diff --git a/src/Gemfile b/src/Gemfile
index 6988fcb..9734b71 100644
--- a/src/Gemfile
+++ b/src/Gemfile
@@ -1,28 +1,36 @@
 source "https://rubygems.org"
 ruby RUBY_VERSION
 
 # Hello! This is where you manage which Jekyll version is used to run.
 # When you want to use a different version, change it below, save the
 # file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
 #
 #     bundle exec jekyll serve
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
 gem "jekyll", "3.3.0"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "minima", "~> 2.0"
 
 # Needed by jekyll-assets
-gem "json"
+# (Force versions compatible with ruby 2.0)
+group :jekyll_assets_deps do
+   gem "public_suffix", "< 3.0"
+   gem "ruby_dep", "< 1.4"
+   gem "rb-inotify", "< 0.10"
+   gem "listen", "< 3.1"
+   gem "jekyll-watch", "< 1.5.1"
+   gem "json"
+end
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
 # gem "github-pages", group: :jekyll_plugins
 
 # If you have any plugins, put them here!
 group :jekyll_plugins do
    gem "jekyll-assets"
    gem "font-awesome-sass"
 end
diff --git a/src/Gemfile.lock b/src/Gemfile.lock
index daaf66e..7352c59 100644
--- a/src/Gemfile.lock
+++ b/src/Gemfile.lock
@@ -1,66 +1,78 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.4.0)
+    addressable (2.6.0)
+      public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.5)
-    extras (0.1.0)
+    extras (0.3.0)
       forwardable-extended (~> 2.5)
-    fastimage (2.0.1)
-      addressable (~> 2)
+    fastimage (2.1.5)
     ffi (1.11.1)
     font-awesome-sass (4.7.0)
       sass (>= 3.2)
     forwardable-extended (2.6.0)
     jekyll (3.3.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
       kramdown (~> 1.3)
       liquid (~> 3.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
       rouge (~> 1.7)
       safe_yaml (~> 1.0)
-    jekyll-assets (2.2.8)
-      extras (~> 0.1)
+    jekyll-assets (2.4.0)
+      concurrent-ruby (~> 1.0)
+      extras (~> 0.2)
       fastimage (~> 2.0, >= 1.8)
       jekyll (~> 3.1, >= 3.0)
       pathutil (>= 0.8)
-      rack (> 1, < 2)
-      sprockets (~> 3.3, < 3.7)
-    jekyll-sass-converter (1.4.0)
+      rack (~> 1.6)
+      sprockets (~> 3.3, < 3.8)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    json (2.0.2)
-    kramdown (1.12.0)
+    json (2.2.0)
+    kramdown (1.17.0)
     liquid (3.0.6)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
     minima (2.0.0)
-    pathutil (0.14.0)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    public_suffix (2.0.5)
     rack (1.6.11)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rouge (1.11.1)
-    safe_yaml (1.0.4)
-    sass (3.4.22)
-    sprockets (3.6.3)
+    ruby_dep (1.3.1)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   font-awesome-sass
   jekyll (= 3.3.0)
   jekyll-assets
+  jekyll-watch (< 1.5.1)
   json
+  listen (< 3.1)
   minima (~> 2.0)
+  public_suffix (< 3.0)
+  rb-inotify (< 0.10)
+  ruby_dep (< 1.4)