Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• zsh/Dockerfile

We recommend upgrading to ubuntu:21.04, as this image has only 11 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	300	NULL Pointer Dereference SNYK-UBUNTU2104-KRB5-1533541	No Known Exploit
	300	NULL Pointer Dereference SNYK-UBUNTU2104-KRB5-1533541	No Known Exploit
	300	NULL Pointer Dereference SNYK-UBUNTU2104-KRB5-1533541	No Known Exploit
	364	Information Exposure SNYK-UBUNTU2104-LIBGCRYPT20-1297922	No Known Exploit
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-UBUNTU2104-LIBGCRYPT20-1583853	No Known Exploit

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