diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 8e0ce8b..e2c8258
--- a/Gemfile
+++ b/Gemfile
@@ -43,7 +43,7 @@ gem "lograge", "~> 0.11.2"
 gem "logstash-event", "~> 1.2", ">= 1.2.02"
 gem "logstash-logger", "~> 0.26.1"
 gem "namae", "~> 1.0", ">= 1.0.1"
-gem "nokogiri", "~> 1.10", ">= 1.10.7"
+gem "nokogiri", "~> 1.19"
 gem "rack-cors", "~> 1.0", require: "rack/cors"
 gem "rouge", "~> 3.15"
 gem "simple_form", "~> 4.1.0"
diff --git a/Gemfile.lock b/Gemfile.lock
old mode 100755
new mode 100644
index 1cbaadb..b15ce09
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -445,7 +445,7 @@ GEM
       activerecord (>= 4.0.0)
       activesupport (>= 4.0.0)
     nio4r (2.7.5)
-    nokogiri (1.18.10)
+    nokogiri (1.19.1)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     oauth2 (1.4.11)
@@ -797,7 +797,7 @@ DEPENDENCIES
   mysql2 (~> 0.5.0)
   namae (~> 1.0, >= 1.0.1)
   nilify_blanks (~> 1.3)
-  nokogiri (~> 1.10, >= 1.10.7)
+  nokogiri (~> 1.19)
   oauth2 (~> 1.4)
   oj (>= 2.8.3)
   oj_mimic_json (~> 1.0, >= 1.0.1)