diff --git a/README.md b/README.md
index 083df28..009b734 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![build](https://github.com/chrovis/clj-hgvs/actions/workflows/build.yml/badge.svg)](https://github.com/chrovis/clj-hgvs/actions/workflows/build.yml)
 [![codecov](https://codecov.io/gh/chrovis/clj-hgvs/branch/master/graph/badge.svg)](https://codecov.io/gh/chrovis/clj-hgvs)
 
-Clojure(Script) library for handling [HGVS](http://varnomen.hgvs.org/).
+Clojure(Script) library for handling [HGVS](https://hgvs-nomenclature.org/).
 
 ## Features
 
diff --git a/src/clj_hgvs/core.cljc b/src/clj_hgvs/core.cljc
index 6060556..e6e31f4 100644
--- a/src/clj_hgvs/core.cljc
+++ b/src/clj_hgvs/core.cljc
@@ -1,5 +1,5 @@
 (ns clj-hgvs.core
-  "Main functions for handling HGVS. See http://varnomen.hgvs.org/ for the
+  "Main functions for handling HGVS. See https://hgvs-nomenclature.org/ for the
   detail HGVS nomenclature."
   (:refer-clojure :exclude [== #?(:clj format)])
   (:require #?(:clj [clojure.pprint :as pp])
diff --git a/src/clj_hgvs/mutation.cljc b/src/clj_hgvs/mutation.cljc
index af01791..89e1b54 100644
--- a/src/clj_hgvs/mutation.cljc
+++ b/src/clj_hgvs/mutation.cljc
@@ -221,7 +221,7 @@
 
 ;;; DNA mutations
 
-;; See http://varnomen.hgvs.org/bg-material/standards#dna
+;; See https://hgvs-nomenclature.org/stable/background/standards/#dna
 (s/def ::dna-bases
   (s/and string? #(re-matches #"[ACGTBDHKMNRSVWY]+" %)))
 
@@ -879,7 +879,7 @@
 
 ;;; RNA mutations
 
-;; See http://varnomen.hgvs.org/bg-material/standards#rna
+;; See https://hgvs-nomenclature.org/stable/background/standards/#rna
 (s/def ::rna-bases
   (s/and string? #(re-matches #"[acgubdhkmnrsvwy]+" %)))