diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac557daf2df..24874f856e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+## [1.21.0/0.44.0] 2023-11-16
+
 ### Removed
 
 - Remove the deprecated `go.opentelemetry.io/otel/bridge/opencensus.NewTracer`. (#4706)
@@ -2733,7 +2735,8 @@ It contains api and sdk for trace and meter.
 - CircleCI build CI manifest files.
 - CODEOWNERS file to track owners of this project.
 
-[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.20.0...HEAD
+[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.21.0...HEAD
+[1.21.0/0.44.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.21.0
 [1.20.0/0.43.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.20.0
 [1.19.0/0.42.0/0.0.7]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.19.0
 [1.19.0-rc.1/0.42.0-rc.1]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.19.0-rc.1
diff --git a/bridge/opencensus/go.mod b/bridge/opencensus/go.mod
index 374822ba851..dff07b9eedc 100644
--- a/bridge/opencensus/go.mod
+++ b/bridge/opencensus/go.mod
@@ -5,10 +5,10 @@ go 1.20
 require (
 	github.com/stretchr/testify v1.8.4
 	go.opencensus.io v0.24.0
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
@@ -18,7 +18,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
 	github.com/kr/pretty v0.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
diff --git a/bridge/opencensus/test/go.mod b/bridge/opencensus/test/go.mod
index 7fb92727b7c..5caaf20e0bc 100644
--- a/bridge/opencensus/test/go.mod
+++ b/bridge/opencensus/test/go.mod
@@ -4,18 +4,18 @@ go 1.20
 
 require (
 	go.opencensus.io v0.24.0
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/bridge/opencensus v0.43.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/bridge/opencensus v0.44.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/sdk/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/bridge/opencensus/version.go b/bridge/opencensus/version.go
index 6a7931d79f6..8fb56844e65 100644
--- a/bridge/opencensus/version.go
+++ b/bridge/opencensus/version.go
@@ -16,5 +16,5 @@ package opencensus // import "go.opentelemetry.io/otel/bridge/opencensus"
 
 // Version is the current release version of the opencensus bridge.
 func Version() string {
-	return "0.43.0"
+	return "0.44.0"
 }
diff --git a/bridge/opentracing/go.mod b/bridge/opentracing/go.mod
index 29c3904262b..c24a004e31e 100644
--- a/bridge/opentracing/go.mod
+++ b/bridge/opentracing/go.mod
@@ -9,8 +9,8 @@ replace go.opentelemetry.io/otel/trace => ../../trace
 require (
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
@@ -18,7 +18,7 @@ require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
diff --git a/bridge/opentracing/test/go.mod b/bridge/opentracing/test/go.mod
index 07572924dcf..f9102ff99af 100644
--- a/bridge/opentracing/test/go.mod
+++ b/bridge/opentracing/test/go.mod
@@ -12,8 +12,8 @@ require (
 	github.com/opentracing-contrib/go-grpc v0.0.0-20210225150812-73cb765af46e
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/bridge/opentracing v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/bridge/opentracing v1.21.0
 	google.golang.org/grpc v1.59.0
 )
 
@@ -23,8 +23,8 @@ require (
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
diff --git a/example/dice/go.mod b/example/dice/go.mod
index a6b78266570..f2b27857459 100644
--- a/example/dice/go.mod
+++ b/example/dice/go.mod
@@ -4,19 +4,19 @@ go 1.20
 
 require (
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.0
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.43.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.20.0
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.44.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 )
 
 require (
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/example/namedtracer/go.mod b/example/namedtracer/go.mod
index 28d7d5d519f..80f4e3e486b 100644
--- a/example/namedtracer/go.mod
+++ b/example/namedtracer/go.mod
@@ -9,15 +9,15 @@ replace (
 
