diff --git a/appveyor.yml b/appveyor.yml
index 265e5c26..99a0de51 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,7 +1,7 @@
 ---
 # configure deployment by AppVeyor.com
 
-version: 12.4.0
+version: 12.4.1
 
 image: Visual Studio 2019
 
@@ -11,13 +11,13 @@ build_script:
   - cmd: gradlew.bat build --console=plain --no-daemon
 
 artifacts:
-  - path: dist/Libbulletjme-12.4.0.jar
+  - path: dist/Libbulletjme-12.4.1.jar
     name: classJar
-  - path: dist/Libbulletjme-12.4.0-javadoc.jar
+  - path: dist/Libbulletjme-12.4.1-javadoc.jar
     name: javadocJar
-  - path: dist/Libbulletjme-12.4.0-sources.jar
+  - path: dist/Libbulletjme-12.4.1-sources.jar
     name: sourcesJar
-  - path: dist/Libbulletjme-12.4.0.pom
+  - path: dist/Libbulletjme-12.4.1.pom
     name: pom
   - path: dist/Windows32DebugDp_bulletjme.dll
     name: dll32DD
diff --git a/build.gradle b/build.gradle
index b620bfdd..0c921790 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ plugins {
 ext {
     group = 'com.github.stephengold'
     artifact = 'Libbulletjme'
-    version = '12.4.0'
+    version = '12.4.1'
     baseName = "${artifact}-${version}"
     websiteUrl = 'https://github.com/stephengold/Libbulletjme'
 }
diff --git a/release-notes.md b/release-notes.md
index 0e91d679..2e312f55 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,6 +1,6 @@
 # Release log for the Libbulletjme project
 
-## Version 12.4.0 released on 24 October 2021
+## Version 12.4.1 released on 25 October 2021
 
  + Bugfix: `SphereTriangleDetector` doesn't account for the triangle's margin
  + NativePhysicsObject:  make all NPOs comparable (for use in collections)
diff --git a/src/main/native/glue/jmeClasses.h b/src/main/native/glue/jmeClasses.h
index f368d4fa..12bb1b03 100644
--- a/src/main/native/glue/jmeClasses.h
+++ b/src/main/native/glue/jmeClasses.h
@@ -38,7 +38,7 @@
 
 #include <jni.h>
 
-#define LIBBULLETJME_VERSION "12.4.0"
+#define LIBBULLETJME_VERSION "12.4.1"
 
 #ifdef _DEBUG
 #define NULL_CHK(pEnv, pointer, message, retval) \