{"record":{"id":"41922bf1792edf4c","repo":"hashicorp/packer","slug":"unsupported-remote-protocol-minor-version-d-the","errorCode":null,"errorMessage":"unsupported remote protocol MINOR version %d. The supported MINOR protocol versions are version %d and below. Please upgrade Packer or use an older version of the plugin if possible","messagePattern":"unsupported remote protocol MINOR version (.+?)\\. The supported MINOR protocol versions are version (.+?) and below\\. Please upgrade Packer or use an older version of the plugin if possible","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packer/plugin-getter/plugins.go","lineNumber":540,"sourceCode":"\n\t\tlocalVersion, err = NewAPIVersion(fmt.Sprintf(\"x%s.%s\", binOpts.APIVersionMajor, binOpts.APIVersionMinor))\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"Failed to parse API Version from constraints: %s\", err)\n\t\t}\n\t}\n\n\tremoteVersion, err := NewAPIVersion(remoteProt)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif localVersion.Major != remoteVersion.Major {\n\t\treturn fmt.Errorf(\"unsupported remote protocol MAJOR version %d. The current MAJOR protocol version is %d.\"+\n\t\t\t\" This version of Packer can only communicate with plugins using that version\", remoteVersion.Major, localVersion.Major)\n\t}\n\n\tif remoteVersion.Minor > localVersion.Minor {\n\t\treturn fmt.Errorf(\"unsupported remote protocol MINOR version %d. The supported MINOR protocol versions are version %d and below. \"+\n\t\t\t\"Please upgrade Packer or use an older version of the plugin if possible\", remoteVersion.Minor, localVersion.Minor)\n\t}\n\n\treturn nil\n}\n\nfunc (gp *GetOptions) Version() string {\n\treturn \"v\" + gp.version.String()\n}\n\nfunc (gp *GetOptions) VersionString() string {\n\treturn gp.version.String()\n}\n\n// A Getter helps get the appropriate files to download a binary.\ntype Getter interface {\n\t// Get allows Packer to know more information about releases of a plugin in\n\t// order to decide which version to install. Get behaves similarly to an","sourceCodeStart":522,"sourceCodeEnd":558,"githubUrl":"https://github.com/hashicorp/packer/blob/eb36e3c3e48a036f3e8cc94087636ee72e1303c9/packer/plugin-getter/plugins.go#L522-L558","documentation":"Within a matching MAJOR protocol version, CheckProtocolVersion() still rejects plugins whose MINOR protocol version is NEWER than what this Packer supports — the plugin may use RPC features Packer's side doesn't implement. Older minor versions are accepted (forward compatibility only goes down).","triggerScenarios":"Calling CheckProtocolVersion with remoteProt parsing to Major equal but Minor greater than localVersion.Minor — e.g. a plugin built with SDK protocol x5.1 installed by a Packer that only knows x5.0.","commonSituations":"Running a newly released plugin with an outdated Packer binary; a plugin release shipped ahead of the corresponding Packer version; CI images with pinned old Packer installing latest plugins.","solutions":["Upgrade Packer to the latest version so its supported MINOR protocol version covers the plugin.","Downgrade the plugin to a release whose x{major}.{minor} is within your Packer's supported minor version.","Check the plugin's README/docs for the minimum Packer version and align your binary."],"exampleFix":"// upgrade the Packer binary\n$ packer --version   # old, supports x5.0\n$ # install latest packer, then retry: packer plugins install ...","handlingStrategy":"validation","validationCode":"local, _ := NewAPIVersion(fmt.Sprintf(\"x%s.%s\", pluginsdk.APIVersionMajor, pluginsdk.APIVersionMinor))\nremote, err := NewAPIVersion(entry.ProtVersion)\nif err == nil && remote.Minor > local.Minor {\n\treturn fmt.Errorf(\"plugin needs newer packer (protocol x%d.%d > x%d.%d)\", remote.Major, remote.Minor, local.Major, local.Minor)\n}","typeGuard":null,"tryCatchPattern":"if err := binOpts.CheckProtocolVersion(entry.ProtVersion); err != nil {\n\tif strings.Contains(err.Error(), \"MINOR version\") {\n\t\treturn fmt.Errorf(\"upgrade packer or pin an older plugin release: %w\", err)\n\t}\n}","preventionTips":["Keep Packer binaries current, especially in CI images","Check each plugin's minimum-Packer requirement before pinning latest","Pin plugin versions in CI to avoid surprise protocol bumps"],"tags":["plugin-getter","protocol-version","incompatible-version","upgrade"],"backgroundTag":"protocol-minor-version-too-new","analyzedSha":"eb36e3c3e48a036f3e8cc94087636ee72e1303c9","analyzedAt":"2026-09-05T13:20:43.127Z","contentChangedAt":"2026-09-05T13:20:43.127Z","schemaVersion":2},"datasetVersion":"2026-09-12T17:17:11.597Z"}