 require (
 	github.com/go-logr/stdr v1.2.2
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
 	github.com/go-logr/logr v1.3.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/example/opencensus/go.mod b/example/opencensus/go.mod
index 1413220197d..f26d1bc4b5f 100644
--- a/example/opencensus/go.mod
+++ b/example/opencensus/go.mod
@@ -10,20 +10,20 @@ replace (
 
 require (
 	go.opencensus.io v0.24.0
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/bridge/opencensus v0.43.0
-	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.43.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/bridge/opencensus v0.44.0
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.44.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 )
 
 require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/example/otel-collector/go.mod b/example/otel-collector/go.mod
index 470f06e9775..82b1a731428 100644
--- a/example/otel-collector/go.mod
+++ b/example/otel-collector/go.mod
@@ -8,10 +8,10 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	google.golang.org/grpc v1.59.0
 )
 
@@ -21,8 +21,8 @@ require (
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.20.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
diff --git a/example/passthrough/go.mod b/example/passthrough/go.mod
index ca66eeca256..200df00c9b3 100644
--- a/example/passthrough/go.mod
+++ b/example/passthrough/go.mod
@@ -3,16 +3,16 @@ module go.opentelemetry.io/otel/example/passthrough
 go 1.20
 
 require (
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/example/prometheus/go.mod b/example/prometheus/go.mod
index af2614c5e4e..63c35c721d9 100644
--- a/example/prometheus/go.mod
+++ b/example/prometheus/go.mod
@@ -4,10 +4,10 @@ go 1.20
 
 require (
 	github.com/prometheus/client_golang v1.17.0
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/prometheus v0.43.0
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/prometheus v0.44.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 )
 
 require (
@@ -20,8 +20,8 @@ require (
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.44.0 // indirect
 	github.com/prometheus/procfs v0.11.1 // indirect
-	go.opentelemetry.io/otel/sdk v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 )
diff --git a/example/zipkin/go.mod b/example/zipkin/go.mod
index 038aeb15614..2bc95e9cc90 100644
--- a/example/zipkin/go.mod
+++ b/example/zipkin/go.mod
@@ -9,17 +9,17 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/zipkin v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/zipkin v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/openzipkin/zipkin-go v0.4.2 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 )
 
diff --git a/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod b/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
index a6b4b53bfb6..e2ac65cbea3 100644
--- a/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
+++ b/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
@@ -8,9 +8,9 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d
 	google.golang.org/grpc v1.59.0
@@ -26,8 +26,8 @@ require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.11.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
diff --git a/exporters/otlp/otlpmetric/otlpmetricgrpc/version.go b/exporters/otlp/otlpmetric/otlpmetricgrpc/version.go
index 5559d07f166..983968c6a3b 100644
--- a/exporters/otlp/otlpmetric/otlpmetricgrpc/version.go
+++ b/exporters/otlp/otlpmetric/otlpmetricgrpc/version.go
@@ -16,5 +16,5 @@ package otlpmetricgrpc // import "go.opentelemetry.io/otel/exporters/otlp/otlpme
 
 // Version is the current release version of the OpenTelemetry OTLP over gRPC metrics exporter in use.
 func Version() string {
-	return "0.43.0"
+	return "0.44.0"
 }
diff --git a/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod b/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
index 6e0bfbefac9..ee467b8831a 100644
--- a/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
+++ b/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
@@ -8,9 +8,9 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	google.golang.org/grpc v1.59.0
 	google.golang.org/protobuf v1.31.0
@@ -25,8 +25,8 @@ require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.11.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
diff --git a/exporters/otlp/otlpmetric/otlpmetrichttp/version.go b/exporters/otlp/otlpmetric/otlpmetrichttp/version.go
index fddac629584..59d7c1c2cb9 100644
--- a/exporters/otlp/otlpmetric/otlpmetrichttp/version.go
+++ b/exporters/otlp/otlpmetric/otlpmetrichttp/version.go
@@ -16,5 +16,5 @@ package otlpmetrichttp // import "go.opentelemetry.io/otel/exporters/otlp/otlpme
 
