diff --git a/src/kcodecsbase64.h b/src/kcodecsbase64.h
--- a/src/kcodecsbase64.h
+++ b/src/kcodecsbase64.h
@@ -30,16 +30,16 @@
   a binary to text encoding scheme based on @ref RFC1421.
 
   @glossary @anchor RFC1421 @anchor rfc1421 @b RFC @b 1421:
-  RFC that defines the <a href="http://tools.ietf.org/html/rfc1421">
+  RFC that defines the <a href="https://tools.ietf.org/html/rfc1421">
   Privacy Enhancement for Internet Electronic Mail:  Part I:
   Message Encryption and Authentication Procedures</a>.
 
   @glossary @anchor RFC2045 @anchor rfc2045 @b RFC @b 2045:
-  RFC that defines the <a href="http://tools.ietf.org/html/rfc2045">
+  RFC that defines the <a href="https://tools.ietf.org/html/rfc2045">
   MIME Part One: Format of Internet Message Bodies</a>.
 
   @glossary @anchor RFC2047 @anchor rfc2047 @b RFC @b 2047:
-  RFC that defines the <a href="http://tools.ietf.org/html/rfc2047">
+  RFC that defines the <a href="https://tools.ietf.org/html/rfc2047">
   MIME Part Three: Message Header Extensions for Non-ASCII Text</a>.
 
   @glossary @anchor RFC2047B @anchor rfc2047b @b RFC @b 2047B:
diff --git a/src/kcodecsqp.h b/src/kcodecsqp.h
--- a/src/kcodecsqp.h
+++ b/src/kcodecsqp.h
@@ -35,7 +35,7 @@
   Section 4.2 of @ref RFC2047.
 
   @glossary @anchor RFC2231 @anchor rfc2231 @b RFC @b 2231:
-  RFC that defines the <a href="http://tools.ietf.org/html/rfc2231">
+  RFC that defines the <a href="https://tools.ietf.org/html/rfc2231">
   MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages,
   and Continuations</a>.
 */
diff --git a/src/kcodecsuuencode.h b/src/kcodecsuuencode.h
--- a/src/kcodecsuuencode.h
+++ b/src/kcodecsuuencode.h
@@ -28,7 +28,7 @@
 
   @glossary @anchor UUEncode @anchor uuencode @b uuencode:
   a binary to text encoding scheme. For more information, see the
-  <a href="http://en.wikipedia.org/wiki/Uuencode"> Wikipedia Uuencode page</a>.
+  <a href="https://en.wikipedia.org/wiki/Uuencode"> Wikipedia Uuencode page</a>.
 */
 
 #ifndef KCODECS_UUENCODE_H
diff --git a/src/probers/nsSBCSGroupProber.h b/src/probers/nsSBCSGroupProber.h
--- a/src/probers/nsSBCSGroupProber.h
+++ b/src/probers/nsSBCSGroupProber.h
@@ -4,7 +4,7 @@
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
+ * https://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
diff --git a/src/probers/nsSJISProber.h b/src/probers/nsSJISProber.h
--- a/src/probers/nsSJISProber.h
+++ b/src/probers/nsSJISProber.h
@@ -4,7 +4,7 @@
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
+ * https://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License