diff --git a/stdnum/cz/bankaccount.py b/stdnum/cz/bankaccount.py
index 76169a65..a802642d 100644
--- a/stdnum/cz/bankaccount.py
+++ b/stdnum/cz/bankaccount.py
@@ -30,7 +30,7 @@
 More information:
 
 * https://www.penize.cz/osobni-ucty/424173-tajemstvi-cisla-uctu-klicem-pro-banky-je-11
-* http://www.zlatakoruna.info/zpravy/ucty/cislo-uctu-v-cr
+* https://www.zlatakoruna.info/zpravy/ucty/cislo-uctu-v-cr
 
 >>> validate('34278-0727558021/0100')
 '034278-0727558021/0100'
diff --git a/stdnum/es/referenciacatastral.py b/stdnum/es/referenciacatastral.py
index 8d5ee1fb..2d8cafad 100644
--- a/stdnum/es/referenciacatastral.py
+++ b/stdnum/es/referenciacatastral.py
@@ -32,8 +32,8 @@
 
 More information:
 
-* http://www.catastro.meh.es/esp/referencia_catastral_1.asp (Spanish)
-* http://www.catastro.meh.es/documentos/05042010_P.pdf (Spanish)
+* https://www.catastro.meh.es/ (Spanish)
+* https://www.catastro.meh.es/documentos/05042010_P.pdf (Spanish)
 * https://es.wikipedia.org/wiki/Catastro#Referencia_catastral
 
 >>> validate('7837301-VG8173B-0001 TT')  # Lanteira town hall
diff --git a/stdnum/lei.py b/stdnum/lei.py
index 376fd476..057404b5 100644
--- a/stdnum/lei.py
+++ b/stdnum/lei.py
@@ -28,7 +28,7 @@
 More information:
 
 * https://en.wikipedia.org/wiki/Legal_Entity_Identifier
-* http://www.lei-lookup.com/
+* https://www.lei-lookup.com/
 * https://www.gleif.org/
 * http://openleis.com/
 
diff --git a/stdnum/nl/bsn.py b/stdnum/nl/bsn.py
index c3b35839..41047e4b 100644
--- a/stdnum/nl/bsn.py
+++ b/stdnum/nl/bsn.py
@@ -28,7 +28,7 @@
 
 * https://en.wikipedia.org/wiki/National_identification_number#Netherlands
 * https://nl.wikipedia.org/wiki/Burgerservicenummer
-* http://www.burgerservicenummer.nl/
+* https://www.burgerservicenummer.nl/
 
 >>> validate('1112.22.333')
 '111222333'