diff --git a/lisp/erc/erc-button.el b/lisp/erc/erc-button.el
index 8b13d1cf49c..044776c2363 100644
--- a/lisp/erc/erc-button.el
+++ b/lisp/erc/erc-button.el
@@ -105,18 +105,19 @@ longer than `erc-fill-column'."
   "Flag indicating whether nicks should be buttonized or not."
   :type 'boolean)
 
-(defcustom erc-button-rfc-url "http://www.faqs.org/rfcs/rfc%s.html"
-  "URL used to browse rfc references.
+(defcustom erc-button-rfc-url "https://tools.ietf.org/html/rfc%s"
+  "URL used to browse RFC references.
 %s is replaced by the number."
-  :type 'string)
+  :type 'string
+  :version "28.1")
 
 (define-obsolete-variable-alias 'erc-button-google-url
   'erc-button-search-url "27.1")
 
-(defcustom erc-button-search-url "http://duckduckgo.com/?q=%s"
+(defcustom erc-button-search-url "https://duckduckgo.com/?q=%s"
   "URL used to search for a term.
 %s is replaced by the search string."
-  :version "27.1"
+  :version "28.1"
   :type 'string)
 
 (defcustom erc-button-alist
diff --git a/lisp/erc/erc-capab.el b/lisp/erc/erc-capab.el
index 2028917da0c..19bc2dbb8ec 100644
--- a/lisp/erc/erc-capab.el
+++ b/lisp/erc/erc-capab.el
@@ -40,8 +40,8 @@
 ;; disable this module, it will continue removing message flags, but the
 ;; unidentified nickname prefix will not be added to messages.
 
-;; Visit <http://freenode.net/faq.shtml#spoofing> and
-;; <http://freenode.net/faq.shtml#registering> to find further
+;; Visit <https://freenode.net/kb/answer/cloaks> and
+;; <https://freenode.net/kb/answer/registration> to find further
 ;; explanations of this capability.
 
 ;; From freenode.net's web site (not there anymore) on how to mark
diff --git a/lisp/erc/erc.el b/lisp/erc/erc.el
index bdb1914d7bf..b6dea95bb2b 100644
--- a/lisp/erc/erc.el
+++ b/lisp/erc/erc.el
@@ -3389,7 +3389,7 @@ to send.
 If only one word is given, display the mode of that target.
 
 A list of valid mode strings for Freenode may be found at
-URL `http://freenode.net/using_the_network.shtml'."
+URL `https://freenode.net/kb/all'."
   (cond
    ((string-match "^\\s-\\(.*\\)$" line)
     (let ((s (match-string 1 line)))