diff --git a/.tool-versions b/.tool-versions
index b80e361..960884c 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-erlang 26.2.2
-elixir 1.16.1
+erlang 27.0
+elixir 1.17.1-otp-27
diff --git a/README.md b/README.md
index 12b931c..7eee92f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # rebar3_ex_doc
 
 [![Build Status](https://github.com/starbelly/rebar3_ex_doc/actions/workflows/ci.yml/badge.svg)](https://github.com/starbelly/rebar3_ex_doc/actions/workflows/ci.yml)
-[![Erlang/OTP Version](https://img.shields.io/badge/erlang%2Fotp-%2024-blue)](http://www.erlang.org)
+[![Erlang/OTP Versions](https://img.shields.io/badge/erlang%2Fotp-25%7C26%7C27-blue)](http://www.erlang.org)
 [![Hex Version](https://img.shields.io/hexpm/v/rebar3_ex_doc.svg)](https://hex.pm/packages/rebar3_ex_doc)
 [![Hex Docs](https://img.shields.io/badge/hex-docs-lightgreen.svg)](https://hexdocs.pm/rebar3_ex_doc/)
 [![Total Download](https://img.shields.io/hexpm/dt/rebar3_ex_doc.svg)](https://hex.pm/packages/rebar3_ex_doc)