diff --git a/build.gradle b/build.gradle
index f6b0e95d..eda1ed97 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,7 +13,7 @@ plugins {
 
 ext {
     group = 'com.github.stephengold'
-    version = '0.3.1-SNAPSHOT'
+    version = '0.3.1'
     baseName = "${artifact}-${version}" // for artifacts
     websiteUrl = 'https://github.com/stephengold/jolt-jni'
 }
diff --git a/release-log.md b/release-log.md
index 15d9945c..b8743e77 100644
--- a/release-log.md
+++ b/release-log.md
@@ -1,5 +1,25 @@
 # release log for the jolt-jni project
 
+## Version 0.3.1 released on TBD
+
++ Bugfix:  memory leak in `MassProperties`
++ Added many methods.
++ Added classes and interfaces to the library:
+  + `BroadPhaseLayerInterface`
+  + `ConstBodyCreationSettings`
+  + `ConstBroadPhaseLayerInterface`
+  + `ConstMassProperties`
+  + `ConstObjectLayerPairFilter`
+  + `ConstObjectVsBroadPhaseLayerFilter`
+  + `EAllowedDofs`
+  + `EOverrideMassProperties`
+  + `Mat44`
+  + `Mat44Arg`
+  + `ObjectLayerPairFilter`
+  + `ObjectVsBroadPhaseLayerFilter`
+  + `UVec4`
+  + `UVec4Arg`
+
 ## Version 0.3.0 released on 16 July 2024
 
 + Added a `java.lang.ref.Cleaner` to automatically free native
diff --git a/src/main/native/glue/Jolt.cpp b/src/main/native/glue/Jolt.cpp
index b6cf5e87..880b4432 100644
--- a/src/main/native/glue/Jolt.cpp
+++ b/src/main/native/glue/Jolt.cpp
@@ -192,6 +192,6 @@ JNIEXPORT void JNICALL Java_com_github_stephengold_joltjni_Jolt_unregisterTypes
  */
 JNIEXPORT jstring JNICALL Java_com_github_stephengold_joltjni_Jolt_versionString
   (JNIEnv *pEnv, jclass) {
-    jstring result = pEnv->NewStringUTF("0.3.1-SNAPSHOT");
+    jstring result = pEnv->NewStringUTF("0.3.1");
     return result;
 }