diff --git a/doc/building.html b/doc/building.html
index a49d7153ba3..70753155312 100644
--- a/doc/building.html
+++ b/doc/building.html
@@ -613,7 +613,7 @@ be accepted by <code>configure</code>.</p>
 <p>To use clang instead of gcc on Linux, use
 <code>--with-toolchain-type=clang</code>.</p>
 <h3 id="apple-xcode">Apple Xcode</h3>
-<p>The oldest supported version of Xcode is 8.</p>
+<p>The oldest supported version of Xcode is 13.0.</p>
 <p>You will need the Xcode command line developer tools to be able to
 build the JDK. (Actually, <em>only</em> the command line tools are
 needed, not the IDE.) The simplest way to install these is to run:</p>
diff --git a/doc/building.md b/doc/building.md
index d60f7e94164..51ac0cad7d9 100644
--- a/doc/building.md
+++ b/doc/building.md
@@ -420,7 +420,7 @@ To use clang instead of gcc on Linux, use `--with-toolchain-type=clang`.
 
 ### Apple Xcode
 
-The oldest supported version of Xcode is 8.
+The oldest supported version of Xcode is 13.0.
 
 You will need the Xcode command line developer tools to be able to build the
 JDK. (Actually, *only* the command line tools are needed, not the IDE.) The