diff --git a/Gemfile b/Gemfile
index febbf55..178ec23 100644
--- a/Gemfile
+++ b/Gemfile
@@ -28,3 +28,7 @@ gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 
 gem "webrick", "~> 1.8"
+
+# Ruby 3.4+ removed these from the default gems, but github-pages/jekyll still need them
+gem "csv"
+gem "logger"
diff --git a/_data/members.yml b/_data/members.yml
index b3d27af..132b2aa 100644
--- a/_data/members.yml
+++ b/_data/members.yml
@@ -222,6 +222,13 @@ positions:
         img: "hyehyun.png"
         site: "https://hyehyunchu.vercel.app/"
 
+      - name: Seongeun Jeon
+        lastName: Jeon
+        email: "tjddms422422@gmail.com"
+        career: Visiting Researcher (ROKA)
+        img: "seongeun.jpg"
+        site: ""
+
 
   ## ---------------Undergraduates--------------------
 
diff --git a/assets/img/members/seongeun.jpg b/assets/img/members/seongeun.jpg
new file mode 100644
index 0000000..12f1f9e
Binary files /dev/null and b/assets/img/members/seongeun.jpg differ