diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 71a73eb..f251e78 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # Update the VARIANT arg in docker-compose.yml to pick an Elixir version: 1.9, 1.10, 1.10.4
-ARG VARIANT="1.18.3"
+ARG VARIANT="1.18.4"
 FROM elixir:${VARIANT}
 
 # This Dockerfile adds a non-root user with sudo access. Update the “remoteUser” property in
diff --git a/.devcontainer/compose.yml b/.devcontainer/compose.yml
index 895fcc1..0b260a3 100644
--- a/.devcontainer/compose.yml
+++ b/.devcontainer/compose.yml
@@ -5,7 +5,7 @@ services:
       dockerfile: Dockerfile
       args:
         # Elixir Version: 1.9, 1.10, 1.10.4, ...
-        VARIANT: '1.18.3'
+        VARIANT: '1.18.4'
         # Phoenix Version: 1.4.17, 1.5.4, ...
         PHOENIX_VERSION: '1.7.21'
         # Node Version: 12, 14, ...
diff --git a/.tool-versions b/.tool-versions
index 43e9701..962161c 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-elixir 1.18.3-otp-27
+elixir 1.18.4-otp-27
 erlang 27.3.4
diff --git a/Dockerfile b/Dockerfile
index ae45180..ab43d07 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,9 +13,9 @@
 #   - https://pkgs.org/ - resource for finding needed packages
 #   - Ex: hexpm/elixir:1.15.4-erlang-26.0.2-debian-bullseye-20230612-slim
 #
-ARG ELIXIR_VERSION=1.18.3
+ARG ELIXIR_VERSION=1.18.4
 ARG OTP_VERSION=27.3.4
-ARG DEBIAN_VERSION=bullseye-20250428-slim
+ARG DEBIAN_VERSION=bullseye-20250520-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
 ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
diff --git a/README.md b/README.md
index 3539e1b..3aa73ba 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ The purpose of this example is to provide details as to how one would go about u
 
 ## Software requirements
 
-- Elixir 1.18.3 or newer
+- Elixir 1.18.4 or newer
 
 - Erlang 27.3.2 or newer
 
diff --git a/mix.exs b/mix.exs
index 4ef9dc0..2e825be 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ defmodule ZeroPhoenix.Mixfile do
     [
       app: :zero_phoenix,
       version: "3.6.0",
-      elixir: "~> 1.18.3",
+      elixir: "~> 1.18.4",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),
diff --git a/mix.lock b/mix.lock
index 5559ba8..bba068c 100644
--- a/mix.lock
+++ b/mix.lock
@@ -4,7 +4,7 @@
   "absinthe_plug": {:hex, :absinthe_plug, "1.5.9", "4f66fd46aecf969b349dd94853e6132db6d832ae6a4b951312b6926ad4ee7ca3", [:mix], [{:absinthe, "~> 1.7", [hex: :absinthe, repo: "hexpm", optional: false]}, {:plug, "~> 1.4", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "dcdc84334b0e9e2cd439bd2653678a822623f212c71088edf0a4a7d03f1fa225"},
   "bandit": {:hex, :bandit, "1.3.0", "6a4e8d7c9ea721edd02c389e2cc867890cd96f83116e71ddf1ccbdd80661550c", [:mix], [{:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:thousand_island, "~> 1.0", [hex: :thousand_island, repo: "hexpm", optional: false]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "bda37d6c614d74778a5dc43b8bcdc3245cd30619eab0342f58042f968f2165da"},
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
-  "castore": {:hex, :castore, "1.0.13", "b735ea45d87f027128debaf662c6cdf618604f530bec554cc60c195f2a55b506", [:mix], [], "hexpm", "ec09e81a9c3db92d27c6651d119d8adc6d1cbbb3d90f8c1293eee2af590bf55d"},
+  "castore": {:hex, :castore, "1.0.14", "4582dd7d630b48cf5e1ca8d3d42494db51e406b7ba704e81fbd401866366896a", [:mix], [], "hexpm", "7bc1b65249d31701393edaaac18ec8398d8974d52c647b7904d01b964137b9f4"},
   "connection": {:hex, :connection, "1.1.0", "ff2a49c4b75b6fb3e674bfc5536451607270aac754ffd1bdfe175abe4a6d7a68", [:mix], [], "hexpm", "722c1eb0a418fbe91ba7bd59a47e28008a189d47e37e0e7bb85585a016b2869c"},
   "cors_plug": {:hex, :cors_plug, "3.0.3", "7c3ac52b39624bc616db2e937c282f3f623f25f8d550068b6710e58d04a0e330", [:mix], [{:plug, "~> 1.13", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "3f2d759e8c272ed3835fab2ef11b46bddab8c1ab9528167bd463b6452edf830d"},
   "cowboy": {:hex, :cowboy, "2.10.0", "ff9ffeff91dae4ae270dd975642997afe2a1179d94b1887863e43f681a203e26", [:make, :rebar3], [{:cowlib, "2.12.1", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "1.8.0", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "3afdccb7183cc6f143cb14d3cf51fa00e53db9ec80cdcd525482f5e99bc41d6b"},