 // Version is the current release version of the OpenTelemetry OTLP over HTTP/protobuf metrics exporter in use.
 func Version() string {
-	return "0.43.0"
+	return "0.44.0"
 }
diff --git a/exporters/otlp/otlptrace/go.mod b/exporters/otlp/otlptrace/go.mod
index 05be37c0d30..cabf87efe00 100644
--- a/exporters/otlp/otlptrace/go.mod
+++ b/exporters/otlp/otlptrace/go.mod
@@ -5,9 +5,9 @@ go 1.20
 require (
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	google.golang.org/protobuf v1.31.0
 )
@@ -19,7 +19,7 @@ require (
 	github.com/kr/pretty v0.3.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.10.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
diff --git a/exporters/otlp/otlptrace/otlptracegrpc/go.mod b/exporters/otlp/otlptrace/otlptracegrpc/go.mod
index 2aa516a9da0..8aa8e0ad46e 100644
--- a/exporters/otlp/otlptrace/otlptracegrpc/go.mod
+++ b/exporters/otlp/otlptrace/otlptracegrpc/go.mod
@@ -5,10 +5,10 @@ go 1.20
 require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	go.uber.org/goleak v1.3.0
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d
@@ -24,7 +24,7 @@ require (
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
diff --git a/exporters/otlp/otlptrace/otlptracehttp/go.mod b/exporters/otlp/otlptrace/otlptracehttp/go.mod
index d036e834e1e..782fcfb4437 100644
--- a/exporters/otlp/otlptrace/otlptracehttp/go.mod
+++ b/exporters/otlp/otlptrace/otlptracehttp/go.mod
@@ -5,10 +5,10 @@ go 1.20
 require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	google.golang.org/grpc v1.59.0
 	google.golang.org/protobuf v1.31.0
@@ -22,7 +22,7 @@ require (
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
diff --git a/exporters/otlp/otlptrace/version.go b/exporters/otlp/otlptrace/version.go
index 620ea88bf14..8ee285b8d52 100644
--- a/exporters/otlp/otlptrace/version.go
+++ b/exporters/otlp/otlptrace/version.go
@@ -16,5 +16,5 @@ package otlptrace // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace"
 
 // Version is the current release version of the OpenTelemetry OTLP trace exporter in use.
 func Version() string {
-	return "1.20.0"
+	return "1.21.0"
 }
diff --git a/exporters/prometheus/go.mod b/exporters/prometheus/go.mod
index 8171dd61e91..fb72cc7732a 100644
--- a/exporters/prometheus/go.mod
+++ b/exporters/prometheus/go.mod
@@ -6,10 +6,10 @@ require (
 	github.com/prometheus/client_golang v1.17.0
 	github.com/prometheus/client_model v0.5.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 	google.golang.org/protobuf v1.31.0
 )
 
@@ -25,7 +25,7 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/common v0.44.0 // indirect
 	github.com/prometheus/procfs v0.11.1 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/exporters/stdout/stdoutmetric/go.mod b/exporters/stdout/stdoutmetric/go.mod
index 24745cf95c5..9b679f995f3 100644
--- a/exporters/stdout/stdoutmetric/go.mod
+++ b/exporters/stdout/stdoutmetric/go.mod
@@ -4,9 +4,9 @@ go 1.20
 
 require (
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
 )
 
 require (
@@ -14,8 +14,8 @@ require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/exporters/stdout/stdouttrace/go.mod b/exporters/stdout/stdouttrace/go.mod
index ed01ce0a33e..342d62af111 100644
--- a/exporters/stdout/stdouttrace/go.mod
+++ b/exporters/stdout/stdouttrace/go.mod
@@ -9,9 +9,9 @@ replace (
 
