diff --git a/auth/auth.php b/auth/auth.php
index 526af95..ab83fc7 100644
--- a/auth/auth.php
+++ b/auth/auth.php
@@ -8,6 +8,6 @@ session_set_cookie_params({{ site.lifetime }});
 
 date_default_timezone_set("{{ site.timezone }}");
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo('OK');
 
diff --git a/bash/bash.sh b/bash/bash.sh
index 31f4aa0..e0e5148 100755
--- a/bash/bash.sh
+++ b/bash/bash.sh
@@ -2,7 +2,7 @@
 permalink: /cgi/bash/index.sh
 ---
 
-echo "Content-type: text/plain"
+echo "Content-type: text/plain; charset=utf-8"
 echo
 echo "Hello from bash!"
 echo
diff --git a/challenge/challenge.php b/challenge/challenge.php
index f8e4ee5..7c133e9 100644
--- a/challenge/challenge.php
+++ b/challenge/challenge.php
@@ -22,6 +22,6 @@ $_SESSION["two"] = rand(0, 9);
 
 $challenge = $_SESSION["one"] . " + " . $_SESSION["two"];
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo($challenge);
 ?>
diff --git a/gitlog/gitlog.sh b/gitlog/gitlog.sh
index 321170c..7777637 100755
--- a/gitlog/gitlog.sh
+++ b/gitlog/gitlog.sh
@@ -2,7 +2,7 @@
 permalink: /cgi/gitlog/index.sh
 ---
 
-echo "Content-type: text/plain"
+echo "Content-type: text/plain; charset=utf-8"
 echo
 cat {{ site.document_root }}/gitlog.html
 
diff --git a/ifconfig/ifconfig.php b/ifconfig/ifconfig.php
index fa588f4..b42a041 100644
--- a/ifconfig/ifconfig.php
+++ b/ifconfig/ifconfig.php
@@ -13,6 +13,6 @@ if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
   $ip = $_SERVER['REMOTE_ADDR'];
 }
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo($ip);
 ?>
diff --git a/lua/lua.lua b/lua/lua.lua
index 5ccde35..a97a770 100755
--- a/lua/lua.lua
+++ b/lua/lua.lua
@@ -2,7 +2,7 @@
 permalink: /cgi/lua/index.lua
 ---
 
-print("Content-type: text/plain")
+print("Content-type: text/plain; charset=utf-8")
 print()
 print("Hello from Lua!")
 print()
diff --git a/mail/mail.php b/mail/mail.php
index e4498a8..fbcebc4 100644
--- a/mail/mail.php
+++ b/mail/mail.php
@@ -37,7 +37,7 @@ if ($_POST["sum"] == $sum) {
   unset($_SESSION["two"]);
 }
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 if ($error=="") {
   echo("{{ site.mail_thank_you }}");
 } else {
diff --git a/perl/perl.pl b/perl/perl.pl
index 1ed32ff..9714e91 100755
--- a/perl/perl.pl
+++ b/perl/perl.pl
@@ -6,13 +6,11 @@ use warnings;
 use strict;
 use POSIX qw(strftime);
 
-my $date = strftime "%m/%d/%Y", localtime;
-
-print("Content-type: text/plain\n\n");
-print "Hello from Perl!\n\n";
-print $date;
-print "\n\n";
-
+print("Content-type: text/plain; charset=utf-8\n\n");
+print("Hello from Perl!\n\n");
+print("print(strftime('%m/%d/%Y %Z', localtime));\n");
+print(strftime("%m/%d/%Y %Z", localtime));
+print("\n\n");
 print('my @i = (1..10); for(@i) { print("$_", "\n"); }');
 print("\n");
 
diff --git a/php/php.php b/php/php.php
index 4b35b01..b2521c3 100644
--- a/php/php.php
+++ b/php/php.php
@@ -4,7 +4,7 @@ permalink: /cgi/php/index.php
 
 <?php
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 
 echo('Hello from PHP!');
 echo("\n\n");
diff --git a/python/python.py b/python/python.py
index 8138420..1da0aec 100755
--- a/python/python.py
+++ b/python/python.py
@@ -6,7 +6,7 @@ from datetime import datetime
 #from http import HTTPStatus
 #from pprint import pprint
 
-print("Content-type: text/plain\n")
+print("Content-type: text/plain; charset=utf-8\n")
 #print(HTTPStatus.OK.value)
 print("Hello from Python!")
 print("")
diff --git a/ruby/ruby.rb b/ruby/ruby.rb
index 5472daf..c8ab6bd 100755
--- a/ruby/ruby.rb
+++ b/ruby/ruby.rb
@@ -2,7 +2,7 @@
 permalink: /cgi/ruby/index.rb
 ---
 
-puts('Content-type: text/plain')
+puts('Content-type: text/plain; charset=utf-8')
 puts
 puts('Hello from Ruby!')
 puts
diff --git a/timestamp/timestamp.php b/timestamp/timestamp.php
index 19d0e92..42f9ca1 100644
--- a/timestamp/timestamp.php
+++ b/timestamp/timestamp.php
@@ -14,6 +14,6 @@ $milliseconds = floor(microtime(true) * 1000);
 
 #echo($timestamp . "_" . time() . "_" . $milliseconds);
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo($timestamp . '.' . microtime(true));
 ?>
diff --git a/uname/uname.php b/uname/uname.php
index 497351b..2ab056f 100644
--- a/uname/uname.php
+++ b/uname/uname.php
@@ -9,6 +9,6 @@ $pos = strpos($uname, '-', 0);
 
 $res = substr($uname, 0, $pos);
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo($res);
 ?>
diff --git a/uptime/uptime.php b/uptime/uptime.php
index bcb371d..c7beeeb 100644
--- a/uptime/uptime.php
+++ b/uptime/uptime.php
@@ -6,6 +6,6 @@ permalink: /cgi/uptime/
 $uptime = shell_exec('uptime');
 $version = shell_exec('uptime -V');
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo('Server ' . substr($version, 0, -1) . ': ' . $uptime);
 ?>
diff --git a/whois/whois.php b/whois/whois.php
index 085ce65..fff6f1e 100644
--- a/whois/whois.php
+++ b/whois/whois.php
@@ -24,6 +24,6 @@ $cmd = 'whois ' . $host;
 
 $whois = shell_exec($cmd);
 
-header('Content-Type: text/plain');
+header('Content-Type: text/plain; charset=utf-8');
 echo($whois);
 ?>