diff --git a/.gitmodules b/.gitmodules
index 99b1e18..c82d57f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "opentelemetry-proto"]
 	path = opentelemetry-proto
 	url = https://github.com/open-telemetry/opentelemetry-proto
-	branch = v0.17.0
+	branch = v0.18.0
diff --git a/opentelemetry-proto b/opentelemetry-proto
index 5c2fe5d..c5c8b28 160000
--- a/opentelemetry-proto
+++ b/opentelemetry-proto
@@ -1 +1 @@
-Subproject commit 5c2fe5ddbd9fb9f3e08f31d20f7566a3ee3d8885
+Subproject commit c5c8b28012583fda55b0cb16f73a820722171d49
diff --git a/otlp/metrics/v1/metrics.pb.go b/otlp/metrics/v1/metrics.pb.go
index d6f3354..6609e85 100644
--- a/otlp/metrics/v1/metrics.pb.go
+++ b/otlp/metrics/v1/metrics.pb.go
@@ -1417,7 +1417,7 @@ type ExponentialHistogramDataPoint struct {
 	// Negative events *can* be recorded, but sum should not be filled out when
 	// doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
 	// see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
-	Sum float64 `protobuf:"fixed64,5,opt,name=sum,proto3" json:"sum,omitempty"`
+	Sum *float64 `protobuf:"fixed64,5,opt,name=sum,proto3,oneof" json:"sum,omitempty"`
 	// scale describes the resolution of the histogram.  Boundaries are
 	// located at powers of the base, where:
 	//
@@ -1520,8 +1520,8 @@ func (x *ExponentialHistogramDataPoint) GetCount() uint64 {
 }
 
 func (x *ExponentialHistogramDataPoint) GetSum() float64 {
-	if x != nil {
-		return x.Sum
+	if x != nil && x.Sum != nil {
+		return *x.Sum
 	}
 	return 0
 }
@@ -2180,7 +2180,7 @@ var file_opentelemetry_proto_metrics_v1_metrics_proto_rawDesc = []byte{
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@@ -2193,100 +2193,101 @@ var file_opentelemetry_proto_metrics_v1_metrics_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/versions.yaml b/versions.yaml
index 6c5b455..81db350 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -14,7 +14,7 @@
 
 module-sets:
   all:
-    version: v0.17.0
+    version: v0.18.0
     modules:
       - go.opentelemetry.io/proto
       - go.opentelemetry.io/proto/otlp