diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4d4dcfa0bc..212b30a8a6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,7 +64,6 @@
 * [BUGFIX] Fix issue when using the experimental `-ruler.max-independent-rule-evaluation-concurrency` feature, where the ruler could panic as it updates a running ruleset or shutdowns. #9726
 * [BUGFIX] Ingester: Fix race condition in per-tenant TSDB creation. #9708
 * [BUGFIX] Ingester: Fix race condition in exemplar adding. #9765
-* [BUGFIX] Ingester: Fix race condition in series adding. #9765
 * [BUGFIX] Ingester: Fix race condition in native histogram appending. #9765
 
 ### Mixin
diff --git a/go.mod b/go.mod
index 71eacced97a..3c34457c482 100644
--- a/go.mod
+++ b/go.mod
@@ -282,7 +282,7 @@ require (
 )
 
 // Using a fork of Prometheus with Mimir-specific changes.
-replace github.com/prometheus/prometheus => github.com/grafana/mimir-prometheus v0.0.0-20241104085513-57e1ca2a6f61
+replace github.com/prometheus/prometheus => github.com/grafana/mimir-prometheus v0.0.0-20241104175756-dea6247a158f
 
 // Replace memberlist with our fork which includes some fixes that haven't been
 // merged upstream yet:
diff --git a/go.sum b/go.sum
index d52f55a1bbb..e233b6740a9 100644
--- a/go.sum
+++ b/go.sum
@@ -1270,8 +1270,8 @@ github.com/grafana/gomemcache v0.0.0-20241016125027-0a5bcc5aef40 h1:1TeKhyS+pvzO
 github.com/grafana/gomemcache v0.0.0-20241016125027-0a5bcc5aef40/go.mod h1:IGRj8oOoxwJbHBYl1+OhS9UjQR0dv6SQOep7HqmtyFU=
 github.com/grafana/memberlist v0.3.1-0.20220714140823-09ffed8adbbe h1:yIXAAbLswn7VNWBIvM71O2QsgfgW9fRXZNR0DXe6pDU=
 github.com/grafana/memberlist v0.3.1-0.20220714140823-09ffed8adbbe/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOnAH9VT3Sh9MUE=
-github.com/grafana/mimir-prometheus v0.0.0-20241104085513-57e1ca2a6f61 h1:5iLgPt4mT0zZoe3N+y4Dw8IAvxJwTl0eIlUS8q0iGg0=
-github.com/grafana/mimir-prometheus v0.0.0-20241104085513-57e1ca2a6f61/go.mod h1:7SuFBLahBoRY7KcgzWzK0p1n5QL+5dyr/Ysat6v1378=
+github.com/grafana/mimir-prometheus v0.0.0-20241104175756-dea6247a158f h1:/0K7ExuyP5pS/AUqibuJi6ATxEaZG6/2wcAbWMvw8D4=
+github.com/grafana/mimir-prometheus v0.0.0-20241104175756-dea6247a158f/go.mod h1:7SuFBLahBoRY7KcgzWzK0p1n5QL+5dyr/Ysat6v1378=
 github.com/grafana/opentracing-contrib-go-stdlib v0.0.0-20230509071955-f410e79da956 h1:em1oddjXL8c1tL0iFdtVtPloq2hRPen2MJQKoAWpxu0=
 github.com/grafana/opentracing-contrib-go-stdlib v0.0.0-20230509071955-f410e79da956/go.mod h1:qtI1ogk+2JhVPIXVc6q+NHziSmy2W5GbdQZFUHADCBU=
 github.com/grafana/prometheus-alertmanager v0.25.1-0.20240930132144-b5e64e81e8d3 h1:6D2gGAwyQBElSrp3E+9lSr7k8gLuP3Aiy20rweLWeBw=
diff --git a/vendor/github.com/prometheus/prometheus/tsdb/index/postings.go b/vendor/github.com/prometheus/prometheus/tsdb/index/postings.go
index 5f9c27d8fe9..15536c69c97 100644
--- a/vendor/github.com/prometheus/prometheus/tsdb/index/postings.go
+++ b/vendor/github.com/prometheus/prometheus/tsdb/index/postings.go
@@ -368,14 +368,13 @@ func (p *MemPostings) Add(id storage.SeriesRef, lset labels.Labels) {
 	p.mtx.Unlock()
 }
 
-func appendWithExponentialGrowth[T any](a []T, v T) (_ []T, copied bool) {
+func appendWithExponentialGrowth[T any](a []T, v T) []T {
 	if cap(a) < len(a)+1 {
 		newList := make([]T, len(a), len(a)*2+1)
 		copy(newList, a)
 		a = newList
-		copied = true
 	}
-	return append(a, v), copied
+	return append(a, v)
 }
 
 func (p *MemPostings) addFor(id storage.SeriesRef, l labels.Label) {
@@ -384,26 +383,16 @@ func (p *MemPostings) addFor(id storage.SeriesRef, l labels.Label) {
 		nm = map[string][]storage.SeriesRef{}
 		p.m[l.Name] = nm
 	}
-	list, copied := appendWithExponentialGrowth(nm[l.Value], id)
+	list := appendWithExponentialGrowth(nm[l.Value], id)
 	nm[l.Value] = list
 
-	// Return if it shouldn't be ordered, if it only has one element or if it's already ordered.
-	// The invariant is that the first n-1 items in the list are already sorted.
-	if !p.ordered || len(list) == 1 || list[len(list)-1] >= list[len(list)-2] {
+	if !p.ordered {
 		return
 	}
-
-	if !copied {
-		// We have appended to the existing slice,
-		// and readers may already have a copy of this postings slice,
-		// so we need to copy it before sorting.
-		old := list
-		list = make([]storage.SeriesRef, len(old), cap(old))
-		copy(list, old)
-		nm[l.Value] = list
-	}
-
-	// Repair order violations.
+	// There is no guarantee that no higher ID was inserted before as they may
+	// be generated independently before adding them to postings.
+	// We repair order violations on insert. The invariant is that the first n-1
+	// items in the list are already sorted.
 	for i := len(list) - 1; i >= 1; i-- {
 		if list[i] >= list[i-1] {
 			break
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3f5f9aeb05f..ad438ab45d5 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -1007,7 +1007,7 @@ github.com/prometheus/exporter-toolkit/web
 github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
-# github.com/prometheus/prometheus v1.99.0 => github.com/grafana/mimir-prometheus v0.0.0-20241104085513-57e1ca2a6f61
+# github.com/prometheus/prometheus v1.99.0 => github.com/grafana/mimir-prometheus v0.0.0-20241104175756-dea6247a158f
 ## explicit; go 1.22.0
 github.com/prometheus/prometheus/config
 github.com/prometheus/prometheus/discovery
@@ -1671,7 +1671,7 @@ sigs.k8s.io/kustomize/kyaml/yaml/walk
 sigs.k8s.io/yaml
 sigs.k8s.io/yaml/goyaml.v2
 sigs.k8s.io/yaml/goyaml.v3
-# github.com/prometheus/prometheus => github.com/grafana/mimir-prometheus v0.0.0-20241104085513-57e1ca2a6f61
+# github.com/prometheus/prometheus => github.com/grafana/mimir-prometheus v0.0.0-20241104175756-dea6247a158f
 # github.com/hashicorp/memberlist => github.com/grafana/memberlist v0.3.1-0.20220714140823-09ffed8adbbe
 # gopkg.in/yaml.v3 => github.com/colega/go-yaml-yaml v0.0.0-20220720105220-255a8d16d094
 # github.com/grafana/regexp => github.com/grafana/regexp v0.0.0-20240531075221-3685f1377d7b