diff --git a/INSTALL.d/Dockerfile b/INSTALL.d/Dockerfile
index 8ce619f..87b9054 100644
--- a/INSTALL.d/Dockerfile
+++ b/INSTALL.d/Dockerfile
@@ -57,7 +57,6 @@ RUN set -xe && \
   libfile-tail-perl \
   libio-compress-perl \
   libio-socket-ssl-perl \
-  libio-socket-inet6-perl \
   libio-tee-perl \
   libhtml-parser-perl \
   libjson-webtoken-perl \
diff --git a/INSTALL.d/INSTALL.AWS_EC2.txt b/INSTALL.d/INSTALL.AWS_EC2.txt
index 813ad0a..6298498 100644
--- a/INSTALL.d/INSTALL.AWS_EC2.txt
+++ b/INSTALL.d/INSTALL.AWS_EC2.txt
@@ -72,7 +72,6 @@ perl-Dist-CheckConflicts \
 perl-ExtUtils-Embed      \
 perl-File-Copy-Recursive \
 perl-File-Tail       \
-perl-IO-Socket-INET6 \
 perl-IO-Socket-SSL   \
 perl-JSON            \
 perl-HTML-Parser     \
diff --git a/INSTALL.d/INSTALL.ArchLinux.txt b/INSTALL.d/INSTALL.ArchLinux.txt
index db09be9..aeae0eb 100644
--- a/INSTALL.d/INSTALL.ArchLinux.txt
+++ b/INSTALL.d/INSTALL.ArchLinux.txt
@@ -48,7 +48,6 @@ Commands to run:
    extra/perl-digest-hmac \
    community/perl-dist-checkconflicts \
    extra/perl-file-copy-recursive \
-   extra/perl-io-socket-inet6 \
    extra/perl-io-socket-ssl \
    community/perl-io-tee \
    community/perl-json \
diff --git a/INSTALL.d/INSTALL.Debian.txt b/INSTALL.d/INSTALL.Debian.txt
index 45d6767..8341441 100644
--- a/INSTALL.d/INSTALL.Debian.txt
+++ b/INSTALL.d/INSTALL.Debian.txt
@@ -80,7 +80,6 @@ apt install -y            \
   libencode-imaputf7-perl     \
   libfile-copy-recursive-perl \
   libfile-tail-perl        \
-  libio-socket-inet6-perl  \
   libio-socket-ssl-perl    \
   libio-tee-perl           \
   libhtml-parser-perl      \
@@ -170,7 +169,6 @@ apt install           \
   libencode-imaputf7-perl     \
   libfile-copy-recursive-perl \
   libfile-tail-perl        \
-  libio-socket-inet6-perl  \
   libio-socket-ssl-perl    \
   libio-tee-perl           \
   libhtml-parser-perl      \
@@ -245,7 +243,6 @@ apt-get install    \
   libfile-copy-recursive-perl \
   libfile-tail-perl        \
   libio-compress-perl     \
-  libio-socket-inet6-perl \
   libio-socket-ssl-perl   \
   libio-tee-perl          \
   libmail-imapclient-perl \
diff --git a/INSTALL.d/INSTALL.Docker_build.txt b/INSTALL.d/INSTALL.Docker_build.txt
index 9d332c5..8afba9b 100644
--- a/INSTALL.d/INSTALL.Docker_build.txt
+++ b/INSTALL.d/INSTALL.Docker_build.txt
@@ -70,7 +70,6 @@ RUN set -xe && \
   libfile-tail-perl \
   libio-compress-perl \
   libio-socket-ssl-perl \
-  libio-socket-inet6-perl \
   libio-tee-perl \
   libhtml-parser-perl \
   libjson-webtoken-perl \
diff --git a/INSTALL.d/INSTALL.Ubuntu.txt b/INSTALL.d/INSTALL.Ubuntu.txt
index 1c1ca43..c32742a 100644
--- a/INSTALL.d/INSTALL.Ubuntu.txt
+++ b/INSTALL.d/INSTALL.Ubuntu.txt
@@ -26,7 +26,6 @@ libencode-imaputf7-perl     \
 libfile-copy-recursive-perl \
