diff --git a/samples/install-without-bom/pom.xml b/samples/install-without-bom/pom.xml
index 140a2ab86..fe302c4cc 100644
--- a/samples/install-without-bom/pom.xml
+++ b/samples/install-without-bom/pom.xml
@@ -75,7 +75,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java-util</artifactId>
-      <version>3.15.5</version>
+      <version>3.15.6</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>
diff --git a/samples/snapshot/pom.xml b/samples/snapshot/pom.xml
index c95d747f1..f2b91ec6c 100644
--- a/samples/snapshot/pom.xml
+++ b/samples/snapshot/pom.xml
@@ -61,7 +61,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java-util</artifactId>
-      <version>3.15.5</version>
+      <version>3.15.6</version>
     </dependency>
 
     <dependency>
diff --git a/samples/snippets/pom.xml b/samples/snippets/pom.xml
index 14bec5145..827c0e980 100644
--- a/samples/snippets/pom.xml
+++ b/samples/snippets/pom.xml
@@ -72,7 +72,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java-util</artifactId>
-      <version>3.15.5</version>
+      <version>3.15.6</version>
     </dependency>
 
     <dependency>