diff --git a/docs/pg_bulkload-ja.html b/docs/pg_bulkload-ja.html
index 4186e50..11154f0 100644
--- a/docs/pg_bulkload-ja.html
+++ b/docs/pg_bulkload-ja.html
@@ -802,7 +802,7 @@ <h2 id="requirement">動作環境</h2>
 <dt>PostgreSQLバージョン</dt>
 <dd>PostgreSQL 10, 11, 12, 13, 14, 15</dd>
 <dt>OS</dt>
-<dd>RHEL 7/8</dd>
+<dd>RHEL 7, 8, 9</dd>
 </dl>
 
 <h2 id="releasenote">リリースノート</h2>
diff --git a/docs/pg_bulkload.html b/docs/pg_bulkload.html
index 8f7ced0..9337b84 100644
--- a/docs/pg_bulkload.html
+++ b/docs/pg_bulkload.html
@@ -878,7 +878,7 @@ <h2 id="requirement">Requirements</h2>
 <dt>PostgreSQL versions</dt>
 <dd>PostgreSQL 10, 11, 12, 13, 14, 15</dd>
 <dt>OS</dt>
-<dd>RHEL 7/8</dd>
+<dd>RHEL 7, 8, 9</dd>
 </dl>
 
 <h2 id="releasenote">Release Notes</h2>