diff --git a/bin/OpenSim.Region.PhysicsModule.BulletS.dll.config b/bin/OpenSim.Region.PhysicsModule.BulletS.dll.config
index 201a87146e..20914e5426 100755
--- a/bin/OpenSim.Region.PhysicsModule.BulletS.dll.config
+++ b/bin/OpenSim.Region.PhysicsModule.BulletS.dll.config
@@ -1,6 +1,6 @@
 <configuration>
   <dllmap os="windows" cpu="x86-64" dll="BulletSim" target="lib64/BulletSim-3.26-20231207-x86_64.dll" />
   <dllmap os="osx" dll="BulletSim" target="lib64/libBulletSim.dylib" />
-  <dllmap os="!windows,osx" cpu="x86-64" dll="BulletSim" target="lib64/libBulletSim-3.26-20231207-x86_64.so" />
+  <dllmap os="!windows,osx" cpu="x86-64" dll="BulletSim" target="lib64/libBulletSim-2.86-20170903-x86_64.so" />
   <dllmap os="!windows,osx" cpu="arm64" dll="BulletSim" target="lib64/libBulletSim-arm64.so" />
 </configuration>
diff --git a/bin/lib64/libBulletSim.so b/bin/lib64/libBulletSim.so
index 5633315daa..2bf11596fe 100755
Binary files a/bin/lib64/libBulletSim.so and b/bin/lib64/libBulletSim.so differ