diff --git a/.rubocop.yml b/.rubocop.yml
index 94b2b1a4e..d8b0e5bc2 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -485,6 +485,12 @@ Style/ClassVars:
 Style/CollectionMethods:
   Enabled: true
 
+Style/FileRead:
+  Enabled: true
+
+Style/FileWrite:
+  Enabled: true
+
 Style/HashConversion:
   Enabled: true
 
diff --git a/app/models/concerns/json_exporter.rb b/app/models/concerns/json_exporter.rb
index b06ce42d2..171200fc6 100644
--- a/app/models/concerns/json_exporter.rb
+++ b/app/models/concerns/json_exporter.rb
@@ -2,7 +2,7 @@ module JsonExporter
   def to_json_file(filename)
     data = []
     model.find_each { |record| data << json_values(record) }
-    File.open(filename, "w") { |file| file.write(data.to_json) }
+    File.write(filename, data.to_json)
   end
 
   private
diff --git a/spec/system/admin/machine_learning_spec.rb b/spec/system/admin/machine_learning_spec.rb
index 32a59f281..03a476026 100644
--- a/spec/system/admin/machine_learning_spec.rb
+++ b/spec/system/admin/machine_learning_spec.rb
@@ -216,9 +216,9 @@ describe "Machine learning" do
              kind: "comments_summary",
              updated_at: 2.minutes.from_now)
       comments_file = MachineLearning::DATA_FOLDER.join(MachineLearning.comments_filename)
-      File.open(comments_file, "w") { |file| file.write([].to_json) }
+      File.write(comments_file, [].to_json)
       proposals_comments_summary_file = MachineLearning::DATA_FOLDER.join(MachineLearning.proposals_comments_summary_filename)
-      File.open(proposals_comments_summary_file, "w") { |file| file.write([].to_json) }
+      File.write(proposals_comments_summary_file, [].to_json)
     end
 
     visit admin_machine_learning_path