diff --git a/Gemfile.lock b/Gemfile.lock
index 663085b7a..65fa9f436 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -64,8 +64,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     arel (6.0.4)
     awesome_print (1.7.0)
     aws-sdk (2.7.4)
@@ -108,7 +108,7 @@ GEM
     cityhash (0.8.1)
     coderay (1.1.1)
     colorize (0.7.7)
-    crack (0.4.2)
+    crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.2)
     daemons (1.2.3)
@@ -156,6 +156,7 @@ GEM
       multi_json (~> 1.11)
       os (~> 0.9)
       signet (~> 0.7)
+    hashdiff (0.3.7)
     highline (1.7.8)
     hike (1.2.3)
     http (2.2.2)
@@ -246,7 +247,7 @@ GEM
     pry-byebug (3.4.2)
       byebug (~> 9.0)
       pry (~> 0.10)
-    public_suffix (2.0.5)
+    public_suffix (3.0.1)
     rack (1.6.5)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -385,9 +386,10 @@ GEM
     unicorn-worker-killer (0.4.4)
       get_process_mem (~> 0)
       unicorn (>= 4, < 6)
-    webmock (1.21.0)
+    webmock (3.1.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
+      hashdiff
     webrobots (0.1.2)
     whenever (0.9.7)
       chronic (>= 0.6.3)
diff --git a/test/unit/post_view_count_service_test.rb b/test/unit/post_view_count_service_test.rb
index 3099bf005..a20e8d5e0 100644
--- a/test/unit/post_view_count_service_test.rb
+++ b/test/unit/post_view_count_service_test.rb
@@ -49,6 +49,7 @@ class PostViewCountServiceTest < ActiveSupport::TestCase
 
     context "failure" do
       setup do
+        @date = "2000-01-01"
         stub_request(:get, "localhost:1234/post_views/rank").with(query: {"date" => @date}).to_return(body: "", status: 400)
       end