diff --git a/book/pom.xml b/book/pom.xml
index 848c6f5..5b921bd 100644
--- a/book/pom.xml
+++ b/book/pom.xml
@@ -215,7 +215,7 @@ along with ao-messaging-http-client-js.  If not, see <https://www.gnu.org/licens
         <groupId>com.aoapps</groupId><artifactId>ao-io-buffer</artifactId><version>4.1.0${POST-SNAPSHOT}</version>
       </dependency>
       <dependency>
-        <groupId>com.aoapps</groupId><artifactId>ao-lang</artifactId><version>5.3.0${POST-SNAPSHOT}</version>
+        <groupId>com.aoapps</groupId><artifactId>ao-lang</artifactId><version>5.4.0-SNAPSHOT<!-- ${POST-SNAPSHOT} --></version>
       </dependency>
       <dependency>
         <groupId>com.aoapps</groupId><artifactId>ao-net-types</artifactId><version>2.0.2${POST-SNAPSHOT}</version>