diff --git a/ibis/config.py b/ibis/config.py
diff --git a/ibis/expr/timecontext.py b/ibis/expr/timecontext.py
@@ -48,7 +48,9 @@
 # In order to use time context feature, there must be a column of Timestamp
 # type, and named as 'time' in TableExpr. This TIME_COL constant will be
 # used in filtering data from a table or columns of a table. It can be changed
-# by ibis.set_option('time_col')
+# by running:
+#
+# ibis.config.options.context_adjustment.time_col = "other_time_col"
 
 
 def get_time_col():

diff --git a/ibis/tests/test_api.py b/ibis/tests/test_api.py
@@ -61,13 +61,3 @@ class Distribution(NamedTuple):
     msg = r"\d+ packages found for backend 'foo'"
     with pytest.raises(RuntimeError, match=msg):
         ibis.foo
-
-
-@pytest.mark.parametrize(
-    ('key', 'value'), [("two.levels", True), ("gt.two.levels", 55)]
-)
-def test_getting_setting_config_options(key, value):
-    ibis.config.register_option(key, "DEFAULT")
-    assert ibis.config.get_option(key) == "DEFAULT"
-    ibis.config.set_option(key, value)
-    assert ibis.config.get_option(key) == value
diff --git a/poetry.lock b/poetry.lock
diff --git a/pyproject.toml b/pyproject.toml
@@ -28,6 +28,7 @@ multipledispatch = ">=0.6,<0.7"
 numpy = ">=1,<2"
 pandas = ">=1.2.5,<2"
 parsy = ">=1.3.0,<2"
+pydantic = ">=1.9.0,<2"
 regex = ">=2021.7.6"
 toolz = ">=0.11,<0.12"
 typing-extensions = { version = "^4.0.1", python = "<3.8" }

diff --git a/setup.py b/setup.py