diff --git a/Cargo.lock b/Cargo.lock
index 4ec3d2b560a..e6d50124d46 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -410,10 +410,10 @@ dependencies = [
  "thin-vec",
  "thiserror",
  "time",
- "tinystr 0.7.6",
+ "tinystr 0.8.1",
  "web-time",
  "writeable 0.5.5",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
 ]
 
@@ -1627,25 +1627,25 @@ dependencies = [
 
 [[package]]
 name = "icu_calendar"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3689f3f720936703584298dce9711d8c68b7aecef258d0e1e2677ec3d9567ff6"
+checksum = "9f664d19093224c9de27db5d1797b4105ae9545c0c540faf0d351884d1b24ca6"
 dependencies = [
  "calendrical_calculations",
  "displaydoc",
  "icu_calendar_data",
  "icu_locale_core",
- "icu_provider 2.0.0-beta1",
- "tinystr 0.8.0",
+ "icu_provider 2.0.0-beta2",
+ "tinystr 0.8.1",
  "writeable 0.6.0",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
 name = "icu_calendar_data"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a113bfe4a5f0a4f9ab2f4ec5baac9f5cfab7c5ada910abf4b9ed4cfd066881cd"
+checksum = "fd70bb6c7a5d0d24c94fa18309118879bbde09052b18eec96fc75aa4c6dbf659"
 dependencies = [
  "icu_locale",
  "icu_provider_baked",
@@ -1708,22 +1708,22 @@ dependencies = [
  "databake",
  "displaydoc",
  "serde",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
  "zerovec 0.10.4",
 ]
 
 [[package]]
 name = "icu_collections"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "547ceba155a760830b848d9ae28183bc6bddf1b714ffc27bee1c7144f07229db"
+checksum = "63df3227b8f369b3f7cc4003f0bdd9ca0083b871e2672811f699d69b473cc174"
 dependencies = [
  "displaydoc",
  "potential_utf",
- "yoke",
+ "yoke 0.8.0",
  "zerofrom",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
@@ -1867,38 +1867,38 @@ dependencies = [
 
 [[package]]
 name = "icu_locale"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f49d3c7f2dae0cd50d8b681a258e761eb714c9924f8222b7042118c0fb410649"
+checksum = "afa4c80f106c1cf0f1b66e0ae9806f603f1c2c41d004229af1b0c6cebe84c74a"
 dependencies = [
  "displaydoc",
- "icu_collections 2.0.0-beta1",
+ "icu_collections 2.0.0-beta2",
  "icu_locale_core",
  "icu_locale_data",
- "icu_provider 2.0.0-beta1",
+ "icu_provider 2.0.0-beta2",
  "potential_utf",
- "tinystr 0.8.0",
- "zerovec 0.11.0",
+ "tinystr 0.8.1",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
 name = "icu_locale_core"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e36332a8c93574b07598351bb479425282022341528ff521238fd4a48d143162"
+checksum = "b80161b66511e4eb415ef110c67ea8cab4400b749f9e30c8691fff1354934b6b"
 dependencies = [
  "displaydoc",
  "litemap",
- "tinystr 0.8.0",
+ "tinystr 0.8.1",
  "writeable 0.6.0",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
 name = "icu_locale_data"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "222f29513408cc4572fce10bcadd05505c61ca1e30412416661e2fd464821c80"
+checksum = "1c1adc94a0bde584f8751381c0427d763ef5068fd388d670fabf966569f01465"
 dependencies = [
  "icu_provider_baked",
 ]
@@ -1977,7 +1977,7 @@ dependencies = [
  "either",
  "serde",
  "writeable 0.5.5",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
 ]
 
@@ -2028,33 +2028,32 @@ dependencies = [
  "displaydoc",
  "erased-serde",
  "icu_locid",
- "icu_provider_macros 1.5.0",
+ "icu_provider_macros",
  "log",
  "postcard",
  "serde",
  "stable_deref_trait",
  "tinystr 0.7.6",
  "writeable 0.5.5",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
  "zerovec 0.10.4",
 ]
 
