diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index acd3e881d6..32dec287e7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,8 +30,8 @@ dependencies installed with `snowflake-connector-python` installed as an editabl
 Setting up a development environment is super easy with this [one simple tox command](https://tox.wiki/en/latest/example/devenv.html).
 
 ```shell
-tox --devenv venv37 -e py37
-. venv37/bin/activate
+tox --devenv venv39 -e py39
+. venv39/bin/activate
 ```
 
 Note: we suggest using the lowest supported Python version for development.
diff --git a/src/snowflake/connector/pandas_tools.py b/src/snowflake/connector/pandas_tools.py
index d89e48bcce..3e7ee9730b 100644
--- a/src/snowflake/connector/pandas_tools.py
+++ b/src/snowflake/connector/pandas_tools.py
@@ -398,7 +398,7 @@ def write_pandas(
     # use_logical_type should be True when dataframe contains datetimes with timezone.
     # https://github.com/snowflakedb/snowflake-connector-python/issues/1687
     if not use_logical_type and any(
-        [pandas.api.types.is_datetime64tz_dtype(df[c]) for c in df.columns]
+        [isinstance(df[c], pandas.DatetimeTZDtype) for c in df.columns]
     ):
         warnings.warn(
             "Dataframe contains a datetime with timezone column, but "
diff --git a/test/README.md b/test/README.md
index 280fd41d50..d01cc41dc3 100644
--- a/test/README.md
+++ b/test/README.md
@@ -21,7 +21,7 @@ We use `tox` version 4 to run test suites and other utilities.
 To run the most important tests, execute:
 
 ```shell
-tox -e "fix_lint,py37{,-pandas,-sso}"
+tox -e "fix_lint,py39{,-pandas,-sso}"
 ```
 
 **NOTE** Some integration tests may be sensitive to the cloud provider of the
@@ -37,10 +37,10 @@ is made.
 
 ### Running a single test
 
-Enter the tox environment you want (e.g. `py38`) and run `pytest` from there:
+Enter the tox environment you want (e.g. `py39`) and run `pytest` from there:
 
 ```shell
-. .tox/py38/bin/activate
+. .tox/py39/bin/activate
 pytest -v test/integ/test_connection.py::test_basic
 ```
 
@@ -55,7 +55,7 @@ either does the same as providing both of them.
 ## Test categories
 Chaining these categories is possible, but isn't encouraged.
 Note: running multiple categories in one `tox` run should be done like:
-`tox -e "fix_lint,py37-{,-sso},coverage"`
+`tox -e "fix_lint,py39-{,-sso},coverage"`
 
 * **pandas**: Tests specifically testing our optional dependency group "pandas".
 * **sso**: Tests specifically testing our optional dependency group "sso".
diff --git a/test/extras/README.md b/test/extras/README.md
index c8830c9c3b..2f3754e8d1 100644
--- a/test/extras/README.md
+++ b/test/extras/README.md
@@ -5,5 +5,5 @@
 These are tests that test weird edge cases when we need a standalone Python environment
 and process.
 
-Run only these tests with `tox`, for example: `tox -e py38-extras` from the
+Run only these tests with `tox`, for example: `tox -e py39-extras` from the
 top directory.