diff --git a/Cargo.toml b/Cargo.toml
index 3005b381d..583f59f78 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ derive_more = { version = "1.0", features = ["constructor", "display", "from", "
 thiserror = "2"
 tonic = "0.12"
 tonic-build = "0.12"
-opentelemetry = { version = "0.24", features = ["metrics"] }
+opentelemetry = { version = "0.26", features = ["metrics"] }
 prost = "0.13"
 prost-types = "0.13"
 
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 3d5221f47..562032468 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -43,9 +43,9 @@ itertools = "0.13"
 lru = "0.12"
 mockall = "0.13"
 opentelemetry = { workspace = true, features = ["metrics"], optional = true }
-opentelemetry_sdk = { version = "0.24", features = ["rt-tokio", "metrics"], optional = true }
-opentelemetry-otlp = { version = "0.17", features = ["tokio", "metrics", "tls"], optional = true }
-opentelemetry-prometheus = { version = "0.17", optional = true }
+opentelemetry_sdk = { version = "0.26", features = ["rt-tokio", "metrics"], optional = true }
+opentelemetry-otlp = { version = "0.26", features = ["tokio", "metrics", "tls"], optional = true }
+opentelemetry-prometheus = { git = "https://github.com/open-telemetry/opentelemetry-rust.git", rev = "e911383", optional = true }
 parking_lot = { version = "0.12", features = ["send_guard"] }
 pid = "4.0"
 pin-project = "1.0"
diff --git a/core/src/telemetry/otel.rs b/core/src/telemetry/otel.rs
index 138c0a817..c4bca1c52 100644
--- a/core/src/telemetry/otel.rs
+++ b/core/src/telemetry/otel.rs
@@ -19,11 +19,8 @@ use opentelemetry::{
 use opentelemetry_otlp::WithExportConfig;
 use opentelemetry_sdk::{
     metrics::{
-        data::Temporality,
-        new_view,
-        reader::{AggregationSelector, DefaultAggregationSelector, TemporalitySelector},
-        Aggregation, Instrument, InstrumentKind, MeterProviderBuilder, PeriodicReader,
-        SdkMeterProvider, View,
+        data::Temporality, new_view, reader::TemporalitySelector, Aggregation, Instrument,
+        InstrumentKind, MeterProviderBuilder, PeriodicReader, SdkMeterProvider, View,
     },
     runtime, Resource,
 };
@@ -38,38 +35,6 @@ use temporal_sdk_core_api::telemetry::{
 use tokio::task::AbortHandle;
 use tonic::{metadata::MetadataMap, transport::ClientTlsConfig};
 
-/// Chooses appropriate aggregators for our metrics
-#[derive(Debug, Clone)]
-struct SDKAggSelector {
-    use_seconds: bool,
-    default: DefaultAggregationSelector,
-}
-
-impl SDKAggSelector {
-    fn new(use_seconds: bool) -> Self {
-        Self {
-            use_seconds,
-            default: Default::default(),
-        }
-    }
-}
-
-impl AggregationSelector for SDKAggSelector {
-    fn aggregation(&self, kind: InstrumentKind) -> Aggregation {
-        match kind {
-            InstrumentKind::Histogram => Aggregation::ExplicitBucketHistogram {
-                boundaries: if self.use_seconds {
-                    DEFAULT_S_BUCKETS.to_vec()
-                } else {
-                    DEFAULT_MS_BUCKETS.to_vec()
-                },
-                record_min_max: true,
-            },
-            _ => self.default.aggregation(kind),
-        }
-    }
-}
-
 fn histo_view(
     metric_name: &'static str,
     use_seconds: bool,
@@ -130,6 +95,24 @@ pub(super) fn augment_meter_provider_with_defaults(
             ),
         )?)
     }
+    // Fallback default
+    mpb = mpb.with_view(new_view(
+        {
+            let mut i = Instrument::new();
+            i.kind = Some(InstrumentKind::Histogram);
+            i
+        },
+        opentelemetry_sdk::metrics::Stream::new().aggregation(
+            Aggregation::ExplicitBucketHistogram {
+                boundaries: if use_seconds {
+                    DEFAULT_S_BUCKETS.to_vec()
+                } else {
+                    DEFAULT_MS_BUCKETS.to_vec()
+                },
+                record_min_max: true,
+            },
+        ),
+    )?);
     Ok(mpb.with_resource(default_resource(global_tags)))
 }
 
@@ -144,10 +127,9 @@ pub fn build_otlp_metric_exporter(
     }
     let exporter = exporter
         .with_metadata(MetadataMap::from_headers((&opts.headers).try_into()?))
-        .build_metrics_exporter(
-            Box::new(SDKAggSelector::new(opts.use_seconds_for_durations)),
-            Box::new(metric_temporality_to_selector(opts.metric_temporality)),
-        )?;
+        .build_metrics_exporter(Box::new(metric_temporality_to_selector(
+            opts.metric_temporality,
+        )))?;
     let reader = PeriodicReader::builder(exporter, runtime::Tokio)
         .with_interval(opts.metric_periodicity)
         .build();
@@ -178,8 +160,7 @@ pub struct StartedPromServer {
 pub fn start_prometheus_metric_exporter(
     opts: PrometheusExporterOptions,
 ) -> Result<StartedPromServer, anyhow::Error> {
-    let (srv, exporter) =
-        PromServer::new(&opts, SDKAggSelector::new(opts.use_seconds_for_durations))?;
+    let (srv, exporter) = PromServer::new(&opts)?;
     let meter_provider = augment_meter_provider_with_defaults(
         MeterProviderBuilder::default().with_reader(exporter),
         &opts.global_tags,
@@ -202,7 +183,7 @@ pub fn start_prometheus_metric_exporter(
 
 #[derive(Debug)]
 pub struct CoreOtelMeter {
-    meter: Meter,
+    pub meter: Meter,
     use_seconds_for_durations: bool,
     // we have to hold on to the provider otherwise otel automatically shuts it down on drop
     // for whatever crazy reason
diff --git a/core/src/telemetry/prometheus_server.rs b/core/src/telemetry/prometheus_server.rs
index 9eefa700c..e49ddf9a1 100644
--- a/core/src/telemetry/prometheus_server.rs
+++ b/core/src/telemetry/prometheus_server.rs
@@ -5,7 +5,6 @@ use hyper_util::{
     server::conn::auto,
 };
 use opentelemetry_prometheus::PrometheusExporter;
-use opentelemetry_sdk::metrics::reader::AggregationSelector;
 use prometheus::{Encoder, Registry, TextEncoder};
 use std::net::{SocketAddr, TcpListener};
 use temporal_sdk_core_api::telemetry::PrometheusExporterOptions;
@@ -20,11 +19,9 @@ pub(super) struct PromServer {
 impl PromServer {
     pub(super) fn new(
         opts: &PrometheusExporterOptions,
-        aggregation: impl AggregationSelector + 'static,
     ) -> Result<(Self, PrometheusExporter), anyhow::Error> {
         let registry = Registry::new();
         let exporter = opentelemetry_prometheus::exporter()
-            .with_aggregation_selector(aggregation)
             .without_scope_info()
             .with_registry(registry.clone());
         let exporter = if !opts.counters_total_suffix {