diff --git a/.gitignore b/.gitignore
index 0e07c25f..803b58be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,4 @@ docker/
 TAGS
 .vscode/
 test/data/ssl/*.pem
+/rebar.lock
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca389051..de7f7056 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+- 4.1.1
+  - Upgrade `kafka_protocol` from version 4.1.5 to 4.1.9.
+
 - 4.1.0
   - For v2 subscribers, pass offset `ack_fun` as a callback state init parameter.
     This makes it possible for callback implementation to acknowledge offsets easier.
diff --git a/rebar.config b/rebar.config
index a13b3698..9b828b7d 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,4 +1,4 @@
-{deps, [{kafka_protocol, "4.1.5"}]}.
+{deps, [{kafka_protocol, "4.1.9"}]}.
 {project_plugins, [{rebar3_lint, "~> 3.2.5"}]}.
 {edoc_opts, [{preprocess, true}, {macros, [{build_brod_cli, true}]}]}.
 {erl_opts, [warnings_as_errors, warn_unused_vars,warn_shadow_vars,warn_obsolete_guard,debug_info]}.
diff --git a/rebar.lock b/rebar.lock
deleted file mode 100644
index 1a164513..00000000
--- a/rebar.lock
+++ /dev/null
@@ -1,11 +0,0 @@
-{"1.2.0",
-[{<<"crc32cer">>,{pkg,<<"crc32cer">>,<<"0.1.8">>},1},
- {<<"kafka_protocol">>,{pkg,<<"kafka_protocol">>,<<"4.1.5">>},0}]}.
-[
-{pkg_hash,[
- {<<"crc32cer">>, <<"C6C2275C5FB60A95F4935D414F30B50EE9CFED494081C9B36EBB02EDFC2F48DB">>},
- {<<"kafka_protocol">>, <<"D15E64994A8CA99716AB47DB4132614359AC1BFA56D6C5B4341FDC1AA4041518">>}]},
-{pkg_hash_ext,[
- {<<"crc32cer">>, <<"251499085482920DEB6C9B7AADABF9FB4C432F96ADD97AB42AEE4501E5B6F591">>},
- {<<"kafka_protocol">>, <<"C956C9357FEF493B7072A35D0C3E2BE02AA5186C804A412D29E62423BB15E5D9">>}]}
-].