diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 91fc1ec..3c3e6a3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,7 +27,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install Poetry
-        run: python -m pip install poetry==1.8.1
+        run: python -m pip install poetry==1.8.2
       - name: Install dependencies
         run: python -m poetry install
       - name: Test
diff --git a/bento_wes/utils.py b/bento_wes/utils.py
index ee0c07d..c030967 100644
--- a/bento_wes/utils.py
+++ b/bento_wes/utils.py
@@ -1,8 +1,8 @@
-from datetime import datetime
+from datetime import datetime, timezone
 
 
 __all__ = ["iso_now"]
 
 
 def iso_now() -> str:
-    return datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%SZ")  # ISO date format
+    return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")  # ISO date format
diff --git a/poetry.lock b/poetry.lock
index 40b6fb9..06f7e7c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -195,13 +195,13 @@ tests-no-zope = ["attrs[tests-mypy]", "cloudpickle", "hypothesis", "pympler", "p
 
 [[package]]
 name = "bento-lib"
-version = "11.5.2"
+version = "11.5.3"
 description = "A set of common utilities and helpers for Bento platform services."
 optional = false
-python-versions = ">=3.10,<4.0"
+python-versions = "<4.0,>=3.10"
 files = [
-    {file = "bento_lib-11.5.2-py3-none-any.whl", hash = "sha256:a4027469c208028d5456bd747782f485c6b29d17d8d0c80293c60aea48bab21f"},
-    {file = "bento_lib-11.5.2.tar.gz", hash = "sha256:bcb5f617df61aab43276ae26e70cbf09498baf490315ff7a180d56e910ca54d8"},
+    {file = "bento_lib-11.5.3-py3-none-any.whl", hash = "sha256:9a73bb54e9c03eedac76aaaa3375cccbec92ec745d42f6daed0f0a47c2a65281"},
+    {file = "bento_lib-11.5.3.tar.gz", hash = "sha256:bd481ac387cb47de0822376e1b50d4676bdc8b4d967d5cbeec3a24d007b3f77d"},
 ]
 
 [package.dependencies]
@@ -620,13 +620,13 @@ test = ["pytest (>=6)"]
 
 [[package]]
 name = "filelock"
-version = "3.13.3"
+version = "3.13.4"
 description = "A platform independent file lock."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "filelock-3.13.3-py3-none-any.whl", hash = "sha256:5ffa845303983e7a0b7ae17636509bc97997d58afeafa72fb141a17b152284cb"},
-    {file = "filelock-3.13.3.tar.gz", hash = "sha256:a79895a25bbefdf55d1a2a0a80968f7dbb28edcd6d4234a0afb3f37ecde4b546"},
+    {file = "filelock-3.13.4-py3-none-any.whl", hash = "sha256:404e5e9253aa60ad457cae1be07c0f0ca90a63931200a47d9b6a6af84fd7b45f"},
+    {file = "filelock-3.13.4.tar.gz", hash = "sha256:d13f466618bfde72bd2c18255e269f72542c6e70e7bac83a0232d6b1cc5c8cf4"},
 ]
 
 [package.extras]
@@ -773,13 +773,13 @@ files = [
 
 [[package]]
 name = "idna"
-version = "3.6"
+version = "3.7"
 description = "Internationalized Domain Names in Applications (IDNA)"
 optional = false
 python-versions = ">=3.5"
 files = [
-    {file = "idna-3.6-py3-none-any.whl", hash = "sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f"},
-    {file = "idna-3.6.tar.gz", hash = "sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca"},
+    {file = "idna-3.7-py3-none-any.whl", hash = "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"},
+    {file = "idna-3.7.tar.gz", hash = "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc"},
 ]
 
 [[package]]
@@ -858,13 +858,13 @@ referencing = ">=0.31.0"
 
 [[package]]
 name = "kombu"
-version = "5.3.6"
+version = "5.3.7"
 description = "Messaging library for Python."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "kombu-5.3.6-py3-none-any.whl", hash = "sha256:49f1e62b12369045de2662f62cc584e7df83481a513db83b01f87b5b9785e378"},
-    {file = "kombu-5.3.6.tar.gz", hash = "sha256:f3da5b570a147a5da8280180aa80b03807283d63ea5081fcdb510d18242431d9"},
+    {file = "kombu-5.3.7-py3-none-any.whl", hash = "sha256:5634c511926309c7f9789f1433e9ed402616b56836ef9878f01bd59267b4c7a9"},
+    {file = "kombu-5.3.7.tar.gz", hash = "sha256:011c4cd9a355c14a1de8d35d257314a1d2456d52b7140388561acac3cf1a97bf"},
 ]
 
 [package.dependencies]
@@ -1466,6 +1466,7 @@ files = [
     {file = "PyYAML-6.0.1-cp311-cp311-win_amd64.whl", hash = "sha256:bf07ee2fef7014951eeb99f56f39c9bb4af143d8aa3c21b1677805985307da34"},
     {file = "PyYAML-6.0.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:855fb52b0dc35af121542a76b9a84f8d1cd886ea97c84703eaa6d88e37a2ad28"},
     {file = "PyYAML-6.0.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:40df9b996c2b73138957fe23a16a4f0ba614f4c0efce1e9406a184b6d07fa3a9"},
+    {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a08c6f0fe150303c1c6b71ebcd7213c2858041a7e01975da3a99aed1e7a378ef"},
     {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6c22bec3fbe2524cde73d7ada88f6566758a8f7227bfbf93a408a9d86bcc12a0"},
     {file = "PyYAML-6.0.1-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:8d4e9c88387b0f5c7d5f281e55304de64cf7f9c0021a3525bd3b1c542da3b0e4"},
     {file = "PyYAML-6.0.1-cp312-cp312-win32.whl", hash = "sha256:d483d2cdf104e7c9fa60c544d92981f12ad66a457afae824d146093b8c294c54"},
@@ -1732,13 +1733,13 @@ testing = ["build[virtualenv] (>=1.0.3)", "covdefaults (>=2.3)", "detect-test-po
 
 [[package]]
 name = "typing-extensions"
-version = "4.10.0"
+version = "4.11.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "typing_extensions-4.10.0-py3-none-any.whl", hash = "sha256:69b1a937c3a517342112fb4c6df7e72fc39a38e7891a5730ed4985b5214b5475"},
-    {file = "typing_extensions-4.10.0.tar.gz", hash = "sha256:b0abd7c89e8fb96f98db18d86106ff1d90ab692004eb746cf6eda2682f91b3cb"},
+    {file = "typing_extensions-4.11.0-py3-none-any.whl", hash = "sha256:c1f94d72897edaf4ce775bb7558d5b79d8126906a14ea5ed1635921406c0387a"},
+    {file = "typing_extensions-4.11.0.tar.gz", hash = "sha256:83f085bd5ca59c80295fc2a82ab5dac679cbe02b9f33f7d83af68e241bea51b0"},
 ]
 
 [[package]]
diff --git a/tox.ini b/tox.ini
index 095d5da..19bd8de 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ allowlist_externals =
     mkdir
     poetry
 commands =
-    poetry install
+    poetry install --sync
     mkdir -p ./tmp
     poetry run pytest -svv --cov=bento_wes --cov-branch {posargs}
     poetry run flake8 ./bento_wes ./tests