diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
index ed7a1fd..1cf409e 100644
--- a/lib/decompress_unlzma.c
+++ b/lib/decompress_unlzma.c
@@ -8,7 +8,7 @@
  *implementation for lzma.
  *Copyright (C) 2006  Aurelien Jacobs < aurel@gnuage.org >
  *
- *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
+ *Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/)
  *Copyright (C) 1999-2005  Igor Pavlov
  *
  *Copyrights of the parts, see headers below.
@@ -56,7 +56,7 @@
 /* Small range coder implementation for lzma.
  *Copyright (C) 2006  Aurelien Jacobs < aurel@gnuage.org >
  *
- *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
+ *Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/)
  *Copyright (c) 1999-2005  Igor Pavlov
  */
 
@@ -213,7 +213,7 @@
  * Small lzma deflate implementation.
  * Copyright (C) 2006  Aurelien Jacobs < aurel@gnuage.org >
  *
- * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
+ * Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/)
  * Copyright (C) 1999-2005  Igor Pavlov
  */