diff --git a/week4/sample_app/Gemfile.lock b/week4/sample_app/Gemfile.lock
index 1816408..444ca55 100644
--- a/week4/sample_app/Gemfile.lock
+++ b/week4/sample_app/Gemfile.lock
@@ -57,7 +57,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.5)
-    crass (1.0.4)
+    crass (1.0.6)
     erubi (1.8.0)
     execjs (2.7.0)
     ffi (1.11.1)
@@ -90,7 +90,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.2.3)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)
@@ -98,7 +98,7 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.2)
     mini_mime (1.0.1)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.10.3)
     minitest-reporters (1.1.14)
       ansi
@@ -108,8 +108,9 @@ GEM
     multi_json (1.13.1)
     nenv (0.3.0)
     nio4r (2.3.1)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.10)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -118,6 +119,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     puma (3.9.1)
+    racc (1.6.1)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)