diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 77b6348..e0342ab 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,6 +1,6 @@
 {
 	"name": "Jekyll",
-	"image": "mcr.microsoft.com/devcontainers/jekyll:0-bullseye",
+	"image": "mcr.microsoft.com/devcontainers/jekyll:2.7-bullseye",
 	"features": {
 		"ghcr.io/devcontainers/features/node:1": {
 			"version": "lts"
diff --git a/Gemfile b/Gemfile
index 48e7760..d1e5e16 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,4 @@ source "https://rubygems.org"
 # gem "rails"
 gem "jekyll-scholar"
 gem "rake"
+gem "webrick"
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index dbb315c..71e0512 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -55,7 +55,7 @@ GEM
       kramdown (~> 2.0)
     latex-decode (0.3.1)
     liquid (4.0.3)
-    listen (3.2.1)
+    listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
@@ -75,13 +75,15 @@ GEM
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.6.1)
+    webrick (1.8.1)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
   jekyll-scholar
   rake
+  webrick
 
 BUNDLED WITH
    2.3.24