diff --git a/.stylua.toml b/.stylua.toml
index 07d4ab4..c555248 100644
--- a/.stylua.toml
+++ b/.stylua.toml
@@ -1,3 +1,4 @@
+syntax = 'Lua52'
 column_width = 100
 line_endings = 'Unix'
 indent_type = 'Spaces'
diff --git a/lua/outline/float.lua b/lua/outline/float.lua
index 839e013..7273a47 100644
--- a/lua/outline/float.lua
+++ b/lua/outline/float.lua
@@ -69,7 +69,13 @@ function Float:open(lines, hl, title, indent)
     self.ns = vim.api.nvim_create_namespace('OutlineHelp')
     for _, h in ipairs(hl) do
       if _G._outline_nvim_has[11] then
-        vim.hl.range(self.bufnr, self.ns, h.name, { h.line, h.from + indent }, { h.line, (h.to ~= -1 and h.to + indent) or -1 })
+        vim.hl.range(
+          self.bufnr,
+          self.ns,
+          h.name,
+          { h.line, h.from + indent },
+          { h.line, (h.to ~= -1 and h.to + indent) or -1 }
+        )
       else
         ---@diagnostic disable-next-line:deprecated
         vim.api.nvim_buf_add_highlight(
diff --git a/lua/outline/highlight.lua b/lua/outline/highlight.lua
index 4f80cc3..dc8065c 100644
--- a/lua/outline/highlight.lua
+++ b/lua/outline/highlight.lua
@@ -10,7 +10,9 @@ local M = {
 ---@param bufnr integer
 function M.clear_all_ns(bufnr)
   if vim.api.nvim_buf_is_valid(bufnr) then
-    pcall(function() vim.api.nvim_buf_clear_namespace(bufnr, -1, 0, -1) end)
+    pcall(function()
+      vim.api.nvim_buf_clear_namespace(bufnr, -1, 0, -1)
+    end)
   end
 end
 
diff --git a/lua/outline/providers/markdown.lua b/lua/outline/providers/markdown.lua
index 827b9d2..ccbf7a6 100644
--- a/lua/outline/providers/markdown.lua
+++ b/lua/outline/providers/markdown.lua
@@ -27,7 +27,7 @@ function M.supports_buffer(bufnr, config)
       end
     end
   end
-  return ft == "markdown"
+  return ft == 'markdown'
 end
 
 -- Parses markdown files and returns a table of SymbolInformation[] which is
@@ -47,8 +47,8 @@ function M.handle_markdown()
       goto nextline
     end
 
-    local next_value = lines[line+1]
-    local is_emtpy_line = #value:gsub("^%s*(.-)%s*$", "%1") == 0
+    local next_value = lines[line + 1]
+    local is_emtpy_line = #value:gsub('^%s*(.-)%s*$', '%1') == 0
 
     local header, title = string.match(value, '^(#+)%s+(.+)$')
     if not header and next_value and not is_emtpy_line then
diff --git a/lua/outline/providers/nvim-lsp.lua b/lua/outline/providers/nvim-lsp.lua
index e2ef201..40e94da 100644
--- a/lua/outline/providers/nvim-lsp.lua
+++ b/lua/outline/providers/nvim-lsp.lua
@@ -161,10 +161,12 @@ local function legacy_rename(sidebar, client, node)
   }
   local status, err
   if _G._outline_nvim_has[11] then
-    status, err = client:request_sync('textDocument/rename', params, request_timeout, sidebar.code.buf)
+    status, err =
+      client:request_sync('textDocument/rename', params, request_timeout, sidebar.code.buf)
   else
     ---@diagnostic disable-next-line
-    status, err = client.request_sync('textDocument/rename', params, request_timeout, sidebar.code.buf)
+    status, err =
+      client.request_sync('textDocument/rename', params, request_timeout, sidebar.code.buf)
   end
   if status == nil or status.err or err or status.result == nil then
     return false
@@ -236,7 +238,7 @@ function M.show_hover(sidebar)
 
   local md_lines = l.util.convert_input_to_markdown_lines(status.result.contents)
   if _G._outline_nvim_has[10] then
-    md_lines = vim.split(status.result.contents, '\n', { trimempty = true });
+    md_lines = vim.split(status.result.contents, '\n', { trimempty = true })
   else
     ---@diagnostic disable-next-line:deprecated
     md_lines = l.util.trim_empty_lines(md_lines)
diff --git a/lua/outline/sidebar.lua b/lua/outline/sidebar.lua
index 9e0df27..888f7d3 100644
--- a/lua/outline/sidebar.lua
+++ b/lua/outline/sidebar.lua
@@ -344,8 +344,8 @@ function Sidebar:__refresh()
   if focused_outline or not self.view:is_open() then
     return
   end
-  local ft = vim.api.nvim_get_option_value("ft", { buf = buf })
-  local listed = vim.api.nvim_get_option_value("ft", { buf = buf })
+  local ft = vim.api.nvim_get_option_value('ft', { buf = buf })
+  local listed = vim.api.nvim_get_option_value('ft', { buf = buf })
   if ft == 'OutlineHelp' or not (listed or ft == 'help') then
     return
   end
diff --git a/lua/outline/utils/init.lua b/lua/outline/utils/init.lua
index 4541185..75346f7 100644
--- a/lua/outline/utils/init.lua
+++ b/lua/outline/utils/init.lua
@@ -40,8 +40,8 @@ function M.flash_highlight(winnr, lnum, durationMs, hl_group)
   local bufnr = vim.api.nvim_win_get_buf(winnr)
   local ns
   if _G._outline_nvim_has[11] then
-    ns = vim.api.nvim_create_namespace("_outline_nvim_flash")
-    vim.hl.range(bufnr, ns, hl_group, { lnum-1, 0 }, { lnum-1, -1 })
+    ns = vim.api.nvim_create_namespace('_outline_nvim_flash')
+    vim.hl.range(bufnr, ns, hl_group, { lnum - 1, 0 }, { lnum - 1, -1 })
   else
     ---@diagnostic disable-next-line:deprecated
     ns = vim.api.nvim_buf_add_highlight(bufnr, 0, hl_group, lnum - 1, 0, -1)