diff --git a/library/aes.c b/library/aes.c
index 6d718f4..592ca64 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -19,7 +19,7 @@
 /*
  *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
  *
- *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
+ *  https://csrc.nist.gov/csrc/media/projects/cryptographic-standards-and-guidelines/documents/aes-development/rijndael-ammended.pdf
  *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
  */
 
diff --git a/library/ctr_drbg.c b/library/ctr_drbg.c
index acc4208..fdd753d 100644
--- a/library/ctr_drbg.c
+++ b/library/ctr_drbg.c
@@ -19,7 +19,7 @@
 /*
  *  The NIST SP 800-90 DRBGs are described in the following publication.
  *
- *  http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
+ *  https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-90r.pdf
  */
 
 #include "common.h"