diff --git a/requirements-base.txt b/requirements-base.txt
index 0305e0c13cbfe1..e13ed4b3e6f858 100644
--- a/requirements-base.txt
+++ b/requirements-base.txt
@@ -68,7 +68,7 @@ rfc3986-validator>=0.1.1
 sentry-arroyo>=2.21.0
 sentry-kafka-schemas>=1.2.0
 sentry-ophio>=1.1.3
-sentry-protos==0.1.72
+sentry-protos==0.1.74
 sentry-redis-tools>=0.5.0
 sentry-relay>=0.9.8
 sentry-sdk[http2]>=2.25.1
diff --git a/requirements-dev-frozen.txt b/requirements-dev-frozen.txt
index 2e58ab5cc9d667..8cc5d7e468fe89 100644
--- a/requirements-dev-frozen.txt
+++ b/requirements-dev-frozen.txt
@@ -189,7 +189,7 @@ sentry-forked-djangorestframework-stubs==3.15.3.post1
 sentry-forked-email-reply-parser==0.5.12.post1
 sentry-kafka-schemas==1.2.0
 sentry-ophio==1.1.3
-sentry-protos==0.1.72
+sentry-protos==0.1.74
 sentry-redis-tools==0.5.0
 sentry-relay==0.9.8
 sentry-sdk==2.27.0
diff --git a/requirements-frozen.txt b/requirements-frozen.txt
index 1a37bb36f16e7e..f84ef2c5a444f0 100644
--- a/requirements-frozen.txt
+++ b/requirements-frozen.txt
@@ -127,7 +127,7 @@ sentry-arroyo==2.21.0
 sentry-forked-email-reply-parser==0.5.12.post1
 sentry-kafka-schemas==1.2.0
 sentry-ophio==1.1.3
-sentry-protos==0.1.72
+sentry-protos==0.1.74
 sentry-redis-tools==0.5.0
 sentry-relay==0.9.8
 sentry-sdk==2.27.0
diff --git a/src/sentry/search/eap/constants.py b/src/sentry/search/eap/constants.py
index d1079247a828a2..b94af5eb467dff 100644
--- a/src/sentry/search/eap/constants.py
+++ b/src/sentry/search/eap/constants.py
@@ -162,4 +162,5 @@
     "BEST_EFFORT": DownsampledStorageConfig.MODE_BEST_EFFORT,
     "PREFLIGHT": DownsampledStorageConfig.MODE_PREFLIGHT,
     "NORMAL": DownsampledStorageConfig.MODE_NORMAL,
+    "HIGHEST_ACCURACY": DownsampledStorageConfig.MODE_HIGHEST_ACCURACY,
 }
diff --git a/src/sentry/search/eap/utils.py b/src/sentry/search/eap/utils.py
index dec734e83240b7..42b0b47e16b0b4 100644
--- a/src/sentry/search/eap/utils.py
+++ b/src/sentry/search/eap/utils.py
@@ -102,7 +102,7 @@ def transform_column_to_expression(column: Column) -> Expression:
 
 def validate_sampling(sampling_mode: SAMPLING_MODES | None) -> DownsampledStorageConfig:
     if sampling_mode is None:
-        return DownsampledStorageConfig(mode=DownsampledStorageConfig.MODE_UNSPECIFIED)
+        return DownsampledStorageConfig(mode=DownsampledStorageConfig.MODE_HIGHEST_ACCURACY)
     if sampling_mode not in SAMPLING_MODE_MAP:
         raise InvalidSearchQuery(f"sampling mode: {sampling_mode} is not supported")
     else:
diff --git a/src/sentry/search/events/types.py b/src/sentry/search/events/types.py
index 11099151324dcd..a190000f87fb50 100644
--- a/src/sentry/search/events/types.py
+++ b/src/sentry/search/events/types.py
@@ -81,7 +81,7 @@ class EventsResponse(TypedDict):
     meta: EventsMeta
 
 
-SAMPLING_MODES = Literal["BEST_EFFORT", "PREFLIGHT", "NORMAL"]
+SAMPLING_MODES = Literal["BEST_EFFORT", "PREFLIGHT", "NORMAL", "HIGHEST_ACCURACY"]
 
 
 @dataclass
diff --git a/tests/snuba/api/endpoints/test_organization_events_stats_span_indexed.py b/tests/snuba/api/endpoints/test_organization_events_stats_span_indexed.py
index df346a487fc600..55c45cf523a18c 100644
--- a/tests/snuba/api/endpoints/test_organization_events_stats_span_indexed.py
+++ b/tests/snuba/api/endpoints/test_organization_events_stats_span_indexed.py
@@ -2017,3 +2017,32 @@ def test_downsampling_can_go_to_higher_accuracy_tier(self):
         )
 
         assert response.data["meta"]["dataScanned"] == "partial"
+
+    def test_request_without_sampling_mode_defaults_to_highest_accuracy(self):
+        response = self._do_request(
+            data={
+                "start": self.day_ago,
+                "end": self.day_ago + timedelta(minutes=3),
+                "interval": "1m",
+                "yAxis": "count()",
+                "project": self.project.id,
+                "dataset": self.dataset,
+            },
+        )
+
+        assert response.data["meta"]["dataScanned"] == "full"
+
+    def test_request_to_highest_accuracy_mode(self):
+        response = self._do_request(
+            data={
+                "start": self.day_ago,
+                "end": self.day_ago + timedelta(minutes=3),
+                "interval": "1m",
+                "yAxis": "count()",
+                "project": self.project.id,
+                "dataset": self.dataset,
+                "sampling": "HIGHEST_ACCURACY",
+            },
+        )
+
+        assert response.data["meta"]["dataScanned"] == "full"