diff --git a/includes/cache/bloom/BloomCacheRedis.php b/includes/cache/bloom/BloomCacheRedis.php
index 212e5e8..4df004a 100644
--- a/includes/cache/bloom/BloomCacheRedis.php
+++ b/includes/cache/bloom/BloomCacheRedis.php
@@ -144,7 +144,7 @@ protected function doAdd( $key, array $members ) {
 
 		-- This uses a variation on:
 		-- 'Less Hashing, Same Performance: Building a Better Bloom Filter'
-		-- http://www.eecs.harvard.edu/~kirsch/pubs/bbbf/esa06.pdf
+		-- https://www.eecs.harvard.edu/~michaelm/postscripts/tr-02-05.pdf
 		local h = { }
 		h[0] = tonumber(string.sub(hash, 1, 8 ), 16)
 		h[1] = tonumber(string.sub(hash, 9, 16), 16)
@@ -249,7 +249,7 @@ protected function doIsHit( $key, $member ) {
 
 		-- This uses a variation on:
 		-- 'Less Hashing, Same Performance: Building a Better Bloom Filter'
-		-- http://www.eecs.harvard.edu/~kirsch/pubs/bbbf/esa06.pdf
+		-- https://www.eecs.harvard.edu/~michaelm/postscripts/tr-02-05.pdf
 		local h = { }
 		h[0] = tonumber(string.sub(hash, 1, 8 ), 16)
 		h[1] = tonumber(string.sub(hash, 9, 16), 16)