int,
+        faces = np.fromiter(face_ctm, dtype=int,
                             count=face_count * 3).reshape((-1, 3))
 
         # read face normals
@@ -43,7 +43,7 @@ def import_mesh(_filename):
         if ctmGetInteger(ctm_context, CTM_HAS_NORMALS) == CTM_TRUE:
             normals_ctm = ctmGetFloatArray(ctm_context, CTM_NORMALS)
             normals = np.fromiter(normals_ctm,
-                                  dtype=np.float,
+                                  dtype=float,
                                   count=face_count * 3).reshape((-1, 3))
     finally:
         ctmFreeContext(ctm_context)
diff --git a/openctm/version.py b/openctm/version.py
index b49950b..0fb5dff 100644
--- a/openctm/version.py
+++ b/openctm/version.py
@@ -1 +1 @@
-__version__ = '1.0.11'
+__version__ = '1.0.12'