diff --git a/Gemfile.lock b/Gemfile.lock
index a793915..31a14f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     asciidoctor-diagram (1.5.4)
       asciidoctor (~> 1.5.0)
     ast (2.4.0)
-    autoprefixer-rails (6.7.2)
+    autoprefixer-rails (9.7.4)
       execjs
     awestruct (0.6.0)
       asciidoctor (~> 1.5, >= 1.5.2)
@@ -22,9 +22,9 @@ GEM
       rack (~> 2.0)
       rest-client (~> 2.0)
       tilt (~> 2.0, >= 2.0.1)
-    bootstrap-sass (3.3.7)
+    bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
-      sass (>= 3.3.4)
+      sassc (>= 2.0.0)
     chunky_png (1.3.8)
     coderay (1.1.2)
     compass (1.0.3)
@@ -114,7 +114,9 @@ GEM
       ansi
       ast
     ruby_dep (1.5.0)
-    sass (3.4.23)
+    sass (3.4.25)
+    sassc (2.2.1)
+      ffi (~> 1.9)
     shellany (0.0.1)
     slim (3.0.7)
       temple (~> 0.7.6)