 [[package]]
 name = "icu_provider"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201d2b3bc0bd9a7ad78a00af62374365dd53ee6916942c645cd9e28778c238a5"
+checksum = "e0d462aad52985bb71e3140fcc44e54d816cf7f2c3f25cd9b090cc77a9798504"
 dependencies = [
  "displaydoc",
  "icu_locale_core",
- "icu_provider_macros 2.0.0-beta1",
  "stable_deref_trait",
- "tinystr 0.8.0",
+ "tinystr 0.8.1",
  "writeable 0.6.0",
- "yoke",
+ "yoke 0.8.0",
  "zerofrom",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
@@ -2073,13 +2072,14 @@ dependencies = [
 
 [[package]]
 name = "icu_provider_baked"
-version = "2.0.0-beta1"
+version = "2.0.0-beta2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c6494d25b75593ad56dcd9bde1040ef7e22e9c70b24c1de8920d9a919118893"
+checksum = "2794f00ee1999495f4f1a1e35aee8f54fe7cfcbcf909ec05b60522377200aecb"
 dependencies = [
- "icu_provider 2.0.0-beta1",
+ "icu_provider 2.0.0-beta2",
  "writeable 0.6.0",
  "zerotrie 0.2.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
@@ -2108,17 +2108,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "icu_provider_macros"
-version = "2.0.0-beta1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba0c1a4c9cca68c00053013b9ad7dc7d2e69aefed59dd9e38cb63347c28299b0"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "icu_segmenter"
 version = "1.5.0"
@@ -2289,8 +2278,9 @@ checksum = "d75a2a4b1b190afb6f5425f10f6a8f959d2ea0b9c2b1d79553551850539e4674"
 
 [[package]]
 name = "ixdtf"
-version = "0.3.0"
-source = "git+https://github.com/unicode-org/icu4x.git?rev=3d187da4d3f05b7e37603c4be3f2c1ce45100e03#3d187da4d3f05b7e37603c4be3f2c1ce45100e03"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3be3d801e2817c5311a3be4f1e1b2148dcd2b10baadb3a5eade0544a0521ac9"
 dependencies = [
  "displaydoc",
  "utf8_iter",
@@ -2928,12 +2918,12 @@ dependencies = [
 
 [[package]]
 name = "potential_utf"
-version = "0.1.0"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2a1d6d1132e166768a82805efecd7c326eb8dc70ad4a586da697836b44eb970"
+checksum = "e5a7c30837279ca13e7c867e9e40053bc68740f988cb07f7ca6df43cc734b585"
 dependencies = [
  "serde",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
@@ -3579,15 +3569,15 @@ checksum = "42a4d50cdb458045afc8131fd91b64904da29548bcb63c7236e0844936c13078"
 [[package]]
 name = "temporal_rs"
 version = "0.0.4"
-source = "git+https://github.com/boa-dev/temporal.git?rev=bca995742818fb8367a6df6aef0f32b45fa4841a#bca995742818fb8367a6df6aef0f32b45fa4841a"
+source = "git+https://github.com/boa-dev/temporal.git?rev=f27e2ffa3324e4cfb2bdf0b654b0d5bb2f15ed61#f27e2ffa3324e4cfb2bdf0b654b0d5bb2f15ed61"
 dependencies = [
  "combine",
  "iana-time-zone",
- "icu_calendar 2.0.0-beta1",
+ "icu_calendar 2.0.0-beta2",
  "ixdtf",
  "jiff-tzdb",
  "num-traits",
- "tinystr 0.8.0",
+ "tinystr 0.8.1",
  "tzif",
  "writeable 0.6.0",
 ]
@@ -3735,12 +3725,12 @@ dependencies = [
 
