diff --git a/deploy/deploy.yml b/deploy/deploy.yml
index e40a4e5f..5e878296 100644
--- a/deploy/deploy.yml
+++ b/deploy/deploy.yml
@@ -60,7 +60,7 @@
     - name: Configure Bundler to run in deployment mode
       command:
         chdir: "{{ remote_app_root }}"
-        cmd: /opt/ruby-3.3.0/bin/bundle config set --local deployment true
+        cmd: /opt/ruby-3.3.4/bin/bundle config set --local deployment true
 
     # This ensures that, while attempting our current deploy, we don't
     # accidentally delete gems out from under the currently-running version.
@@ -70,7 +70,7 @@
     - name: Configure Bundler to *not* clean up old gems when installing
       command:
         chdir: "{{ remote_app_root }}"
-        cmd: /opt/ruby-3.3.0/bin/bundle config set --local clean false
+        cmd: /opt/ruby-3.3.4/bin/bundle config set --local clean false
 
     # NOTE: Bundler recommends this, and they're pretty smart about it: if the
     # Gemfile changes, this shouldn't disrupt the currently-running version,
@@ -79,7 +79,7 @@
     - name: Configure Bundler to use the bundle folder shared by all app versions
       command:
         chdir: "{{ remote_app_root }}"
-        cmd: "/opt/ruby-3.3.0/bin/bundle config set --local path {{ remote_project_root}}/shared/bundle"
+        cmd: "/opt/ruby-3.3.4/bin/bundle config set --local path {{ remote_project_root}}/shared/bundle"
 
     - name: Run `bundle install` to install dependencies in remote folder
       command:
@@ -87,7 +87,7 @@
         # The `--local` flag instructs Bundler to use the cached dependencies
         # in `vendor/cache`, instead of reading from the web, which is much
         # faster and more reliable!
-        cmd: /opt/ruby-3.3.0/bin/bundle install --local
+        cmd: /opt/ruby-3.3.4/bin/bundle install --local
 
     - name: Update the `current` folder to point to the new version
       file:
@@ -111,7 +111,7 @@
     - name: Clean up gems no longer used in the current app version
       command:
         chdir: "{{ remote_app_root }}"
-        cmd: /opt/ruby-3.3.0/bin/bundle clean
+        cmd: /opt/ruby-3.3.4/bin/bundle clean
       when: not skip_set_as_current
 
     - name: Find older app versions to clean up
diff --git a/deploy/files/impress.service b/deploy/files/impress.service
index 10c46d48..6ca8a1fa 100644
--- a/deploy/files/impress.service
+++ b/deploy/files/impress.service
@@ -5,7 +5,7 @@ Description=Dress to Impress webapp
 User=impress
 Restart=always
 WorkingDirectory=/srv/impress/current
-ExecStart=/opt/ruby-3.3.0/bin/bundle exec falcon host
+ExecStart=/opt/ruby-3.3.4/bin/bundle exec falcon host
 Environment="RAILS_ENV=production"
 ; Set EXECJS_RUNTIME to save us from needing to install Node
 Environment="EXECJS_RUNTIME=Disabled"
diff --git a/deploy/setup.yml b/deploy/setup.yml
index c453bfb7..ddeed66b 100644
--- a/deploy/setup.yml
+++ b/deploy/setup.yml
@@ -170,21 +170,21 @@
       git:
         repo: https://github.com/rbenv/ruby-build.git
         dest: /opt/ruby-build
-        version: e1b36a32fb87d61955ac38f1889b7e3cb3b2f407
+        version: d22fa95a6e4c77945304c16ebe0d9513fec98cfb
 
-    - name: Check if Ruby 3.3.0 is already installed
+    - name: Check if Ruby 3.3.4 is already installed
       stat:
-        path: /opt/ruby-3.3.0
+        path: /opt/ruby-3.3.4
       register: ruby_dir
 
-    - name: Install Ruby 3.3.0
-      command: "/opt/ruby-build/bin/ruby-build 3.3.0 /opt/ruby-3.3.0"
+    - name: Install Ruby 3.3.4
+      command: "/opt/ruby-build/bin/ruby-build 3.3.4 /opt/ruby-3.3.4"
       when: not ruby_dir.stat.exists
 
-    - name: Add Ruby 3.3.0 to the global PATH, for developer convenience
+    - name: Add Ruby 3.3.4 to the global PATH, for developer convenience
       copy:
         dest: /etc/profile.d/ruby_path.sh
-        content: PATH="/opt/ruby-3.3.0/bin:$PATH"
+        content: PATH="/opt/ruby-3.3.4/bin:$PATH"
 
     - name: Install system dependencies for impress's Ruby gems
       apt:
@@ -248,14 +248,14 @@
       become_user: impress
       command:
         chdir: /srv/impress/versions/initial-placeholder
-        cmd: /opt/ruby-3.3.0/bin/bundle config set --local deployment true
+        cmd: /opt/ruby-3.3.4/bin/bundle config set --local deployment true
       when: not current_app_version.stat.exists
 
     - name: Install the placeholder app's dependencies
       become_user: impress
       command:
         chdir: /srv/impress/versions/initial-placeholder
-        cmd: /opt/ruby-3.3.0/bin/bundle install
+        cmd: /opt/ruby-3.3.4/bin/bundle install
       when: not current_app_version.stat.exists
 
     - name: Set the placeholder app as the current version