diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 600b14b..f8087b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
 
       - name: luacheck
         uses: lunarmodules/luacheck@v1
@@ -14,11 +14,14 @@ jobs:
   tests:
     strategy:
       matrix:
-        lua-version: ["5.1.5", "5.2.4", "5.3.6", "5.4.4"]
+        lua-version: ["5.1.5", "5.2.4", "5.3.6", "5.4.8"]
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
+
+      - name: install readline
+        run: sudo apt-get install -y libreadline-dev
 
       - name: localua
         run: |
diff --git a/LICENSE.txt b/LICENSE.txt
index 084dd91..e61f237 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,5 +1,5 @@
 Copyright (C) 2012-2013 by Moodstocks SAS
-Copyright (C) 2014-2022 by Pierre Chapuis
+Copyright (C) since 2014 by Pierre Chapuis
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 330449e..ab3ef59 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,15 @@ rq.url = "http://httpbin.org/post"
 local b, c, h = http.request(rq)
 ```
 
+Example setting extra headers (here Authorization):
+
+```lua
+local rq = mp.gen_request({myfile = {name = "myfilename", data = "some data"}})
+rq.url = "http://httpbin.org/post"
+rq.headers.Authorization = "Bearer SomeToken42"
+local b, c, h = http.request(rq)
+```
+
 ## Bugs
 
 Non-ASCII part names are not supported.
@@ -91,5 +100,5 @@ Note that non-ASCII file names are supported since version 1.2.
 
 ## Copyright
 
-- Copyright (c) 2012-2013 Moodstocks SAS
-- Copyright (c) 2014-2022 Pierre Chapuis
+- Copyright (c) 2012 - 2013 Moodstocks SAS
+- Copyright (c) since 2014 Pierre Chapuis
diff --git a/multipart-post.test.lua b/multipart-post.test.lua
index cebaf94..a6092ac 100644
--- a/multipart-post.test.lua
+++ b/multipart-post.test.lua
@@ -7,7 +7,7 @@ local enc = (require "multipart-post").encode
 local J
 do -- Find a JSON parser
     local ok, json = pcall(require, "cjson")
-    if not ok then ok, json = pcall(require, "json") end
+    if not ok then ok, json = pcall(require, "lunajson") end
     J = json.decode
     assert(ok and J, "no JSON parser found :(")
 end
@@ -33,6 +33,7 @@ T:start("gen_request"); do
         },
         foo = "bar",
     }
+    rq.headers.Authorization = "Bearer SomeToken42"
 
     rq.url = "http://httpbin.org/post"
     rq.sink = ltn12.sink.table(r)
@@ -47,6 +48,7 @@ T:start("gen_request"); do
         ltn12file="ltn12 data"
     })
     T:eq(r.form, {foo = "bar"})
+    T:eq(r.headers.Authorization, "Bearer SomeToken42")
 end; T:done()
 
 T:start("encode"); do
diff --git a/rockspec/multipart-post-scm-1.rockspec b/rockspec/multipart-post-scm-1.rockspec
index 8566ea1..9cfb901 100644
--- a/rockspec/multipart-post-scm-1.rockspec
+++ b/rockspec/multipart-post-scm-1.rockspec
@@ -29,7 +29,7 @@ build = {
 
 test_dependencies = {
     "cwtest",
-    "luajson",
+    "lunajson",
 }
 
 test = {