 libfile-tail-perl       \
 libio-compress-perl     \
-libio-socket-inet6-perl \
 libio-socket-ssl-perl   \
 libio-tee-perl          \
 libjson-webtoken-perl   \
diff --git a/INSTALL.d/prerequisites_imapsync b/INSTALL.d/prerequisites_imapsync
index 34be2dd..2ced19c 100755
--- a/INSTALL.d/prerequisites_imapsync
+++ b/INSTALL.d/prerequisites_imapsync
@@ -20,7 +20,6 @@ Encode::IMAPUTF7
 File::Copy::Recursive
 File::Tail
 IO::Socket::INET
-IO::Socket::INET6
 IO::Socket::SSL
 IO::Tee
 JSON
diff --git a/Makefile b/Makefile
index 36a3919..bb857ef 100644
--- a/Makefile
+++ b/Makefile
@@ -716,7 +716,7 @@ $(BIN_NAME): imapsync
 	imapsync ; \
 	}
 	# Maybe add -M Test2::Event::Info Mail::IMAPClient \
-	#-M Net::SSLeay -M IO::Socket -M IO::Socket::INET6 -M IO::Socket::SSL \
+	#-M Net::SSLeay -M IO::Socket -M IO::Socket::SSL \
 	#-M Digest::MD5 -M Digest::HMAC_MD5 -M Term::ReadKey \
 	#-M Authen::NTLM -M HTML::Entities -M JSON::WebToken \
 	#-M Test2::Event -M Test2::Formatter -M Test2::Formatter::TAP \
diff --git a/imapsync b/imapsync
index e3f3363..51b77cc 100755
--- a/imapsync
+++ b/imapsync
@@ -1001,7 +1001,6 @@ use File::stat ;
 use Getopt::Long (  ) ;
 use IO::File ;
 use IO::Socket qw( :crlf SOL_SOCKET SO_KEEPALIVE ) ;
-use IO::Socket::INET6 ;
 use IO::Socket::SSL ;
 use IO::Tee ;
 use IPC::Open3 'open3' ;
@@ -7075,7 +7074,6 @@ sub modulesversion
                 'HTML::Entities'        => sub { $HTML::Entities::VERSION },
                 'IO::Socket'            => sub { $IO::Socket::VERSION },
                 'IO::Socket::INET'      => sub { $IO::Socket::INET::VERSION },
-                'IO::Socket::INET6'     => sub { $IO::Socket::INET6::VERSION },
                 'IO::Socket::IP'        => sub { $IO::Socket::IP::VERSION },
                 'IO::Socket::SSL'       => sub { $IO::Socket::SSL::VERSION },
                 'IO::Tee'               => sub { $IO::Tee::VERSION },
@@ -7870,13 +7868,14 @@ sub tests_connect_socket
                         skip( 'Tests avoided on CUILLERE/pcHPDV7-HP/macosx.polarhome.com/docker cannot do ipv6', 2 ) ;
                 }
 
-                $socket = IO::Socket::INET6->new(
-                        PeerAddr => 'ks6ipv6.lamiral.info',
+                $socket = IO::Socket::IP->new(
+                        PeerHost => 'ks6ipv6.lamiral.info',
                         PeerPort => 143,
+                        V6Only => 1,
                 ) ;
 
 
-                ok( $imap = connect_socket( $socket ), 'connect_socket: ks6ipv6.lamiral.info port 143 IO::Socket::INET6' ) ;
+                ok( $imap = connect_socket( $socket ), 'connect_socket: ks6ipv6.lamiral.info port 143 IO::Socket::IP' ) ;
                 #$imap->Debug( 1 ) ;
                 # myprint( $imap->capability(  ) ) ;
                 if ( $imap ) {