diff --git a/noxfile.py b/noxfile.py
index 0648d04..22877d5 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -200,19 +200,12 @@ def install_unittest_dependencies(session, *constraints):
     "protobuf_implementation",
     ["python", "upb", "cpp"],
 )
-@nox.parametrize(
-    "install_bigframes",
-    [True, False],
-)
-def unit(session, protobuf_implementation, install_bigframes):
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
     if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
-    if install_bigframes and session.python in ("3.7", "3.8"):
-        session.skip("Bigframes only supports Python 3.9+")
-
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
@@ -224,9 +217,6 @@ def unit(session, protobuf_implementation, install_bigframes):
     if protobuf_implementation == "cpp":
         session.install("protobuf<4")
 
-    if install_bigframes:
-        session.install("bigframes >= 1.17.0")
-
     # Run py.test against the unit tests.
     session.run(
         "py.test",
diff --git a/owlbot.py b/owlbot.py
index a75cbdd..ee6146c 100644
--- a/owlbot.py
+++ b/owlbot.py
@@ -28,19 +28,20 @@
 # Add templated files
 # ----------------------------------------------------------------------------
 
-extras = ["bqstorage"]
+extras_storage = ["bqstorage"]
+extras_bf = ["bqstorage", "bigframes"]
 extras_by_python = {
-    "3.7": extras,
-    "3.8": extras,
-    "3.9": extras,
-    "3.10": extras,
+    "3.7": extras_storage,
+    "3.8": extras_storage,
+    "3.9": extras_bf,
+    "3.10": extras_bf,
     # Use a middle version of Python to test when no extras are installed.
     "3.11": [],
-    "3.12": extras,
+    "3.12": extras_bf,
 }
 templated_files = common.py_library(
-    unit_test_python_versions=["3.7", "3.8", "3.11", "3.12"],
-    system_test_python_versions=["3.8", "3.11", "3.12"],
+    unit_test_python_versions=["3.7", "3.8", "3.9", "3.11", "3.12"],
+    system_test_python_versions=["3.8", "3.9", "3.11", "3.12"],
     cov_level=100,
     unit_test_extras_by_python=extras_by_python,
     unit_test_external_dependencies=["google-cloud-testutils"],
@@ -56,7 +57,6 @@
         # Multi-processing note isn't relevant, as bigquery-magics is responsible for
         # creating clients, not the end user.
         "docs/multiprocessing.rst",
-        "noxfile.py",
         "README.rst",
         ".github/workflows/unittest.yml",
     ],
diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
index 66cf6ee..653bc82 100644
--- a/testing/constraints-3.9.txt
+++ b/testing/constraints-3.9.txt
@@ -4,4 +4,5 @@
 # We try to test across major versions of our dependencies.
 # This is the last pandas 2.0.x release.
 pandas==2.0.3
+bigframes==1.17.0