diff --git a/.kokoro/presubmit/presubmit.cfg b/.kokoro/presubmit/presubmit.cfg
index 46866717fc..56025cb2e0 100644
--- a/.kokoro/presubmit/presubmit.cfg
+++ b/.kokoro/presubmit/presubmit.cfg
@@ -5,7 +5,7 @@
 # Other Python version unit tests are run separately
 env_vars: {
     key: "NOX_SESSION"
-    value: "unit-3.9 lint lint_setup_py blacken cover"
+    value: "unit-3.12 lint lint_setup_py blacken cover"
 }
 
 # Run unit tests in parallel, splitting up by file
diff --git a/.kokoro/presubmit/release.cfg b/.kokoro/presubmit/release.cfg
index bb84c062a9..a53b631c60 100644
--- a/.kokoro/presubmit/release.cfg
+++ b/.kokoro/presubmit/release.cfg
@@ -3,7 +3,7 @@
 # Run system tests in presubmit for library releases
 env_vars: {
     key: "NOX_SESSION"
-    value: "system-3.9 unit"
+    value: "system-3.10 unit"
 }
 
 # Run system tests in parallel, splitting up by file
diff --git a/.kokoro/presubmit/unit_3-9.cfg b/.kokoro/presubmit/unit_3-9.cfg
index e97dc78539..ce56c17064 100644
--- a/.kokoro/presubmit/unit_3-9.cfg
+++ b/.kokoro/presubmit/unit_3-9.cfg
@@ -3,7 +3,7 @@
 # Run unit tests for Python 3.9
 env_vars: {
     key: "NOX_SESSION"
-    value: "unit-3.9"
+    value: "unit-3.12"
 }
 
 # Run unit tests in parallel, splitting up by file
diff --git a/.kokoro/presubmit/unit_langchain_py39.cfg b/.kokoro/presubmit/unit_langchain_py39.cfg
index 5b3c7bb9bf..2a88661314 100644
--- a/.kokoro/presubmit/unit_langchain_py39.cfg
+++ b/.kokoro/presubmit/unit_langchain_py39.cfg
@@ -3,7 +3,7 @@
 # Run unit tests for LangChain on Python 3.9
 env_vars: {
     key: "NOX_SESSION"
-    value: "unit_langchain-3.9"
+    value: "unit_langchain-3.11"
 }
 
 # Run unit tests in parallel, splitting up by file