changes in Gemfile

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 # gem 'github-pages', group: :jekyll_plugins
-ruby '2.5.7'
+ruby '2.5.5'
 gem 'bundler'
 gem 'jekyll'
 gem 'rack-jekyll'

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
     filesize (0.2.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    github-pages (203)
+    github-pages (204)
       github-pages-health-check (= 1.16.1)
       jekyll (= 3.8.5)
       jekyll-avatar (= 0.7.0)
@@ -47,7 +47,7 @@ GEM
       jekyll-default-layout (= 0.1.4)
       jekyll-feed (= 0.13.0)
       jekyll-gist (= 1.5.0)
-      jekyll-github-metadata (= 2.12.1)
+      jekyll-github-metadata (= 2.13.0)
       jekyll-mentions (= 1.5.1)
       jekyll-optional-front-matter (= 0.3.2)
       jekyll-paginate (= 1.1.0)
@@ -134,8 +134,8 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
-    jekyll-github-metadata (2.12.1)
-      jekyll (~> 3.4)
+    jekyll-github-metadata (2.13.0)
+      jekyll (>= 3.4, < 5.0)
       octokit (~> 4.0, != 4.4.0)
     jekyll-mentions (1.5.1)
       html-pipeline (~> 2.3)
@@ -231,6 +231,11 @@ GEM
       forwardable-extended (~> 2.6)
     progressbar (1.10.1)
     public_suffix (3.1.1)
+    rack (1.6.12)
+    rack-jekyll (0.5.0)
+      jekyll (>= 1.3)
+      listen (>= 1.3)
+      rack (~> 1.5)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -262,8 +267,14 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
+  bundler
   github-pages
+  jekyll
   jekyll-algolia (~> 1.0)
+  rack-jekyll
+
+RUBY VERSION
+   ruby 2.5.5p157
 
 BUNDLED WITH
    2.1.4