diff --git a/packages/SwingSet/test/snapshots/test-xsnap-store.js.md b/packages/SwingSet/test/snapshots/test-xsnap-store.js.md
index 02a193f1d37..86183fb1dd5 100644
--- a/packages/SwingSet/test/snapshots/test-xsnap-store.js.md
+++ b/packages/SwingSet/test/snapshots/test-xsnap-store.js.md
@@ -10,25 +10,25 @@ Generated by [AVA](https://avajs.dev).
 
     {
       compressSeconds: 0,
-      hash: '8a0e3873976c50462d1b1dac59c912152b0e5cad5eeb9deca0ca64a087b4a873',
+      hash: 'c77e111a40bba743b29cc5bb3abfbd57c1a7143772117cb01da874f5cfe59415',
       rawSaveSeconds: 0,
-      uncompressedSize: 167887,
+      uncompressedSize: 168123,
     }
 
 > after SES boot - sensitive to SES-shim, XS, and supervisor
 
     {
       compressSeconds: 0,
-      hash: 'e1392d787a70c1afe7826d2cc5e2abe8c6615415b79f5fbc76f5eccb7efeff2a',
+      hash: '3a62221548f1d4e9da4961e4fe1cff13f7170c9abfade9171eecfa58d6028c34',
       rawSaveSeconds: 0,
-      uncompressedSize: 775735,
+      uncompressedSize: 777171,
     }
 
 > after use of harden() - sensitive to SES-shim, XS, and supervisor
 
     {
       compressSeconds: 0,
-      hash: '51d8a981b1515c95acb20753df63055930b19095c9566badbfe3f5c254ab6ff4',
+      hash: '2a595ba90b014defb02d02595bc89c1058a5186eab3b8c0ff0dda9d214104543',
       rawSaveSeconds: 0,
-      uncompressedSize: 777887,
+      uncompressedSize: 779331,
     }
diff --git a/packages/SwingSet/test/snapshots/test-xsnap-store.js.snap b/packages/SwingSet/test/snapshots/test-xsnap-store.js.snap
index 86318c1483c..e97e26d0ac2 100644
Binary files a/packages/SwingSet/test/snapshots/test-xsnap-store.js.snap and b/packages/SwingSet/test/snapshots/test-xsnap-store.js.snap differ
diff --git a/packages/xsnap/moddable b/packages/xsnap/moddable
index 547c16c34ac..74aa31cbc46 160000
--- a/packages/xsnap/moddable
+++ b/packages/xsnap/moddable
@@ -1 +1 @@
-Subproject commit 547c16c34ac90f6ae4329d0deeb171f5c99c37b4
+Subproject commit 74aa31cbc464b79133afacbf36bfbb30d6acd2ef
diff --git a/packages/xsnap/test/test-xs-perf.js b/packages/xsnap/test/test-xs-perf.js
index 48bdac41bb0..fc42999a4ef 100644
--- a/packages/xsnap/test/test-xs-perf.js
+++ b/packages/xsnap/test/test-xs-perf.js
@@ -46,7 +46,7 @@ test('meter details', async t => {
 
   t.like(
     meters,
-    { compute: 1_380_187, allocate: 42_074_144 },
+    { compute: 1_380_185, allocate: 42_074_144 },
     'compute, allocate meters should be stable; update METER_TYPE?',
   );
 
@@ -170,7 +170,7 @@ test('metering regex - REDOS', async t => {
   'aaaaaaaaa!'.match(/^(([a-z])+.)+/)
   `);
   const { meterUsage: meters } = result;
-  t.like(meters, { compute: 142 });
+  t.like(meters, { compute: 140 });
 });
 
 test('meter details are still available with no limit', async t => {
diff --git a/packages/xsnap/test/test-xsnap.js b/packages/xsnap/test/test-xsnap.js
index 5189920ebea..7f107431bf4 100644
--- a/packages/xsnap/test/test-xsnap.js
+++ b/packages/xsnap/test/test-xsnap.js
@@ -139,9 +139,10 @@ test('print - start compartment only', async t => {
     }
   `);
   await vat.close();
-  t.deepEqual(
-    ['err:ReferenceError: ?: get print: undefined variable'],
-    opts.messages,
+  t.is(opts.messages.length, 1);
+  t.regex(
+    opts.messages[0],
+    /^err:ReferenceError: [^:]+: get print: undefined variable$/,
   );
 });
 
@@ -159,9 +160,10 @@ test('gc - start compartment only', async t => {
     }
   `);
   await vat.close();
-  t.deepEqual(
-    ['err:ReferenceError: ?: get gc: undefined variable'],
-    opts.messages,
+  t.is(opts.messages.length, 1);
+  t.regex(
+    opts.messages[0],
+    /^err:ReferenceError: [^:]+: get gc: undefined variable$/,
   );
 });
 
diff --git a/packages/xsnap/xsnap-native b/packages/xsnap/xsnap-native
index 0b3869eb79a..2a42752ddca 160000
--- a/packages/xsnap/xsnap-native
+++ b/packages/xsnap/xsnap-native
@@ -1 +1 @@
-Subproject commit 0b3869eb79aa4bd223738bd354324743ac85f3a5
+Subproject commit 2a42752ddcafe8f8b5c4f075c84ddd7dadea606b