# Base library

# Base Library Update

In order to avoid the unknown impact of the new version of the basic library on the online mini program, WeChat clients are all carrying The previous stable version. The base library is published.

After the release of the new version of the client, and then through the background grayscale new version of the base library, grayscale duration is generally 12 24 Hours, the new version of the base library will not be available on the user's device until grayscale ends.

By WeChat 6.5.8 For example, the client at the time of publishing is carrying 1.1.1 Base Library (6.5.7 Has been a full amount of stable version) released on the 6.5.8 After the release, we will go through the background grayscale 1.2.0 Base library.

View Base Library Version Distribution

# The relationship between the base library and the client

The ability of Mini programs requires WeChat client to support, each basic library can only run on the corresponding client version, the high version of the basic library can not be compatible with the low version of WeChat client. Usually:

• No. 1 (major), 2 (minor) version number updates usually need to rely on the new version of the client, such as: base library v2.1.3 Running on the v6.6.7 Client, Base Library v2.2.0 Need v6.7.0 Client.
• No. 3（patch） Bit version number updates generally do not need to rely on client updates, such as: base library v2.1.0 v2.1.3 Are running on the v6.6.7 Client, the new release will overwrite the old version.

For a compatible approach to the base library, you can check outCompatible processingChapter.