diff --git a/HeartExamples/build.gradle b/HeartExamples/build.gradle
index 58eb864..d3bb179 100644
--- a/HeartExamples/build.gradle
+++ b/HeartExamples/build.gradle
@@ -14,19 +14,19 @@ if (!hasProperty('mainClass')) {
 jar.manifest.attributes('Main-Class': 'jme3utilities.test.AppChooser')
 
 dependencies {
-    implementation 'org.apache.commons:commons-exec:1.3'
-    implementation ('com.github.stephengold:Acorus:2.0.0') {
+    implementation(libs.commons.exec)
+    implementation(libs.acorus) {
         exclude group: 'com.github.stephengold', module: 'Heart'
     }
-    runtimeOnly 'org.jmonkeyengine:jme3-desktop:' + jme3Version
-    runtimeOnly 'org.jmonkeyengine:jme3-effects:' + jme3Version
-    runtimeOnly 'org.jmonkeyengine:jme3-lwjgl3:' + jme3Version
-    runtimeOnly 'org.jmonkeyengine:jme3-testdata:' + jme3Version // for Jaime
+    runtimeOnly(libs.jme3.desktop)
+    runtimeOnly(libs.jme3.effects)
+    runtimeOnly(libs.jme3.lwjgl3)
+    runtimeOnly(libs.jme3.testdata) // for Jaime
 
     // HeartExamples doesn't use jme3-jogg nor jme3-plugins
     //  -- they are included solely to avoid warnings from AssetConfig.
-    runtimeOnly 'org.jmonkeyengine:jme3-jogg:' + jme3Version
-    runtimeOnly 'org.jmonkeyengine:jme3-plugins:' + jme3Version
+    runtimeOnly(libs.jme3.jogg)
+    runtimeOnly(libs.jme3.plugins)
 
     //implementation 'com.github.stephengold:Heart:' + heartVersion // for published library
     implementation project(':HeartLibrary') // for local library build
diff --git a/HeartLibrary/build.gradle b/HeartLibrary/build.gradle
index 50b1f51..d30feaa 100644
--- a/HeartLibrary/build.gradle
+++ b/HeartLibrary/build.gradle
@@ -19,11 +19,11 @@ ext {
 }
 
 dependencies {
-    api 'org.jmonkeyengine:jme3-core:' + jme3Version
+    api(libs.jme3.core)
 
-    testImplementation 'junit:junit:4.13.2'
-    testImplementation 'org.jmonkeyengine:jme3-desktop:' + jme3Version
-    testRuntimeOnly 'org.jmonkeyengine:jme3-testdata:' + jme3Version
+    testImplementation(libs.junit)
+    testImplementation(libs.jme3.desktop)
+    testImplementation(libs.jme3.testdata)
 }
 
 // Register publishing tasks:
diff --git a/J3oDump/build.gradle b/J3oDump/build.gradle
index 6f5273f..42692dd 100644
--- a/J3oDump/build.gradle
+++ b/J3oDump/build.gradle
@@ -24,8 +24,8 @@ tasks.register('j3odump', JavaExec) {
 }
 
 dependencies {
-    implementation 'org.jmonkeyengine:jme3-desktop:' + jme3Version
-    implementation 'org.jmonkeyengine:jme3-plugins:' + jme3Version
+    implementation(libs.jme3.desktop)
+    implementation(libs.jme3.plugins)
 
     //implementation 'com.github.stephengold:Heart:' + heartVersion // for published library
     implementation project(':HeartLibrary') // for latest sourcecode
diff --git a/build.gradle b/build.gradle
index 0fd19d6..4f6bb80 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,9 +7,6 @@ plugins {
 ext {
     jmeTarget = '' // distinguish non-JME libraries built for specific JME releases
 
-    // current version of the JMonkeyEngine libraries:
-    jme3Version = '3.7.0-beta1'
-
     heartSnapshot = '-SNAPSHOT' // for development builds
     //heartSnapshot = '' // for release builds
     heartVersion = '9.0.1' + jmeTarget
diff --git a/common.gradle b/common.gradle
index 913903d..0b5028c 100644
--- a/common.gradle
+++ b/common.gradle
@@ -9,7 +9,7 @@ java {
 }
 
 checkstyle {
-    toolVersion '9.3'
+    toolVersion libs.versions.checkstyle.get()
 }
 
 tasks.withType(JavaCompile).configureEach { // Java compile-time options:
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
new file mode 100644
index 0000000..3ebbd97
--- /dev/null
+++ b/gradle/libs.versions.toml
@@ -0,0 +1,19 @@
+## TOML version catalog for the Heart project
+
+[versions]
+checkstyle = "9.3"
+jme = "3.7.0-beta1"
+
+[libraries]
+acorus = { module = "com.github.stephengold:Acorus", version = "2.0.0" }
+commons-exec = { module = "org.apache.commons:commons-exec", version = "1.3" }
+jme3-core = { module = "org.jmonkeyengine:jme3-core", version.ref = "jme" }
+jme3-desktop = { module = "org.jmonkeyengine:jme3-desktop", version.ref = "jme" }
+jme3-effects = { module = "org.jmonkeyengine:jme3-effects", version.ref = "jme" }
+jme3-jogg = { module = "org.jmonkeyengine:jme3-jogg", version.ref = "jme" }
+jme3-lwjgl3 = { module = "org.jmonkeyengine:jme3-lwjgl3", version.ref = "jme" }
+jme3-plugins = { module = "org.jmonkeyengine:jme3-plugins", version.ref = "jme" }
+jme3-testdata = { module = "org.jmonkeyengine:jme3-testdata", version.ref = "jme" }
+junit = { module = "junit:junit", version = "4.13.2" }
+
+[plugins]