Update date in copyright line
diff --git a/library/sha256.c b/library/sha256.c
index 4b393d0..28f09e5 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -1,7 +1,7 @@
 /*
  *  FIPS-180-2 compliant SHA-256 implementation
  *
- *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  *