diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 7f44bd2..608b403 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -9,7 +9,7 @@ jme = "3.7.0-beta1.2"
 
 acorus = "com.github.stephengold:Acorus:2.0.0"
 commons-exec = "org.apache.commons:commons-exec:1.3"
-heart = "com.github.stephengold:Heart:9.0.0"
+heart = "com.github.stephengold:Heart:9.1.0"
 jcommander = "com.beust:jcommander:1.82"
 jme3-awt-dialogs = { module = "org.jmonkeyengine:jme3-awt-dialogs", version.ref = "jme" }
 jme3-core = { module = "org.jmonkeyengine:jme3-core", version.ref = "jme" }