diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..288ea55
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+# Use version of Ruby from Github pages: https://pages.github.com/versions/
+FROM ruby:2.7-alpine
+
+WORKDIR /srv/jekyll
+
+RUN apk update && apk add --no-cache build-base gcc cmake git bash
+
+# Use version of Bundler from Github pages: https://pages.github.com/versions/
+RUN gem install --user-install bundler -v "2.3.10"
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 726d0b0..c1a9755 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     base64 (0.2.0)
-    bigdecimal (3.1.6)
+    bigdecimal (3.1.7)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -23,10 +23,9 @@ GEM
     commonmarker (0.23.10)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    dnsruby (1.70.0)
+    dnsruby (1.71.0)
       simpleidn (~> 0.2.1)
-    drb (2.2.0)
-      ruby2_keywords
+    drb (2.2.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -34,10 +33,11 @@ GEM
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.9.1)
-    faraday (2.9.0)
-      faraday-net_http (>= 2.0, < 3.2)
-    faraday-net_http (3.1.0)
-      net-http
+    faraday (2.8.1)
+      base64
+      faraday-net_http (>= 2.0, < 3.1)
+      ruby2_keywords (>= 0.0.4)
+    faraday-net_http (3.0.2)
     ffi (1.16.3)
     forwardable-extended (2.6.0)
     gemoji (4.1.0)
@@ -96,7 +96,7 @@ GEM
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.8.0)
-    i18n (1.14.1)
+    i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     jekyll (3.9.5)
       addressable (~> 2.4)
@@ -215,19 +215,13 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.5)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.22.2)
+    minitest (5.22.3)
     mutex_m (0.2.0)
-    net-http (0.4.1)
-      uri
-    nokogiri (1.16.2)
-      mini_portile2 (~> 2.8.2)
-      racc (~> 1.4)
-    nokogiri (1.16.2-x86_64-linux)
+    nokogiri (1.15.6-aarch64-linux)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
@@ -264,11 +258,9 @@ GEM
       unf_ext
     unf_ext (0.0.9.1)
     unicode-display_width (1.8.0)
-    uri (0.13.0)
 
 PLATFORMS
-  ruby
-  x86_64-linux
+  aarch64-linux-musl
 
 DEPENDENCIES
   github-pages (= 231)
diff --git a/docker-compose.yml b/docker-compose.yml
index abdb2bb..7c0fe2d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 version: '3.2'
 services:
     jekyll:
-        image: jekyll/jekyll:4.2.0
+        build: ./
         environment:
             - JEKYLL_ENV=development
         # Frustratingly, Docker has problems with inotify: https://github.com/jekyll/jekyll-watch/issues/17