diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9e47033e..7f47e12a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,16 +38,16 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.11"]
+        python-version: ["3.8", "3.12"]
         include:
           - os: windows-latest
-            python-version: "3.9"
+            python-version: "3.11"
           - os: ubuntu-latest
-            python-version: "pypy-3.8"
+            python-version: "pypy-3.9"
           - os: ubuntu-latest
             python-version: "3.10"
           - os: macos-latest
-            python-version: "3.8"
+            python-version: "3.9"
     steps:
       - uses: actions/checkout@v4
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
diff --git a/pyproject.toml b/pyproject.toml
index 34c25101..e716c121 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,11 +16,7 @@ classifiers = [
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3"
 ]
 requires-python = ">=3.8"
 dependencies = [
@@ -143,6 +139,9 @@ timeout_method = "thread"
 filterwarnings= [
   # Fail on warnings
   "error",
+  # from python-dateutil
+  "ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning",
+  "ignore:datetime.datetime.utcnow:DeprecationWarning",
 ]
 
 [tool.coverage.report]