diff --git a/spanner/opencensus/pom.xml b/spanner/opencensus/pom.xml
index 6fa84828374..dc30a677e0a 100644
--- a/spanner/opencensus/pom.xml
+++ b/spanner/opencensus/pom.xml
@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.19.1</version>
+      <version>3.19.6</version>
     </dependency>
     <dependency>
       <groupId>io.opencensus</groupId>