diff --git a/README.md b/README.md
index 2363bfd..cd84c37 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Add to the project’s "build.gradle" file:
         mavenCentral()
     }
     dependencies {
-        implementation 'com.github.stephengold:Libbulletjme:21.1.0'
+        implementation 'com.github.stephengold:Libbulletjme:21.2.1'
         implementation 'com.github.stephengold:V-Sport:0.9.0'
     }
 
@@ -78,7 +78,7 @@ Add to the project’s "pom.xml" file:
     <dependency>
       <groupId>com.github.stephengold</groupId>
       <artifactId>Libbulletjme</artifactId>
-      <version>21.1.0</version>
+      <version>21.2.1</version>
     </dependency>
 
     <dependency>
diff --git a/build.gradle b/build.gradle
index 7a9130c..4cb2a3c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ plugins {
 
 ext {
     // current versions of libraries:
-    lbjVersion = '21.1.0'
+    lbjVersion = '21.2.1'
     lwjglVersion = '3.3.3'
     //lwjglVersion = '3.3.4-SNAPSHOT'
     vsportVersion = '0.9.1-SNAPSHOT'