diff --git a/http2/ciphers.go b/http2/ciphers.go
index 698860b..c9a0cf3 100644
--- a/http2/ciphers.go
+++ b/http2/ciphers.go
@@ -5,7 +5,7 @@
 package http2
 
 // A list of the possible cipher suite ids. Taken from
-// http://www.iana.org/assignments/tls-parameters/tls-parameters.txt
+// https://www.iana.org/assignments/tls-parameters/tls-parameters.txt
 
 const (
 	cipher_TLS_NULL_WITH_NULL_NULL               uint16 = 0x0000
diff --git a/internal/iana/gen.go b/internal/iana/gen.go
index 86c78b3..2a5c310 100644
--- a/internal/iana/gen.go
+++ b/internal/iana/gen.go
@@ -28,15 +28,15 @@
 	parse func(io.Writer, io.Reader) error
 }{
 	{
-		"http://www.iana.org/assignments/dscp-registry/dscp-registry.xml",
+		"https://www.iana.org/assignments/dscp-registry/dscp-registry.xml",
 		parseDSCPRegistry,
 	},
 	{
-		"http://www.iana.org/assignments/ipv4-tos-byte/ipv4-tos-byte.xml",
+		"https://www.iana.org/assignments/ipv4-tos-byte/ipv4-tos-byte.xml",
 		parseTOSTCByte,
 	},
 	{
-		"http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
+		"https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
 		parseProtocolNumbers,
 	},
 }
diff --git a/ipv4/gen.go b/ipv4/gen.go
index ffb44fe..9d490fa 100644
--- a/ipv4/gen.go
+++ b/ipv4/gen.go
@@ -72,7 +72,7 @@
 	parse func(io.Writer, io.Reader) error
 }{
 	{
-		"http://www.iana.org/assignments/icmp-parameters/icmp-parameters.xml",
+		"https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xml",
 		parseICMPv4Parameters,
 	},
 }
diff --git a/ipv6/gen.go b/ipv6/gen.go
index 41886ec..47b7e9f 100644
--- a/ipv6/gen.go
+++ b/ipv6/gen.go
@@ -72,7 +72,7 @@
 	parse func(io.Writer, io.Reader) error
 }{
 	{
-		"http://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml",
+		"https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml",
 		parseICMPv6Parameters,
 	},
 }