diff --git a/.ruby-version b/.ruby-version
deleted file mode 100644
index 9c25013..0000000
--- a/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-3.3.6
diff --git a/Dockerfile b/Dockerfile
index 4687452..322fc6d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@
 # For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
-ARG RUBY_VERSION=3.3.6
+ARG RUBY_VERSION=3.4.1
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here
diff --git a/Gemfile b/Gemfile
index 49a3e7c..0741b98 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source "https://rubygems.org"
 
+ruby "3.4.1"
+
 gem "rails", github: "rails/rails", branch: "main"
 # The modern asset pipeline for Rails [https://github.com/rails/propshaft]
 gem "propshaft"
diff --git a/Gemfile.lock b/Gemfile.lock
index 50e5c7e..680a04f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -165,6 +165,7 @@ GEM
     marcel (1.0.4)
     matrix (0.4.2)
     mini_mime (1.1.5)
+    mini_portile2 (2.8.8)
     minitest (5.25.2)
     msgpack (1.7.5)
     net-imap (0.5.1)
@@ -177,11 +178,8 @@ GEM
     net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.4)
-    nokogiri (1.16.7-aarch64-linux)
-      racc (~> 1.4)
-    nokogiri (1.16.7-arm64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.16.7-x86_64-linux)
+    nokogiri (1.16.7)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.26.3)
     parser (3.3.6.0)
@@ -269,9 +267,8 @@ GEM
       fugit (~> 1.11.0)
       railties (>= 7.1)
       thor (~> 1.3.1)
-    sqlite3 (2.3.1-aarch64-linux-gnu)
-    sqlite3 (2.3.1-arm64-darwin)
-    sqlite3 (2.3.1-x86_64-linux-gnu)
+    sqlite3 (2.3.1)
+      mini_portile2 (~> 2.8.0)
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringio (3.1.2)
@@ -334,5 +331,8 @@ DEPENDENCIES
   tzinfo-data
   web-console
 
+RUBY VERSION
+   ruby 3.4.1p0
+
 BUNDLED WITH
-   2.5.23
+   2.6.2