diff --git a/noxfile.py b/noxfile.py
index e41ee6c..6e3c1f3 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -72,7 +72,12 @@
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
 nox.options.sessions = [
-    "unit",
+    "unit-3.9",
+    "unit-3.10",
+    "unit-3.11",
+    "unit-3.12",
+    "unit-3.13",
+    "unit-3.14",
     "system",
     "cover",
     "lint",
@@ -176,6 +181,9 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if session.python in ("3.7", "3.8") and os.environ.get("TRAMPOLINE_IMAGE"):
+        session.skip("skipping Python 3.7 and 3.8 in kokoro tests")
+
     if protobuf_implementation == "cpp" and session.python in (
         "3.11",
         "3.12",