diff --git a/history.txt b/history.txt
index bfae50f32..3e66bdbf9 100644
--- a/history.txt
+++ b/history.txt
@@ -1,3 +1,17 @@
+2022-08-10 zzz
+ * SSU2: Enable for Android, ARM, and 2% of others
+
+2022-08-06 zzz
+ * GeoIP 2022-08
+ * Router: Hopefully fix clock/job queue deadlock after clock shift
+
+2022-08-05 zzz
+ * SSU: Try to keep a mix of v1/v2 introducers
+
+2022-08-04 zzz
+ * i2ptunnel: New outproxy (new installs only)
+ * SSU2: Block bob's IP in relay response from charlie
+
 2022-08-02 zzz
  * SSU2: More Path challenge WIP
 
diff --git a/router/java/src/net/i2p/router/RouterVersion.java b/router/java/src/net/i2p/router/RouterVersion.java
index 2f628a65d..b9f86d25e 100644
--- a/router/java/src/net/i2p/router/RouterVersion.java
+++ b/router/java/src/net/i2p/router/RouterVersion.java
@@ -18,10 +18,10 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Git";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 14;
+    public final static long BUILD = 15;
 
     /** for example "-test" */
-    public final static String EXTRA = "";
+    public final static String EXTRA = "-rc";
     public final static String FULL_VERSION = VERSION + "-" + BUILD + EXTRA;
     public static void main(String args[]) {
         System.out.println("I2P Router version: " + FULL_VERSION);
diff --git a/router/java/src/net/i2p/router/transport/TransportManager.java b/router/java/src/net/i2p/router/transport/TransportManager.java
index 7b1a0da1a..795fd649b 100644
--- a/router/java/src/net/i2p/router/transport/TransportManager.java
+++ b/router/java/src/net/i2p/router/transport/TransportManager.java
@@ -87,6 +87,8 @@ public class TransportManager implements TransportEventListener {
      * @since 0.9.54
      */
     public final static String PROP_ENABLE_SSU2 = "i2np.ssu2.enable";
+    /** 1 in this many */
+    private static final int SSU2_ENABLE_PROBABILITY = 50;
     /** default true */
     public final static String PROP_ENABLE_NTCP = "i2np.ntcp.enable";
     /** default true */
@@ -259,7 +261,18 @@ public class TransportManager implements TransportEventListener {
     private void configTransports() {
         Transport udp = null;
         if (_enableUDP) {
-            X25519KeyFactory xdh = _context.getBooleanProperty(PROP_ENABLE_SSU2) ? _xdhThread : null;
+            String ssu2 = _context.getProperty(PROP_ENABLE_SSU2);
+            boolean enableSSU2 = false;
+            if (ssu2 == null) {
+                // Migration, to be removed when we change to default true
+                if (SystemVersion.isSlow() || _context.random().nextInt(SSU2_ENABLE_PROBABILITY) == 0) {
+                    enableSSU2 = true;
+                    _context.router().saveConfig(PROP_ENABLE_SSU2, "true");
+                }
+            } else {
+                enableSSU2 = Boolean.parseBoolean(ssu2);
+            }
+            X25519KeyFactory xdh = enableSSU2 ? _xdhThread : null;
             udp = new UDPTransport(_context, _dhThread, xdh);
             addTransport(udp);
             initializeAddress(udp);