diff --git a/WORKSPACE b/WORKSPACE
index 0c55d21..b1bedac 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -140,8 +140,8 @@
 
 maven_jar(
     name = "soy",
-    artifact = "com.google.template:soy:2022-07-20",
-    sha1 = "f64eb90da6d91beddf11653865c90f26d26710cf",
+    artifact = "com.google.template:soy:2023-09-13",
+    sha1 = "b88a029df7408c58452f80d6518723f1386d69b5",
 )
 
 FLOGGER_VERS = "0.7.4"
diff --git a/resources/com/google/gitiles/templates/Common.soy b/resources/com/google/gitiles/templates/Common.soy
index c38f727..c5fb238 100644
--- a/resources/com/google/gitiles/templates/Common.soy
+++ b/resources/com/google/gitiles/templates/Common.soy
@@ -49,13 +49,13 @@
       <link rel="stylesheet" type="text/css" href="{$url}">
     {/for}
   {/if}
-  {delcall gitiles.customHeadTagPart variant="$customVariant ?: ''" /}
+  {call customHeadTagPart variant="'' + ($customVariant ?? '')" /}
 
 </head>
 <body class="Site">
   <header class="Site-header">
     <div class="Header">
-      {delcall gitiles.customHeader variant="$customVariant ?: ''" /}
+      {call customHeader variant="'' + ($customVariant ?? '')" /}
 
       {if $menuEntries and length($menuEntries)}
         <div class="Header-menu">
@@ -95,14 +95,14 @@
  * This can be used to include per-project CSS/JS by
  * providing custom variants.
  */
-{deltemplate gitiles.customHeadTagPart}
+{template customHeadTagPart modifiable="true" legacydeltemplatenamespace="gitiles.customHeadTagPart" usevarianttype="string"}
   <!-- default customHeadTagPart -->
-{/deltemplate}
+{/template}
 
 /**
  * Default custom header implementation for Gitiles.
  */
-{deltemplate gitiles.customHeader}
+{template customHeader modifiable="true" legacydeltemplatenamespace="gitiles.customHeader" usevarianttype="string"}
   {@inject SITE_TITLE: string}
 <!-- default customHeader -->
 <div class="Header-title">
@@ -110,44 +110,44 @@
     {$SITE_TITLE}
   {/msg}
 </div>
-{/deltemplate}
+{/template}
 
 /**
  * Footer 'powered by' element
  *
  * Please call this in custom variants as well.
  */
-{deltemplate gitiles.footerPoweredBy}
+{template footerPoweredBy modifiable="true" legacydeltemplatenamespace="gitiles.footerPoweredBy"}
 <span class="Footer-poweredBy">
   Powered by <a href="https://gerrit.googlesource.com/gitiles/">Gitiles</a>
 </span>
-{/deltemplate}
+{/template}
 
 /**
  * Footer format badge
  *
  * You can use this in custom footers as well.
  */
-{deltemplate gitiles.footerFormatBadge}
+{template footerFormatBadge modifiable="true" legacydeltemplatenamespace="gitiles.footerFormatBadge"}
 <span class="Footer-formats">
   <a class="u-monospace Footer-formatsItem" href="?format=TEXT">{msg desc="text format"}txt{/msg}</a>
     {sp}
   <a class="u-monospace Footer-formatsItem" href="?format=JSON">{msg desc="JSON format"}json{/msg}</a>
 </span>
-{/deltemplate}
+{/template}
 
 /**
  * Default Footer
  */
-{deltemplate gitiles.customFooter}
+{template customFooter modifiable="true" legacydeltemplatenamespace="gitiles.customFooter" usevarianttype="string"}
 <!-- default customFooter -->
 <footer class="Site-footer">
   <div class="Footer">
-   {delcall gitiles.footerPoweredBy /}
-   {delcall gitiles.footerFormatBadge /}
+    {call footerPoweredBy /}
+    {call footerFormatBadge /}
   </div>
 </footer>
-{/deltemplate}
+{/template}
 
 /**
  * Main footer.
@@ -159,7 +159,7 @@
   {@param? customVariant: ?}  /** variant name for custom styling. */
     </div> <!-- Container -->
   </div> <!-- Site-content -->
-  {delcall gitiles.customFooter variant="$customVariant ?: ''" /}
+  {call customFooter variant="'' + ($customVariant ?? '')" /}
 </body>
 </html>
 {/template}
diff --git a/resources/com/google/gitiles/templates/Doc.soy b/resources/com/google/gitiles/templates/Doc.soy
index db46994..ac32006 100644
--- a/resources/com/google/gitiles/templates/Doc.soy
+++ b/resources/com/google/gitiles/templates/Doc.soy
@@ -18,14 +18,14 @@
 /**
  * Default Doc Footer
  */
-{deltemplate gitiles.customDocFooter}
+{template customDocFooter modifiable="true" legacydeltemplatenamespace="gitiles.customDocFooter" usevarianttype="string"}
   {@param? sourceUrl: ?}  /** url for source view of the page. */
   {@param? logUrl: ?}  /** url for log history of page. */
   {@param? blameUrl: ?}  /** url for blame of page source. */
 <!-- default customDocFooter -->
 <footer class="Site-footer">
   <div class="Footer">
-    {delcall gitiles.footerPoweredBy /}
+    {call common.footerPoweredBy /}
     <div class="Footer-links">
       {if $sourceUrl}<a class="Footer-link" href="{$sourceUrl}">{msg desc="text for the source link"}source{/msg}</a>{/if}
       {if $logUrl}<a class="Footer-link" href="{$logUrl}">{msg desc="text for the log link"}log{/msg}</a>{/if}
@@ -33,7 +33,7 @@
     </div>
   </div>
 </footer>
-{/deltemplate}
+{/template}
 
