diff --git a/src/oss/deepagents/sandboxes.mdx b/src/oss/deepagents/sandboxes.mdx
index 1ff8d10684..bd9d731877 100644
--- a/src/oss/deepagents/sandboxes.mdx
+++ b/src/oss/deepagents/sandboxes.mdx
@@ -452,7 +452,7 @@ You can also call the backend `execute()` method directly in your application co
 
         from langchain_vercel_sandbox import VercelSandbox
 
-        sandbox = Sandbox.create()
+        sandbox = Sandbox.create(runtime="python3.13")
         backend = VercelSandbox(sandbox=sandbox)
 
         try:
@@ -705,7 +705,7 @@ Use `upload_files()` to populate the sandbox before the agent runs. Paths must b
 
         from langchain_vercel_sandbox import VercelSandbox
 
-        sandbox = Sandbox.create()
+        sandbox = Sandbox.create(runtime="python3.13")
         backend = VercelSandbox(sandbox=sandbox)
 
         backend.upload_files(
@@ -877,7 +877,7 @@ Use `download_files()` to retrieve files from the sandbox after the agent finish
 
         from langchain_vercel_sandbox import VercelSandbox
 
-        sandbox = Sandbox.create()
+        sandbox = Sandbox.create(runtime="python3.13")
         backend = VercelSandbox(sandbox=sandbox)
 
         results = backend.download_files(["/src/index.py", "/output.txt"])
diff --git a/src/oss/python/integrations/sandboxes/vercel.mdx b/src/oss/python/integrations/sandboxes/vercel.mdx
index c7161b4302..1503a56d89 100644
--- a/src/oss/python/integrations/sandboxes/vercel.mdx
+++ b/src/oss/python/integrations/sandboxes/vercel.mdx
@@ -36,7 +36,7 @@ from vercel.sandbox import Sandbox
 
 from langchain_vercel_sandbox import VercelSandbox
 
-sandbox = Sandbox.create()
+sandbox = Sandbox.create(runtime="python3.13")
 backend = VercelSandbox(sandbox=sandbox)
 
 try:
@@ -55,7 +55,7 @@ from langchain_anthropic import ChatAnthropic
 from deepagents import create_deep_agent
 from langchain_vercel_sandbox import VercelSandbox
 
-sandbox = Sandbox.create()
+sandbox = Sandbox.create(runtime="python3.13")
 backend = VercelSandbox(sandbox=sandbox)
 
 agent = create_deep_agent(
diff --git a/src/snippets/deepagents-sandbox-basic-py.mdx b/src/snippets/deepagents-sandbox-basic-py.mdx
index b9d83d7728..f280678701 100644
--- a/src/snippets/deepagents-sandbox-basic-py.mdx
+++ b/src/snippets/deepagents-sandbox-basic-py.mdx
@@ -237,7 +237,7 @@
         from langchain_vercel_sandbox import VercelSandbox
         from vercel.sandbox import Sandbox
 
-        sandbox = Sandbox.create()
+        sandbox = Sandbox.create(runtime="python3.13")
         backend = VercelSandbox(sandbox=sandbox)
 
         agent = create_deep_agent(
diff --git a/src/snippets/sandboxes-basic-tabs-py.mdx b/src/snippets/sandboxes-basic-tabs-py.mdx
index 449810d94c..ecd6eeac27 100644
--- a/src/snippets/sandboxes-basic-tabs-py.mdx
+++ b/src/snippets/sandboxes-basic-tabs-py.mdx
@@ -183,7 +183,7 @@ import DeepagentsSandboxBasicDaytonaPy from '/snippets/code-samples/deepagents-s
         from langchain_vercel_sandbox import VercelSandbox
         from vercel.sandbox import Sandbox
 
-        sandbox = Sandbox.create()
+        sandbox = Sandbox.create(runtime="python3.13")
         backend = VercelSandbox(sandbox=sandbox)
 
         agent = create_deep_agent(