 require (
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
@@ -19,7 +19,7 @@ require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/exporters/zipkin/go.mod b/exporters/zipkin/go.mod
index 61e1d88cb31..e475587a71d 100644
--- a/exporters/zipkin/go.mod
+++ b/exporters/zipkin/go.mod
@@ -8,15 +8,15 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/openzipkin/zipkin-go v0.4.2
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.mod b/go.mod
index f21dd71302d..e8b192b3f78 100644
--- a/go.mod
+++ b/go.mod
@@ -7,8 +7,8 @@ require (
 	github.com/go-logr/stdr v1.2.2
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 )
 
 require (
diff --git a/metric/go.mod b/metric/go.mod
index 4d3aa33b98f..d0596d4bea6 100644
--- a/metric/go.mod
+++ b/metric/go.mod
@@ -4,7 +4,7 @@ go 1.20
 
 require (
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
+	go.opentelemetry.io/otel v1.21.0
 )
 
 require (
@@ -12,7 +12,7 @@ require (
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
diff --git a/sdk/go.mod b/sdk/go.mod
index 995cd01ed41..a9ee37410ee 100644
--- a/sdk/go.mod
+++ b/sdk/go.mod
@@ -8,8 +8,8 @@ require (
 	github.com/go-logr/logr v1.3.0
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	golang.org/x/sys v0.14.0
 )
 
@@ -17,7 +17,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.20.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
diff --git a/sdk/metric/go.mod b/sdk/metric/go.mod
index 92ed848e9e6..8a22ee89cc7 100644
--- a/sdk/metric/go.mod
+++ b/sdk/metric/go.mod
@@ -6,15 +6,15 @@ require (
 	github.com/go-logr/logr v1.3.0
 	github.com/go-logr/stdr v1.2.2
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
+	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/sdk/metric/version.go b/sdk/metric/version.go
index 4437747f208..edcf7cfc862 100644
--- a/sdk/metric/version.go
+++ b/sdk/metric/version.go
@@ -16,5 +16,5 @@ package metric // import "go.opentelemetry.io/otel/sdk/metric"
 
 // version is the current release version of the metric SDK in use.
 func version() string {
-	return "1.20.0"
+	return "1.21.0"
 }
diff --git a/sdk/version.go b/sdk/version.go
index 7048c788e93..422d4c964b3 100644
--- a/sdk/version.go
+++ b/sdk/version.go
@@ -16,5 +16,5 @@ package sdk // import "go.opentelemetry.io/otel/sdk"
 
 // Version is the current release version of the OpenTelemetry SDK in use.
 func Version() string {
-	return "1.20.0"
+	return "1.21.0"
 }
diff --git a/trace/go.mod b/trace/go.mod
index ddec57195ee..4dda77a8cb4 100644
--- a/trace/go.mod
+++ b/trace/go.mod
@@ -7,7 +7,7 @@ replace go.opentelemetry.io/otel => ../
 require (
 	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.8.4
-	go.opentelemetry.io/otel v1.20.0
+	go.opentelemetry.io/otel v1.21.0
 )
 
 require (
diff --git a/version.go b/version.go
index 5a92f1d4b6c..e2f743585d1 100644
--- a/version.go
+++ b/version.go
@@ -16,5 +16,5 @@ package otel // import "go.opentelemetry.io/otel"
 
 // Version is the current release version of OpenTelemetry in use.
 func Version() string {
-	return "1.20.0"
+	return "1.21.0"
 }
diff --git a/versions.yaml b/versions.yaml
index a027f861c42..3c153c9d6fc 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -14,7 +14,7 @@
 
 module-sets:
   stable-v1:
-    version: v1.20.0
+    version: v1.21.0
     modules:
       - go.opentelemetry.io/otel
       - go.opentelemetry.io/otel/bridge/opentracing
@@ -34,7 +34,7 @@ module-sets:
       - go.opentelemetry.io/otel/sdk/metric
       - go.opentelemetry.io/otel/trace
   experimental-metrics:
-    version: v0.43.0
+    version: v0.44.0
     modules:
       - go.opentelemetry.io/otel/bridge/opencensus
       - go.opentelemetry.io/otel/bridge/opencensus/test