diff --git a/rebar.lock b/rebar.lock
index 2df3c3b..9bf9cc7 100644
--- a/rebar.lock
+++ b/rebar.lock
@@ -1,8 +1,8 @@
 {"1.2.0",
-[{<<"gpb">>,{pkg,<<"gpb">>,<<"4.21.0">>},0}]}.
+[{<<"gpb">>,{pkg,<<"gpb">>,<<"4.21.1">>},0}]}.
 [
 {pkg_hash,[
- {<<"gpb">>, <<"7A2EB8DD0F3032B7B46B04DCDB490FFABE43EAB3A9A1F905BD03C9EC35BABB0F">>}]},
+ {<<"gpb">>, <<"72E229C242D252D690ADDCFD04A6416C26C4D4D2C3521E05570A7A78B48D3BD1">>}]},
 {pkg_hash_ext,[
- {<<"gpb">>, <<"DA45984D26048D8D508D3BBFFA6F4A5A5163841CEFBF40809622BF92B4640DE4">>}]}
+ {<<"gpb">>, <<"C05C9AEA9E25BD341367A43B3D3EB68E951563911072259C5EC4CB6642F4EF22">>}]}
 ].