 [[package]]
 name = "tinystr"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2b56a820bb70060f096338fcc02edb78cb3f8fb21c5078503f48588cfcaf494"
+checksum = "5d4f6d1145dcb577acf783d4e601bc1d76a13337bb54e6233add580b07344c8b"
 dependencies = [
  "displaydoc",
- "zerovec 0.11.0",
+ "zerovec 0.11.1",
 ]
 
 [[package]]
@@ -4473,7 +4463,19 @@ checksum = "120e6aef9aa629e3d4f52dc8cc43a015c7724194c97dfaf45180d2daf2b77f40"
 dependencies = [
  "serde",
  "stable_deref_trait",
- "yoke-derive",
+ "yoke-derive 0.7.5",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f41bb01b8226ef4bfd589436a297c53d118f65921786300e427be8d487695cc"
+dependencies = [
+ "serde",
+ "stable_deref_trait",
+ "yoke-derive 0.8.0",
  "zerofrom",
 ]
 
@@ -4489,6 +4491,18 @@ dependencies = [
  "synstructure",
 ]
 
+[[package]]
+name = "yoke-derive"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38da3c9736e16c5d3c8c597a9aaa5d1fa565d0532ae05e27c24aa62fb32c0ab6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
 [[package]]
 name = "zerocopy"
 version = "0.7.35"
@@ -4567,7 +4581,7 @@ dependencies = [
  "displaydoc",
  "litemap",
  "serde",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
  "zerovec 0.10.4",
 ]
@@ -4589,20 +4603,20 @@ checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
 dependencies = [
  "databake",
  "serde",
- "yoke",
+ "yoke 0.7.5",
  "zerofrom",
  "zerovec-derive 0.10.3",
 ]
 
 [[package]]
 name = "zerovec"
-version = "0.11.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b622856b789971a6fe0442b69f3a2d7ac949005c4c8586b2c4ef09cc5182f2b"
+checksum = "94e62113720e311984f461c56b00457ae9981c0bc7859d22306cc2ae2f95571c"
 dependencies = [
- "yoke",
+ "yoke 0.8.0",
  "zerofrom",
- "zerovec-derive 0.11.0",
+ "zerovec-derive 0.11.1",
 ]
 
 [[package]]
@@ -4618,9 +4632,9 @@ dependencies = [
 
 [[package]]
 name = "zerovec-derive"
-version = "0.11.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "996c67268f00e216986ac140d8de9f47968c330b96aeefcae9ed296f23934448"
+checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index bd2ce5eafa8..a27e3214d8d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -71,7 +71,6 @@ static_assertions = "1.1.0"
 textwrap = "0.16.0"
 thin-vec = "0.2.13"
 time = { version = "0.3.37", default-features = false, features = ["local-offset", "large-dates", "wasm-bindgen", "parsing", "formatting", "macros"] }
-tinystr = "0.7.5"
 log = "0.4.26"
 simple_logger = "5.0.0"
 cargo_metadata = "0.19.1"
@@ -111,7 +110,7 @@ intrusive-collections = "0.9.7"
 cfg-if = "1.0.0"
 either = "1.14.0"
 sys-locale = "0.3.2"
-temporal_rs = { git = "https://github.com/boa-dev/temporal.git", rev = "bca995742818fb8367a6df6aef0f32b45fa4841a", default-features = false, features = ["tzdb"] }
+temporal_rs = { git = "https://github.com/boa-dev/temporal.git", rev = "f27e2ffa3324e4cfb2bdf0b654b0d5bb2f15ed61", default-features = false, features = ["tzdb"] }
 web-time = "1.1.0"
 criterion = "0.5.1"
 float-cmp = "0.10.0"
@@ -141,6 +140,7 @@ icu_properties = { version = "~1.5.0", default-features = true }
 icu_normalizer = { version = "~1.5.0", default-features = false }
 icu_decimal = { version = "~1.5.0", default-features = false }
 writeable = "~0.5.5"
+tinystr = "~0.8.1"
 yoke = "~0.7.5"
 zerofrom = "~0.1.5"
 fixed_decimal = "~0.5.6"
diff --git a/core/engine/src/builtins/intl/number_format/options.rs b/core/engine/src/builtins/intl/number_format/options.rs
index ab58762a38f..4dbbb8a9a12 100644
--- a/core/engine/src/builtins/intl/number_format/options.rs
+++ b/core/engine/src/builtins/intl/number_format/options.rs
@@ -224,7 +224,7 @@ impl std::str::FromStr for Currency {
             return Err(ParseCurrencyError);
         }
 
