---
title: "Edit a function"
description: "Change a Functions function's code, environment variables, or system configuration, and what Save does to its version."
content_type: "how-to"
product: "functions"
platform: "MyAccount"
url: "/myaccount/functions/how-to/edit-a-function/"
topic: ["edit"]
relationships: {"requires":["/myaccount/functions/how-to/create-a-function/"]}
---

# Edit a function

You can change a function after you create it: its code and requirements, its environment
variables, and its system configuration. Saving your changes rebuilds and redeploys the function.

## Before you begin

Open the function once it is **Running** or **Failed**. You can edit and save a failed function
like any other. A function's code, environment variables, and settings are read-only while it is
**Creating** or **Deploying**.

## Open the function

In **Compute > Functions**, under **Actions**, click the pencil icon for the function. You can
also click the function's name. The function's page opens with its code editor.

## Edit the code and environment

Edit the code and the requirements file in their tabs. You can also replace the code with a
fresh ZIP in the upload area above the editor. See
[Upload code as a ZIP](/myaccount/functions/how-to/upload-code-as-a-zip/).

Add or change **Environment variables** in **Function Configuration**. See
[Use environment variables](/myaccount/functions/how-to/use-environment-variables/) for the
naming rules.

## Edit the system configuration

Open the **System Configuration** tab. There you can change:

- **Memory**: 128, 256, 512, or 1024 MB.
- **Timeout (sec)**: the seconds a function can run, from 1 to 600.
- **Enable Dedicated Replica** and **Minimum Replica**, for CPU and container functions. See
  [Keep a function ready with dedicated replicas](/myaccount/functions/how-to/keep-a-function-ready-with-dedicated-replicas/).

The function's name, runtime, and hardware stay as you set them when you created it. To change
any of them, create a new function. See
[Create a function](/myaccount/functions/how-to/create-a-function/).

## Save the changes

Once you change the code, the environment variables, or the system configuration, the **Try**
button above the editor becomes **Save**. On a **Failed** function, **Save** is available once
you change something.

Click **Save**.

Saving rebuilds and redeploys the function. On the **Python 3.11 (Http)** sample, a saved edit
takes about 15 seconds to redeploy.

A new function's **Version** is 0, and the first saved edit makes it 1. Each later save raises it
by one.

## Check that the change applied

Select the function in the Functions list and open the **Info** tab below the list. Check that
**Version** went up by one. Call the function again to confirm the new behaviour. See
[Call a function](/myaccount/functions/how-to/call-a-function/).

If the function fails after an edit, check its logs. See
[View logs and monitoring](/myaccount/functions/how-to/view-logs-and-monitoring/) and
[Troubleshooting Functions](/myaccount/functions/troubleshooting/functions/).