diff --git a/.github/workflows/pr_check.yml b/.github/workflows/pr_check.yml
index 464baa97..ed783140 100644
--- a/.github/workflows/pr_check.yml
+++ b/.github/workflows/pr_check.yml
@@ -12,14 +12,14 @@ jobs:
     uses: ./.github/workflows/tests.yml
     with:
       neovim_versions: |
-        [ "nightly", "v0.9.4" ]
+        [ "nightly", "v0.10.0" ]
 
   lua-language-server:
     uses: ./.github/workflows/lua_language_server.yml
     with:
-      lua_ls_version: 3.7.0
+      lua_ls_version: 3.9.1
       neovim_versions: |
-        [ "nightly", "v0.9.4" ]
+        [ "nightly", "v0.10.0" ]
 
   stylua:
     name: stylua
diff --git a/lua/ibl/highlights.lua b/lua/ibl/highlights.lua
index 53e5a529..c3425148 100644
--- a/lua/ibl/highlights.lua
+++ b/lua/ibl/highlights.lua
@@ -17,13 +17,7 @@ local M = {
 
 ---@param name string
 local get = function(name)
-    -- TODO [Lukas]: remove this when AstroNvim drops support for 0.8
-    if not vim.api.nvim_get_hl then
-        ---@diagnostic disable-next-line
-        return (vim.fn.hlexists(name) == 1 and vim.api.nvim_get_hl_by_name(name, true)) or vim.empty_dict() --[[@as table]]
-    end
-
-    return vim.api.nvim_get_hl(0, { name = name })
+    return vim.api.nvim_get_hl(0, { name = name }) --[[@as vim.api.keyset.highlight]]
 end
 
 ---@param hl table
diff --git a/lua/ibl/init.lua b/lua/ibl/init.lua
index d83d3125..52632b33 100644
--- a/lua/ibl/init.lua
+++ b/lua/ibl/init.lua
@@ -12,7 +12,6 @@ local namespace = vim.api.nvim_create_namespace "indent_blankline"
 
 local M = {}
 
----@package
 M.initialized = false
 
 ---@type table<number, { scope: TSNode?, left_offset: number, top_offset: number, tick: number }>
diff --git a/lua/ibl/scope.lua b/lua/ibl/scope.lua
index 3380cdd7..379dcd59 100644
--- a/lua/ibl/scope.lua
+++ b/lua/ibl/scope.lua
@@ -12,7 +12,7 @@ end
 
 --- Takes a language tree and a range, and returns the child language tree for that range
 ---
----@param language_tree LanguageTree
+---@param language_tree vim.treesitter.LanguageTree
 ---@param range table<number, number>
 ---@param config ibl.config.full
 M.language_for_range = function(language_tree, range, config)
diff --git a/lua/ibl/utils.lua b/lua/ibl/utils.lua
index dc52a989..a76c775c 100644
--- a/lua/ibl/utils.lua
+++ b/lua/ibl/utils.lua
@@ -247,6 +247,7 @@ end
 ---@return ibl.listchars
 M.get_listchars = function(bufnr)
     local listchars
+    ---@diagnostic disable-next-line
     local list = vim.opt.list:get()
     if list then
         listchars = vim.opt.listchars:get()
@@ -424,11 +425,7 @@ end
 ---@vararg T
 ---@return T
 M.tbl_join = function(...)
-    local result = {}
-    for i, v in ipairs(vim.tbl_flatten { ... }) do
-        result[i] = v
-    end
-    return result
+    return vim.iter({ ... }):flatten():totable()
 end
 
 ---@generic T