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When I run an experimental syntax I get the following

Error response from daemon: Dockerfile parse error line 13: Unknown flag: security

When I run with DOCKER_BUILDKIT=1 I get,

I get,

[+] Building 0.0s (2/2) FINISHED                                                                                                                                              
 => [internal] load build definition from Dockerfile                                                                                                                     0.0s
 => => transferring dockerfile: 38B                                                                                                                                      0.0s
 => [internal] load .dockerignore                                                                                                                                        0.0s
 => => transferring context: 2B                                                                                                                                          0.0s
failed to solve with frontend dockerfile.v0: failed to create LLB definition: Dockerfile parse error line 13: Unknown flag: security

My version of Docker is from the Debian repo. How can I find what experimental syntaxes are supported?

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