diff --git a/NEWS.md b/NEWS.md
index 4b7a7d37..087c4f51 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,10 @@
 # NEWS
 
+1.20.1 - 2013-10-11
+-------------------
+
+- fix multipart: handle case where Length is undefined
+
 1.20.0 - 2023-10-10
 -------------------
 
diff --git a/README.md b/README.md
index 27d3a856..4b5c636e 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 Copyright (c) 2012-2023 Benoît Chesneau.
 
-__Version:__ 1.20.0
+__Version:__ 1.20.1
 
 # hackney
 
diff --git a/doc/README.md b/doc/README.md
index 17d75d84..bdac73ea 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -4,7 +4,7 @@
 
 Copyright (c) 2012-2023 Benoît Chesneau.
 
-__Version:__ 1.20.0
+__Version:__ 1.20.1
 
 # hackney
 
diff --git a/doc/overview.edoc b/doc/overview.edoc
index 391ec8d3..a5bb4044 100644
--- a/doc/overview.edoc
+++ b/doc/overview.edoc
@@ -17,7 +17,7 @@
 
 
 @copyright 2012-2023 Benoît Chesneau.
-@version 1.20.0
+@version 1.20.1
 @title hackney - HTTP client library in Erlang
 
 @doc
diff --git a/src/hackney.app.src b/src/hackney.app.src
index 4c75bd57..9e6d11ad 100644
--- a/src/hackney.app.src
+++ b/src/hackney.app.src
@@ -4,7 +4,7 @@
 {application, hackney,
   [
     {description, "simple HTTP client"},
-    {vsn, "1.20.0"},
+    {vsn, "1.20.1"},
     {registered, [hackney_pool]},
     {applications, [kernel,
       stdlib,