diff --git a/third_party/test262/test/built-ins/Number/MAX_VALUE/value.js b/third_party/test262/test/built-ins/Number/MAX_VALUE/value.js
new file mode 100644
index 00000000000000..82f46335d7bea0
--- /dev/null
+++ b/third_party/test262/test/built-ins/Number/MAX_VALUE/value.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2026 Luna Pfeiffer. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-number.max_value
+description: >
+  Number.MAX_VALUE is approximately 1.7976931348623157 × 10³⁰⁸
+
+---*/
+
+
+assert.sameValue(typeof Number.MAX_VALUE, "number", "Number.MAX_VALUE should be a number");
+assert(Number.MAX_VALUE > 0, "Number.MAX_VALUE must be positive");
+
+assert(Number.MAX_VALUE > Number.MAX_SAFE_INTEGER, "Number.MAX_VALUE should be larger than Number.MAX_SAFE_INTEGER");
+assert(Number.MAX_VALUE < Infinity, "Number.MAX_VALUE should be less than Infinity");
+
+assert.sameValue(Number.MAX_VALUE * 2, Infinity, "Number.MAX_VALUE multiplied by 2 should be Infinity");
+assert.sameValue(Number.MAX_VALUE, 1.7976931348623157e+308, "Number.MAX_VALUE should be approximately 1.7976931348623157e+308");
diff --git a/third_party/test262/test/built-ins/Number/MIN_VALUE/value.js b/third_party/test262/test/built-ins/Number/MIN_VALUE/value.js
new file mode 100644
index 00000000000000..33b0baae4a0142
--- /dev/null
+++ b/third_party/test262/test/built-ins/Number/MIN_VALUE/value.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2026 Luna Pfeiffer. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-number.min_value
+description: >
+  Number.MIN_VALUE is approximately 5e-324. We can't directly compare it as the spec states:
+
+  In the IEEE 754-2019 double precision binary representation, the smallest possible value is a denormalized number.
+  If an implementation does not support denormalized values, the value of Number.MIN_VALUE must be the smallest
+  non-zero positive value that can actually be represented by the implementation.
+---*/
+
+
+assert.sameValue(typeof Number.MIN_VALUE, "number", "Number.MIN_VALUE should be a number");
+assert(Number.MIN_VALUE > 0, "Number.MIN_VALUE must be positive");
+
+assert(Number.MIN_VALUE < Number.EPSILON, "Number.MIN_VALUE should be smaller than Number.EPSILON")
+
+assert.sameValue(Number.MIN_VALUE / 2, 0, "Number.MIN_VALUE divided by 2 should underflow to 0");
diff --git a/third_party/test262/test/built-ins/Temporal/Duration/prototype/round/rounding-increment-relativeto.js b/third_party/test262/test/built-ins/Temporal/Duration/prototype/round/rounding-increment-relativeto.js
index 762be1f1d5bba1..1e66b492d05f40 100644
--- a/third_party/test262/test/built-ins/Temporal/Duration/prototype/round/rounding-increment-relativeto.js
+++ b/third_party/test262/test/built-ins/Temporal/Duration/prototype/round/rounding-increment-relativeto.js
@@ -39,8 +39,3 @@ TemporalHelpers.assertDuration(new Temporal.Duration(0, 1, 0, 30).round({
   roundingIncrement: 2,
   relativeTo: new Temporal.PlainDate(1970, 7, 31)
 }), 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, `1m30d to 2m with relativeTo 1970-07-31`);
-TemporalHelpers.assertDuration(new Temporal.Duration(0, 1, 0, 30).round({
-  smallestUnit: "months",
-  roundingIncrement: 2,
-  relativeTo: Temporal.ZonedDateTime.from('2025-03-09T03:00:00-07:00[America/Vancouver]')
-}), 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, `1m30d to 2m with relativeTo 2025-03-09T03:00:00-07:00[America/Vancouver]`);
diff --git a/third_party/test262/test/intl402/Temporal/Duration/prototype/round/rounding-increment-relativeto.js b/third_party/test262/test/intl402/Temporal/Duration/prototype/round/rounding-increment-relativeto.js
new file mode 100644
index 00000000000000..b50c5d7e3cb1a3
--- /dev/null
+++ b/third_party/test262/test/intl402/Temporal/Duration/prototype/round/rounding-increment-relativeto.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.round
+description: Test a specific buggy case from temporal_rs
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const relativeTo = Temporal.ZonedDateTime.from('2025-03-09T03:00:00-07:00[America/Vancouver]');
+TemporalHelpers.assertDuration(new Temporal.Duration(0, 1, 0, 30).round({
+  smallestUnit: "months",
+  roundingIncrement: 2,
+  relativeTo,
+}), 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, `1m30d to 2m with relativeTo 2025-03-09T03:00:00-07:00[America/Vancouver]`);
diff --git a/third_party/test262/test/staging/sm/Atomics/cross-compartment.js b/third_party/test262/test/staging/sm/Atomics/cross-compartment.js
index 2606709b850ad6..4dd3fe77775b65 100644
--- a/third_party/test262/test/staging/sm/Atomics/cross-compartment.js
+++ b/third_party/test262/test/staging/sm/Atomics/cross-compartment.js
@@ -5,6 +5,7 @@
 description: |
   pending
 esid: pending
+features: [Atomics, SharedArrayBuffer]
 ---*/
 