 /**
  * Documentation page rendered from markdown.
@@ -59,7 +59,7 @@
   <link rel="stylesheet" type="text/css" href="{$staticUrls.BASE_CSS_URL}" />
   <link rel="stylesheet" type="text/css" href="{$staticUrls.DOC_CSS_URL}" />
   <link rel="stylesheet" type="text/css" href="{$staticUrls.PRETTIFY_CSS_URL}" />
-  {delcall gitiles.customHeadTagPart variant="$customVariant ?: ''" /}
+  {call common.customHeadTagPart variant="'' + ($customVariant ?? '')" /}
 </head>
 <body class="Site">
   <header class="Site-header {if $navbarHtml}Site-header--withNavbar{/if}">
@@ -84,7 +84,7 @@
       </div>
     </div>
   </div>
-  {delcall gitiles.customDocFooter variant="$customVariant ?: ''" /}
+  {call customDocFooter variant="'' + ($customVariant ?? '')" /}
   {if $analyticsId}
     /* From https://developers.google.com/analytics/devguides/collection/analyticsjs/ */
     <script>
diff --git a/resources/com/google/gitiles/templates/LogDetail.soy b/resources/com/google/gitiles/templates/LogDetail.soy
index 23ae8eb..13dc7c0 100644
--- a/resources/com/google/gitiles/templates/LogDetail.soy
+++ b/resources/com/google/gitiles/templates/LogDetail.soy
@@ -62,10 +62,10 @@
  * Wrapper for a single log entry with pretty format and variant.
  */
 {template logEntryWrapper}
-  {@param variant: ?}  /** variant name for log entry template. */
+  {@param variant: string}  /** variant name for log entry template. */
   {@param entry: ?}  /** log entry; see .logEntry. */
 <li class="CommitLog-item CommitLog-item--{$variant}">
-  {delcall gitiles.logEntry variant="$variant ?: 'default'" data="$entry" /}
+  {call logEntry variant="$variant" data="$entry" /}
 </li>
 {/template}
 
@@ -84,7 +84,6 @@
 {/if}
 {/template}
 
-
 /**
  * Single log entry indicating the full log is empty.
  */
@@ -92,11 +91,10 @@
 <li class="CommitLog-item CommitLog-item--empty">{msg desc="informational text for when the log is empty"}No commits.{/msg}</li>
 {/template}
 
-
 /**
  * Single pretty log entry, similar to --pretty=oneline.
  */
-{deltemplate gitiles.logEntry variant="'oneline'"}
+{template oneLineLogEntry visibility="private" modifies="logEntry" variant="'oneline'"}
   {@param abbrevSha: ?}  /** abbreviated SHA-1. */
   {@param sha: ?}  /** commit SHA-1. */
   {@param url: ?}  /** URL to commit detail page. */
@@ -147,13 +145,13 @@
   </span>
 {/if}
 
-{/deltemplate}
+{/template}
 
 
 /**
  * Default single log entry (oneline format).
  */
-{deltemplate gitiles.logEntry variant="'default'"}
+{template logEntry modifiable="true" legacydeltemplatenamespace="gitiles.LogEntry" usevarianttype="string"}
   {@param abbrevSha: ?}  /** abbreviated SHA-1. */
   {@param sha: ?}  /** commit SHA-1. */
   {@param url: ?}  /** URL to commit detail page. */
@@ -173,14 +171,14 @@
       newPath: the new path after the rename or copy.
       score: the similarity score of the rename or copy.
       */
-{delcall gitiles.logEntry variant="'oneline'" data="all" /}
-{/deltemplate}
+  {call logEntry variant="'oneline'" data="all" /}
+{/template}
 
 
 /**
  * Single pretty log entry, similar to --pretty=full.
  */
-{deltemplate gitiles.logEntry variant="'full'"}
+{template fullLogEntry visibility="private" modifies="logEntry" variant="'full'"}
   {@param abbrevSha: ?}  /** abbreviated SHA-1. */
   {@param sha: ?}  /** commit SHA-1. */
   {@param url: ?}  /** URL to commit detail page. */
@@ -236,7 +234,6 @@
     </td>
     <td>{$committer.time}</td>
   </tr>
-
   {if $rename}
     <tr>
       <td colspan="3">
@@ -262,4 +259,4 @@
 <pre class="u-pre u-monospace MetadataMessage">
   {$message}
 </pre>
-{/deltemplate}
+{/template}