diff --git a/.tool-versions b/.tool-versions
index 28835b66..42d115af 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
-elixir 1.19.5-otp-28
+elixir 1.20.0-rc.3-otp-28
 erlang 28.4.1
 nodejs 24.13.0
diff --git a/Dockerfile b/Dockerfile
index f74c24b4..99be4a35 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@
 #   - https://pkgs.org/ - resource for finding needed packages
 #   - Ex: hexpm/elixir:1.17.2-erlang-27.1-debian-bullseye-20240904-slim
 #
-ARG ELIXIR_VERSION=1.19.5
+ARG ELIXIR_VERSION=1.20.0-rc.3
 ARG OTP_VERSION=28.4.1
 ARG DEBIAN_VERSION=trixie-20260223-slim