 const otherGlobal = $262.createRealm().global;
@@ -111,4 +112,3 @@ for (let TA of intArrayConstructors) {
   assert.sameValue(val, 3);
   assert.sameValue(ta[0], 2);
 }
-
diff --git a/third_party/test262/test/staging/sm/Atomics/detached-buffers.js b/third_party/test262/test/staging/sm/Atomics/detached-buffers.js
index 9d0e605c2793c7..d1b1bf3ce31a8e 100644
--- a/third_party/test262/test/staging/sm/Atomics/detached-buffers.js
+++ b/third_party/test262/test/staging/sm/Atomics/detached-buffers.js
@@ -6,6 +6,7 @@ includes: [detachArrayBuffer.js]
 description: |
   pending
 esid: pending
+features: [Atomics]
 ---*/
 
 const intArrayConstructors = [
@@ -97,4 +98,3 @@ for (let TA of intArrayConstructors) {
   assert.throws(TypeError, () => Atomics.xor(ta, badValue(ta), 0));
   assert.throws(TypeError, () => Atomics.xor(ta, 0, badValue(ta)));
 }
-
diff --git a/third_party/test262/test/staging/sm/TypedArray/sort-negative-nan.js b/third_party/test262/test/staging/sm/TypedArray/sort-negative-nan.js
index 00e1c6c070c298..c5e0f433017679 100644
--- a/third_party/test262/test/staging/sm/TypedArray/sort-negative-nan.js
+++ b/third_party/test262/test/staging/sm/TypedArray/sort-negative-nan.js
@@ -6,6 +6,7 @@ includes: [sm/non262-TypedArray-shell.js]
 description: |
   pending
 esid: pending
+features: [Float16Array, Float32Array, Float64Array]
 ---*/
 // Test with all floating point typed arrays.
 const floatConstructors = anyTypedArrayConstructors.filter(isFloatConstructor);
@@ -136,4 +137,3 @@ for (const [TA, taLength] of prod(floatConstructors, typedArrayLengths)) {
         assert.sameValue(fta[nanOffset + i], NaN, `At offset: ${nanOffset + i}`);
     }
 }
-
diff --git a/third_party/test262/test/staging/sm/TypedArray/toString.js b/third_party/test262/test/staging/sm/TypedArray/toString.js
index 29adb9038ba34b..2b4d27d99a9067 100644
--- a/third_party/test262/test/staging/sm/TypedArray/toString.js
+++ b/third_party/test262/test/staging/sm/TypedArray/toString.js
@@ -6,6 +6,7 @@ includes: [sm/non262-TypedArray-shell.js, propertyHelper.js]
 description: |
   pending
 esid: pending
+features: [Float16Array]
 ---*/
 const TypedArrayPrototype = Object.getPrototypeOf(Int8Array.prototype);
 
diff --git a/third_party/test262/vendored.toml b/third_party/test262/vendored.toml
index 11954844c86b41..15b808c6cc920f 100644
--- a/third_party/test262/vendored.toml
+++ b/third_party/test262/vendored.toml
@@ -1,3 +1,3 @@
 [test262]
 source = "https://github.com/tc39/test262"
-rev = "b66872a92487694396fb082343e08dd7cca5ddf4"
+rev = "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33"