-        let curr = TinyAsciiStr::from_bytes(bytes).map_err(|_| ParseCurrencyError)?;
+        let curr = TinyAsciiStr::try_from_utf8(bytes).map_err(|_| ParseCurrencyError)?;
 
         // 2. Let normalized be the ASCII-uppercase of currency.
         // 3. If normalized contains any code unit outside of 0x0041 through 0x005A (corresponding
diff --git a/core/engine/src/builtins/temporal/instant/mod.rs b/core/engine/src/builtins/temporal/instant/mod.rs
index cbfae0abb74..562d44af0a7 100644
--- a/core/engine/src/builtins/temporal/instant/mod.rs
+++ b/core/engine/src/builtins/temporal/instant/mod.rs
@@ -85,7 +85,7 @@ impl IntrinsicObject for Instant {
                 js_string!("fromEpochNanoseconds"),
                 1,
             )
-            .static_method(Self::compare, js_string!("compare"), 1)
+            .static_method(Self::compare, js_string!("compare"), 2)
             .method(Self::add, js_string!("add"), 1)
             .method(Self::subtract, js_string!("subtract"), 1)
             .method(Self::until, js_string!("until"), 1)
@@ -243,7 +243,7 @@ impl Instant {
             })?;
         // 3. Let ns be instant.[[Nanoseconds]].
         // 4. Return ns.
-        Ok(JsBigInt::from(instant.inner.epoch_nanoseconds()).into())
+        Ok(JsBigInt::from(instant.inner.epoch_nanoseconds().as_i128()).into())
     }
 
     /// 8.3.7 `Temporal.Instant.prototype.add ( temporalDurationLike )`
diff --git a/core/engine/src/builtins/temporal/plain_date/mod.rs b/core/engine/src/builtins/temporal/plain_date/mod.rs
index 2fe2770572b..f56df482057 100644
--- a/core/engine/src/builtins/temporal/plain_date/mod.rs
+++ b/core/engine/src/builtins/temporal/plain_date/mod.rs
@@ -960,28 +960,15 @@ pub(crate) fn to_temporal_date(
 
         let options_obj = get_options_object(&options)?;
         // d. Let calendar be ? GetTemporalCalendarSlotValueWithISODefault(item).
-        let calendar = get_temporal_calendar_slot_value_with_default(object, context)?;
         let overflow =
-            get_option::<ArithmeticOverflow>(&options_obj, js_string!("overflow"), context)?
-                .unwrap_or(ArithmeticOverflow::Constrain);
+            get_option::<ArithmeticOverflow>(&options_obj, js_string!("overflow"), context)?;
 
         // e. Let fieldNames be ? CalendarFields(calendar, « "day", "month", "monthCode", "year" »).
         // f. Let fields be ? PrepareTemporalFields(item, fieldNames, «»).
         let partial = to_partial_date_record(object, context)?;
         // TODO: Move validation to `temporal_rs`.
-        if !(partial.day.is_some()
-            && (partial.month.is_some() || partial.month_code.is_some())
-            && (partial.year.is_some() || (partial.era.is_some() && partial.era_year.is_some())))
-        {
-            return Err(JsNativeError::typ()
-                .with_message("A partial date must have at least one defined field.")
-                .into());
-        }
-
         // g. Return ? CalendarDateFromFields(calendar, fields, options).
-        return calendar
-            .date_from_partial(&partial, overflow)
-            .map_err(Into::into);
+        return Ok(InnerDate::from_partial(partial, overflow)?);
     }
 
