diff --git a/jupyter_server/services/kernels/handlers.py b/jupyter_server/services/kernels/handlers.py
index 0ebebf4a51..f312a84768 100644
--- a/jupyter_server/services/kernels/handlers.py
+++ b/jupyter_server/services/kernels/handlers.py
@@ -94,9 +94,9 @@ async def post(self, kernel_id, action):
         if action == "interrupt":
             await ensure_async(km.interrupt_kernel(kernel_id))
             self.set_status(204)
-        if action == "restart":
+        if action == "restart" or action == "restart-in-place":
             try:
-                await km.restart_kernel(kernel_id)
+                await km.restart_kernel(kernel_id, restart_in_place=action == "restart-in-place")
             except Exception as e:
                 message = "Exception restarting kernel"
                 self.log.error(message, exc_info=True)
@@ -113,7 +113,7 @@ async def post(self, kernel_id, action):
 # URL to handler mappings
 # -----------------------------------------------------------------------------
 _kernel_id_regex = r"(?P<kernel_id>\w+-\w+-\w+-\w+-\w+)"
-_kernel_action_regex = r"(?P<action>restart|interrupt)"
+_kernel_action_regex = r"(?P<action>restart|interrupt|restart-in-place)"
 
 default_handlers = [
     (r"/api/kernels", MainKernelHandler),
diff --git a/jupyter_server/services/kernels/kernelmanager.py b/jupyter_server/services/kernels/kernelmanager.py
index f45fdff193..1fd5a22998 100644
--- a/jupyter_server/services/kernels/kernelmanager.py
+++ b/jupyter_server/services/kernels/kernelmanager.py
@@ -434,10 +434,12 @@ async def _async_shutdown_kernel(self, kernel_id, now=False, restart=False):
 
     shutdown_kernel = _async_shutdown_kernel
 
-    async def _async_restart_kernel(self, kernel_id, now=False):
+    async def _async_restart_kernel(self, kernel_id, now=False, restart_in_place=False):
         """Restart a kernel by kernel_id"""
         self._check_kernel_id(kernel_id)
-        await self.pinned_superclass._async_restart_kernel(self, kernel_id, now=now)
+        await self.pinned_superclass._async_restart_kernel(
+            self, kernel_id, now=now, restart_in_place=restart_in_place
+        )
         kernel = self.get_kernel(kernel_id)
         # return a Future that will resolve when the kernel has successfully restarted
         channel = kernel.connect_shell()