diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index ad151ed2..e20d0a99 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -10,13 +10,21 @@ RUN useradd --create-home --shell /bin/bash $USER && \
 WORKDIR /home/$USER/site
 
 RUN apt-get update
-RUN apt-get install -y ruby-full && gem install bundler
-RUN python -m pip install --upgrade pip
+
+# Install rvm (https://rvm.io/rvm/install#install-gpg-keys)
+RUN gpg --keyserver keyserver.ubuntu.com --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
+RUN curl -sSL https://get.rvm.io | bash -s stable
+RUN echo 'source /usr/local/rvm/scripts/rvm' >> /etc/bash.bashrc
+
+# Install Ruby, Bundler, and dependencies
+COPY .ruby-version .ruby-version
 COPY Gemfile Gemfile
 COPY Gemfile.lock Gemfile.lock
-RUN bundle install
+RUN /bin/bash -l -c 'rvm install $(cat .ruby-version | tr -d "\n") && gem install bundler && bundle install'
 
+# Install Python dependencies
 COPY .devcontainer/requirements.txt .devcontainer/requirements.txt
+RUN python -m pip install --upgrade pip
 RUN pip install --no-cache-dir -r .devcontainer/requirements.txt
 
 USER $USER
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 00000000..4f5e6973
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.4.5
diff --git a/Gemfile b/Gemfile
index 8a6ef233..8a5c2723 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
+gem "bigdecimal", "~> 3.2.2"
 gem "jekyll", "~> 4.4.1"
 gem "jekyll-feed"
 gem "jekyll-sass-converter", "2.2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index b5cbda39..31f82619 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,6 +4,7 @@ GEM
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
     base64 (0.2.0)
+    bigdecimal (3.2.2)
     colorator (1.1.0)
     concurrent-ruby (1.3.5)
     csv (3.3.2)
@@ -11,9 +12,7 @@ GEM
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    ffi (1.17.1-aarch64-linux-gnu)
-    ffi (1.17.1-x86_64-linux-gnu)
-    ffi (1.17.1-x86_64-linux-musl)
+    ffi (1.17.1)
     forwardable-extended (2.6.0)
     http_parser.rb (0.8.0)
     i18n (1.14.7)
@@ -75,6 +74,7 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
+  bigdecimal (~> 3.2.2)
   jekyll (~> 4.4.1)
   jekyll-feed
   jekyll-sass-converter (= 2.2.0)