diff --git a/bin/README.md b/bin/README.md
index 46b3dead5..0989448a7 100644
--- a/bin/README.md
+++ b/bin/README.md
@@ -556,7 +556,7 @@ the [md2html tool](index.html#md2html).
 
 
 <div id="new_year">
-### [new_year.sh](%%REPO_URL%%/bin/new_year.sh)
+### [new-year.sh](%%REPO_URL%%/bin/new-year.sh)
 </div>
 
 This tool is used my the [Judges](../judges.html) as part of the final
@@ -567,7 +567,7 @@ For example:
 ``` <!---sh-->
     mkdir -p YYYY
     chmod +w .top
-    bin/new_year.sh YYYY
+    bin/new-year.sh YYYY
     chmod -w .top
 ```
 
diff --git a/bin/index.html b/bin/index.html
index 754d292a4..8ef2e5739 100644
--- a/bin/index.html
+++ b/bin/index.html
@@ -705,14 +705,14 @@ page.</p>
 <p>This tool is used in the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/md2html.cfg">bin/md2html.cfg</a> file as part of
 the <a href="index.html#md2html">md2html tool</a>.</p>
 <div id="new_year">
-<h3 id="new_year.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/new_year.sh">new_year.sh</a></h3>
+<h3 id="new-year.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/new-year.sh">new-year.sh</a></h3>
 </div>
 <p>This tool is used my the <a href="../judges.html">Judges</a> as part of the final
 steps to announce a new set of winning IOCCC entries.</p>
 <p>For example:</p>
 <pre><code>    mkdir -p YYYY
     chmod +w .top
-    bin/new_year.sh YYYY
+    bin/new-year.sh YYYY
     chmod -w .top</code></pre>
 <p>Here, <code>YYYY</code> must be a new 4-digit IOCCC year.</p>
 <div id="output-index-inventory">
diff --git a/bin/new_year.sh b/new-year.sh
similarity index 99%
rename from bin/new_year.sh
rename to new-year.sh
index ea7d8011b..d98713e4a 100755
--- a/bin/new_year.sh
+++ b/new-year.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# new_year.sh - add a new IOCCC year
+# new-year.sh - add a new IOCCC year
 #
 # We update .top with a new 4-digit IOCCC year if such a sub-directory exists
 # and the IOCCC year is not already in the .top file.