diff --git a/slim/otlp/go.mod b/slim/otlp/go.mod
index 0b86f2c..a8225ea 100644
--- a/slim/otlp/go.mod
+++ b/slim/otlp/go.mod
@@ -2,6 +2,6 @@ module go.opentelemetry.io/proto/slim/otlp
 
 go 1.17
 
-require google.golang.org/protobuf v1.32.0
+require google.golang.org/protobuf v1.33.0
 
 require github.com/google/go-cmp v0.6.0 // indirect
diff --git a/slim/otlp/go.sum b/slim/otlp/go.sum
index afa2934..6013313 100644
--- a/slim/otlp/go.sum
+++ b/slim/otlp/go.sum
@@ -4,5 +4,5 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
-google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=