diff --git a/installer/data/mysql/atomicupdate/bug_42447.pl b/installer/data/mysql/atomicupdate/bug_42447.pl
new file mode 100755
index 0000000000..f5b4d43042
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug_42447.pl
@@ -0,0 +1,37 @@
+use Modern::Perl;
+use Koha::Installer::Output qw(say_warning say_success say_info);
+
+return {
+    bug_number  => "42447",
+    description => "Convert SIP template fields to TEXT",
+    up          => sub {
+        my ($args) = @_;
+        my ( $dbh, $out ) = @$args{qw(dbh out)};
+
+        $dbh->do(
+            q{
+            ALTER TABLE `sip_accounts`
+                MODIFY COLUMN `ae_field_template` TEXT DEFAULT NULL,
+                MODIFY COLUMN `av_field_template` TEXT DEFAULT NULL,
+                MODIFY COLUMN `da_field_template` TEXT DEFAULT NULL
+        }
+        );
+        say_success( $out, "Converted sip_accounts template columns to TEXT" );
+
+        $dbh->do(
+            q{
+            ALTER TABLE `sip_account_custom_item_fields`
+                MODIFY COLUMN `template` TEXT NOT NULL COMMENT 'Template toolkit template'
+        }
+        );
+        say_success( $out, "Converted sip_account_custom_item_fields.template to TEXT" );
+
+        $dbh->do(
+            q{
+            ALTER TABLE `sip_account_custom_patron_fields`
+                MODIFY COLUMN `template` TEXT NOT NULL COMMENT 'Template toolkit template'
+        }
+        );
+        say_success( $out, "Converted sip_account_custom_patron_fields.template to TEXT" );
+    },
+};
diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index b338a34ff0..5860dfcf0a 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -6061,7 +6061,7 @@ CREATE TABLE `sip_account_custom_item_fields` (
   `sip_account_custom_item_field_id` int(11) NOT NULL AUTO_INCREMENT,
   `sip_account_id` int(11) NOT NULL COMMENT 'Foreign key to sip_accounts.sip_account_id',
   `field` varchar(80) NOT NULL COMMENT 'SIP field name e.g. XY',
-  `template` varchar(255) NOT NULL COMMENT 'Template toolkit template name',
+  `template` text NOT NULL COMMENT 'Template toolkit template',
   PRIMARY KEY (`sip_account_custom_item_field_id`),
   UNIQUE KEY `sip_account` (`sip_account_custom_item_field_id`,`sip_account_id`),
   KEY `sip_account_custom_item_fields_ibfk_1` (`sip_account_id`),
@@ -6080,7 +6080,7 @@ CREATE TABLE `sip_account_custom_patron_fields` (
   `sip_account_custom_patron_field_id` int(11) NOT NULL AUTO_INCREMENT,
   `sip_account_id` int(11) NOT NULL COMMENT 'Foreign key to sip_accounts.sip_account_id',
   `field` varchar(80) NOT NULL COMMENT 'SIP field name e.g. XY',
-  `template` varchar(80) NOT NULL COMMENT 'Template toolkit template',
+  `template` text NOT NULL COMMENT 'Template toolkit template',
   PRIMARY KEY (`sip_account_custom_patron_field_id`),
   UNIQUE KEY `sip_account` (`sip_account_custom_patron_field_id`,`sip_account_id`),
   KEY `sip_account_custom_patron_fields_ibfk_1` (`sip_account_id`),
@@ -6192,11 +6192,11 @@ DROP TABLE IF EXISTS `sip_accounts`;
 CREATE TABLE `sip_accounts` (
   `sip_account_id` int(11) NOT NULL AUTO_INCREMENT,
   `sip_institution_id` int(11) NOT NULL COMMENT 'Foreign key to sip_institutions.sip_institution_id',
-  `ae_field_template` varchar(255) DEFAULT NULL,
+  `ae_field_template` text DEFAULT NULL,
   `allow_additional_materials_checkout` tinyint(1) DEFAULT NULL,
   `allow_empty_passwords` tinyint(1) DEFAULT NULL,
   `allow_fields` varchar(255) DEFAULT NULL,
-  `av_field_template` varchar(255) DEFAULT NULL,
+  `av_field_template` text DEFAULT NULL,
   `blocked_item_types` varchar(255) DEFAULT NULL,
   `checked_in_ok` tinyint(1) DEFAULT NULL,
   `convert_nonprinting_characters` varchar(10) DEFAULT NULL,
@@ -6204,7 +6204,7 @@ CREATE TABLE `sip_accounts` (
   `ct_always_send` tinyint(1) DEFAULT NULL,
   `cv_send_00_on_success` tinyint(1) DEFAULT NULL,
   `cv_triggers_alert` tinyint(1) DEFAULT NULL,
-  `da_field_template` varchar(255) DEFAULT NULL,
+  `da_field_template` text DEFAULT NULL,
   `delimiter` varchar(10) DEFAULT '|',
   `disallow_overpayment` tinyint(1) DEFAULT NULL,
   `encoding` varchar(10) DEFAULT NULL,