     // 5. If item is not a String, throw a TypeError exception.
@@ -1012,6 +999,7 @@ pub(crate) fn to_temporal_date(
     Ok(result)
 }
 
+// TODO: For order of operations, `to_partial_date_record` may need to take a `Option<Calendar>` arg.
 pub(crate) fn to_partial_date_record(
     partial_object: &JsObject,
     context: &mut Context,
diff --git a/core/engine/src/builtins/temporal/zoneddatetime/mod.rs b/core/engine/src/builtins/temporal/zoneddatetime/mod.rs
index 02109aa2a12..c3be2ef4105 100644
--- a/core/engine/src/builtins/temporal/zoneddatetime/mod.rs
+++ b/core/engine/src/builtins/temporal/zoneddatetime/mod.rs
@@ -26,7 +26,7 @@ use temporal_rs::{
     },
     partial::{PartialDate, PartialTime, PartialZonedDateTime},
     provider::{TimeZoneProvider, TransitionDirection},
-    Calendar, MonthCode, TimeZone, TinyAsciiStr, ZonedDateTime as ZonedDateTimeInner,
+    Calendar, MonthCode, TimeZone, TinyAsciiStr, UtcOffset, ZonedDateTime as ZonedDateTimeInner,
 };
 
 use super::{
@@ -354,6 +354,7 @@ impl IntrinsicObject for ZonedDateTime {
             .method(Self::subtract, js_string!("subtract"), 1)
             .method(Self::until, js_string!("until"), 1)
             .method(Self::since, js_string!("since"), 1)
+            .method(Self::round, js_string!("round"), 1)
             .method(Self::equals, js_string!("equals"), 1)
             .method(Self::to_string, js_string!("toString"), 0)
             .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
@@ -667,7 +668,7 @@ impl ZonedDateTime {
                 JsNativeError::typ().with_message("the this object must be a ZonedDateTime object.")
             })?;
 
-        Ok(JsBigInt::from(zdt.inner.epoch_nanoseconds()).into())
+        Ok(JsBigInt::from(zdt.inner.epoch_nanoseconds().as_i128()).into())
     }
 
     /// 6.3.19 get `Temporal.ZonedDateTime.prototype.dayOfWeek`
@@ -1053,6 +1054,13 @@ impl ZonedDateTime {
         create_temporal_duration(result, None, context).map(Into::into)
     }
 
+    /// 6.3.39 `Temporal.ZonedDateTime.prototype.round ( roundTo )`
+    fn round(_this: &JsValue, _args: &[JsValue], _context: &mut Context) -> JsResult<JsValue> {
+        Err(JsNativeError::error()
+            .with_message("Not yet implemented.")
+            .into())
+    }
+
     /// 6.3.40 `Temporal.ZonedDateTime.prototype.equals ( other )`
     fn equals(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
         let zdt = this
@@ -1473,7 +1481,7 @@ pub(crate) fn to_temporal_timezone_identifier(
     Ok(timezone)
 }
 
-fn to_offset_string(value: &JsValue, context: &mut Context) -> JsResult<String> {
+fn to_offset_string(value: &JsValue, context: &mut Context) -> JsResult<UtcOffset> {
     // 1. Let offset be ? ToPrimitive(argument, string).
     let offset = value.to_primitive(context, PreferredType::String)?;
     // 2. If offset is not a String, throw a TypeError exception.
@@ -1483,8 +1491,7 @@ fn to_offset_string(value: &JsValue, context: &mut Context) -> JsResult<String>
             .into());
     };
     // 3. Perform ? ParseDateTimeUTCOffset(offset).
-    let result = offset_string.to_std_string_escaped();
-    let _u = TimeZone::try_from_identifier_str(&result)?;
+    let result = UtcOffset::from_str(&offset_string.to_std_string_escaped())?;
     // 4. Return offset.
     Ok(result)
 }