diff --git a/.tool-versions b/.tool-versions
index 700e3ee5..7f2fa702 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 elixir 1.19.5-otp-28
-erlang 28.3.3
+erlang 28.4
 nodejs 24.13.0
diff --git a/Dockerfile b/Dockerfile
index 81dfe3fb..dcaac13c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@
 #   - Ex: hexpm/elixir:1.17.2-erlang-27.1-debian-bullseye-20240904-slim
 #
 ARG ELIXIR_VERSION=1.19.5
-ARG OTP_VERSION=28.3.3
+ARG OTP_VERSION=28.4
 ARG DEBIAN_VERSION=trixie-20260223-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"