diff --git a/Gemfile b/Gemfile
index 9398d1df9..d4247ee43 100644
--- a/Gemfile
+++ b/Gemfile
@@ -55,8 +55,10 @@ gem 'coffee-rails'
 
 # Using mini_racer instead of nodejs, because of errors on Jenkins.
 # mini_racer can only be built with gcc >= 4.7. Our Jenkins uses 4.4.7
+# Lock libv8 because mini_racer doesn't. -_-
+gem 'libv8'
 gem 'mini_racer'
-gem 'sass-rails', '~> 5'
+gem 'sass-rails' # , '~> 5'
 gem 'uglifier'
 
 # Locked to 3.3.x, because 3.4.0 expects sassc, which can only be built with gcc
diff --git a/Gemfile.lock b/Gemfile.lock
index edfbe9af2..ac595bae4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -258,7 +258,7 @@ GEM
       kaminari (>= 0.13.0)
       rails
     kaminari-core (1.2.1)
-    libv8 (6.7.288.46.1)
+    libv8 (8.4.255.0)
     loofah (2.8.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -272,8 +272,8 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
-    mini_racer (0.2.4)
-      libv8 (>= 6.3)
+    mini_racer (0.3.1)
+      libv8 (~> 8.4.255)
     minitest (5.14.2)
     minitest-reporters (1.3.6)
       ansi
@@ -552,6 +552,7 @@ DEPENDENCIES
   jquery-ui-rails
   kaminari
   kaminari-bootstrap
+  libv8
   mini_racer
   minitest-reporters
   mocha
@@ -584,7 +585,7 @@ DEPENDENCIES
   rubocop-minitest
   rubocop-performance
   rubocop-rails
-  sass-rails (~> 5)
+  sass-rails
   sdoc
   seed-fu
   selectize-rails
diff --git a/images/s2i/Dockerfile b/images/s2i/Dockerfile
index 5cc2255e3..dce3afef7 100644
--- a/images/s2i/Dockerfile
+++ b/images/s2i/Dockerfile
@@ -10,7 +10,7 @@ RUN \
   set -x && \
   yum install -y \
     # for active storage gem
-    ImageMagick poppler libpoppler && \
+    v8 ImageMagick poppler libpoppler && \
   # Call restore-artifacts sscript when assembling
   sed '/Installing application source/i $STI_SCRIPTS_PATH/restore-artifacts' \
     -i $STI_SCRIPTS_PATH/assemble && \