diff --git a/INSTALL.d/Dockerfile b/INSTALL.d/Dockerfile
index 9b5eaf5..8cc9f85 100644
--- a/INSTALL.d/Dockerfile
+++ b/INSTALL.d/Dockerfile
@@ -56,7 +56,6 @@ 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 ff43dad..25fc8ba 100644
--- a/INSTALL.d/INSTALL.Debian.txt
+++ b/INSTALL.d/INSTALL.Debian.txt
@@ -74,7 +74,6 @@ 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      \
@@ -164,7 +163,6 @@ 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      \
@@ -239,7 +237,6 @@ 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 \