diff --git a/apps/readest.koplugin/main.lua b/apps/readest.koplugin/main.lua
index 83644ff7..ef352a4c 100644
--- a/apps/readest.koplugin/main.lua
+++ b/apps/readest.koplugin/main.lua
@@ -37,10 +37,22 @@ ReadestSync.default_settings = {
     last_sync_at = nil,
 }
 
+local UPDATE_URLS = {
+    "https://download.readest.com/releases/latest.json",
+    "https://github.com/readest/readest/releases/latest/download/latest.json",
+}
+local DOWNLOAD_URLS = {
+    "https://download.readest.com/releases/%s/Readest-%s-1.koplugin.zip",
+    "https://github.com/readest/readest/releases/download/%s/Readest-%s-1.koplugin.zip",
+}
+
 function ReadestSync:init()
     self.last_sync_timestamp = 0
     self.settings = G_reader_settings:readSetting("readest_sync", self.default_settings)
 
+    local meta = dofile(self.path .. "/_meta.lua")
+    self.installed_version = meta and meta.version and tostring(meta.version)
+
     self.ui.menu:registerToMainMenu(self)
 end
 
@@ -110,6 +122,18 @@ function ReadestSync:addToMainMenu(menu_items)
                 callback = function()
                     self:pullBookConfig(true)
                 end,
+                separator = true,
+            },
+            {
+                text_func = function()
+                    if self.installed_version then
+                        return T(_("Check for update (v%1)"), self.installed_version)
+                    end
+                    return _("Check for update")
+                end,
+                callback = function()
+                    self:checkForUpdate()
+                end,
             },
         }
     }
@@ -653,4 +677,169 @@ function ReadestSync:onCloseWidget()
     end
 end
 
+function ReadestSync:compareVersions(v1, v2)
+    local function parse(v)
+        local parts = {}
+        for num in tostring(v):gmatch("(%d+)") do
+            table.insert(parts, tonumber(num))
+        end
+        return parts
+    end
+    local p1, p2 = parse(v1), parse(v2)
+    local len = math.max(#p1, #p2)
+    for i = 1, len do
+        local a, b = p1[i] or 0, p2[i] or 0
+        if a < b then return -1 end
+        if a > b then return 1 end
+    end
+    return 0
+end
+
+function ReadestSync:fetchLatestVersion()
+    local http = require("socket.http")
+    local ltn12 = require("ltn12")
+    local socket = require("socket")
+    local socketutil = require("socketutil")
+    local json = require("json")
+
+    for _, url in ipairs(UPDATE_URLS) do
+        local sink = {}
+        socketutil:set_timeout(socketutil.LARGE_BLOCK_TIMEOUT, socketutil.LARGE_TOTAL_TIMEOUT)
+        local code = socket.skip(1, http.request{
+            url = url,
+            sink = ltn12.sink.table(sink),
+        })
+        socketutil:reset_timeout()
+
+        if code == 200 then
+            local ok, data = pcall(json.decode, table.concat(sink))
+            if ok and data and data.version then
+                return data.version
+            end
+        end
+        logger.dbg("ReadestSync: failed to fetch latest.json from", url, "code:", code)
+    end
+    return nil
+end
+
+function ReadestSync:checkForUpdate()
+    local ConfirmBox = require("ui/widget/confirmbox")
+
+    if NetworkMgr:willRerunWhenOnline(function() self:checkForUpdate() end) then
+        return
+    end
+
+    UIManager:show(InfoMessage:new{
+        text = _("Checking for update…"),
+        timeout = 1,
+    })
+
+    local current_version = self.installed_version
+
+    Device:setIgnoreInput(true)
+    local latest_version = self:fetchLatestVersion()
+    Device:setIgnoreInput(false)
+
+    if not latest_version then
+        UIManager:show(InfoMessage:new{
+            text = _("Failed to check for update. Please try again later."),
+            timeout = 3,
+        })
+        return
+    end
+
+    if not current_version or self:compareVersions(current_version, latest_version) < 0 then
+        UIManager:show(ConfirmBox:new{
+            text = current_version
+                and T(_("A new version is available: v%1 (current: v%2).\n\nDo you want to update now?"), latest_version, current_version)
+                or T(_("A new version is available: v%1.\n\nDo you want to update now?"), latest_version),
+            ok_text = _("Update"),
+            ok_callback = function()
+                self:downloadAndInstall(latest_version)
+            end,
+        })
+    else
+        UIManager:show(InfoMessage:new{
+            text = T(_("You are up to date (v%1)."), current_version),
+            timeout = 3,
+        })
+    end
+end
+
+function ReadestSync:downloadAndInstall(version)
+    local ConfirmBox = require("ui/widget/confirmbox")
+    local DataStorage = require("datastorage")
+    local http = require("socket.http")
+    local ltn12 = require("ltn12")
+    local socket = require("socket")
+    local socketutil = require("socketutil")
+
+    if NetworkMgr:willRerunWhenOnline(function() self:downloadAndInstall(version) end) then
+        return
+    end
+
+    local tag = "v" .. version
+    local zip_name = "Readest-" .. version .. "-1.koplugin.zip"
+    local tmp_path = DataStorage:getDataDir() .. "/" .. zip_name
+
+    UIManager:show(InfoMessage:new{
+        text = _("Downloading update…"),
+        timeout = 1,
+    })
+
+    Device:setIgnoreInput(true)
+
+    local download_ok = false
+    for _, url_template in ipairs(DOWNLOAD_URLS) do
+        local url = string.format(url_template, tag, version)
+        logger.dbg("ReadestSync: downloading from", url)
+
+        socketutil:set_timeout(socketutil.FILE_BLOCK_TIMEOUT, socketutil.FILE_TOTAL_TIMEOUT)
+        local code = socket.skip(1, http.request{
+            url = url,
+            sink = ltn12.sink.file(io.open(tmp_path, "w")),
+        })
+        socketutil:reset_timeout()
+
+        if code == 200 then
+            download_ok = true
+            break
+        end
+        logger.dbg("ReadestSync: download failed from", url, "code:", code)
+    end
+
+    Device:setIgnoreInput(false)
+
+    if not download_ok then
+        os.remove(tmp_path)
+        UIManager:show(InfoMessage:new{
+            text = _("Failed to download update. Please try again later."),
+            timeout = 3,
+        })
+        return
+    end
+
+    local plugin_dir = self.path
+    local parent_dir = plugin_dir:match("(.*/)")
+
+    local ok, err = Device:unpackArchive(tmp_path, parent_dir)
+    os.remove(tmp_path)
+
+    if ok then
+        UIManager:show(ConfirmBox:new{
+            text = T(_("Readest plugin updated to v%1.\n\nPlease restart KOReader to apply the update."), version),
+            ok_text = _("Restart now"),
+            ok_callback = function()
+                UIManager:restartKOReader()
+            end,
+            cancel_text = _("Later"),
+        })
+    else
+        UIManager:show(InfoMessage:new{
+            text = T(_("Failed to install update: %1"), err or _("unknown error")),
+            timeout = 5,
+        })
+    end
+end
+
 return ReadestSync
\ No newline at end of file