diff --git a/lib/core_ext/string.rb b/lib/core_ext/string.rb
index 817d9f9ac..13e0077b6 100644
--- a/lib/core_ext/string.rb
+++ b/lib/core_ext/string.rb
@@ -41,7 +41,7 @@ class String
     return if ActiveRecord::Base.connection_config[:adapter] != 'mysql2'
     self.each_char.select {|c|
       if c.bytes.count > 3
-        puts "WARNING: strip out 4 bytes utf8 chars '#{c}' of '#{ self }'"
+        Rails.logger.warn "strip out 4 bytes utf8 chars '#{c}' of '#{ self }'"
         next
       end
       c
diff --git a/lib/geo_ip/zammad_geo_ip.rb b/lib/geo_ip/zammad_geo_ip.rb
index 130fc6522..9259ae35e 100644
--- a/lib/geo_ip/zammad_geo_ip.rb
+++ b/lib/geo_ip/zammad_geo_ip.rb
@@ -37,7 +37,7 @@ class GeoIp::ZammadGeoIp
 
       Cache.write( cache_key, data, { expires_in: 90.days } )
     rescue => e
-      puts "ERROR: #{host}#{url}: " + e.inspect
+      Rails.logger.error "#{host}#{url}: #{e.inspect}"
       Cache.write( cache_key, data, { expires_in: 60.minutes } )
     end
     data
diff --git a/lib/search_index_backend.rb b/lib/search_index_backend.rb
index 83f7bc43c..8a66d3f32 100644
--- a/lib/search_index_backend.rb
+++ b/lib/search_index_backend.rb
@@ -57,7 +57,7 @@ create/update/delete index
         password: Setting.get('es_password'),
       }
     )
-    puts "# #{response.code.to_s}"
+    Rails.logger.info "# #{response.code}"
     return true if response.success?
     raise response.inspect
   end
@@ -108,7 +108,7 @@ remove whole data from index
     url = build_url( type, o_id )
     return if !url
 
-    puts "# curl -X DELETE \"#{url}\""
+    Rails.logger.info "# curl -X DELETE \"#{url}\""
 
     response = UserAgent.delete(
       url,
@@ -210,7 +210,7 @@ return search result
 
     Rails.logger.info "# #{response.code.to_s}"
     if !response.success?
-      puts "ERROR: #{response.inspect}"
+      Rails.logger.error "ERROR: #{response.inspect}"
       return []
     end
     data = response.data
@@ -220,7 +220,7 @@ return search result
     return ids if !data['hits']
     return ids if !data['hits']['hits']
     data['hits']['hits'].each { |item|
-      puts "... #{item['_type'].to_s} #{item['_id'].to_s}"
+      Rails.logger.info "... #{item['_type'].to_s} #{item['_id'].to_s}"
       data = {
         id: item['_id'],
         type: item['_type'],
diff --git a/lib/time_calculation.rb b/lib/time_calculation.rb
index 46f031cd0..e8666860e 100644
--- a/lib/time_calculation.rb
+++ b/lib/time_calculation.rb
@@ -24,9 +24,9 @@ put working hours matrix and timezone in function, returns UTC working hours mat
       begin
         time_diff = Time.parse(start_time.to_s).in_time_zone(timezone).utc_offset
      rescue Exception => e
-       puts "ERROR: Can't fine tomezone #{timezone}"
-       puts e.inspect
-       puts e.backtrace
+       Rails.logger.error "Can't fine tomezone #{timezone}"
+       Rails.logger.error e.inspect
+       Rails.logger.error e.backtrace
       end
     end
     beginning_of_workday = Time.parse("1977-10-27 #{config['beginning_of_workday']}")