diff --git a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ExternalProjectSerializationService.java b/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ExternalProjectSerializationService.java
index dab8792d55c1..2706145b2234 100644
--- a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ExternalProjectSerializationService.java
+++ b/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ExternalProjectSerializationService.java
@@ -206,7 +206,7 @@ public final class ExternalProjectSerializationService implements SerializationS
     writer.stepOut();
   }
 
-  static void writeDependency(
+  private static void writeDependency(
     IonWriter writer,
     WriteContext context,
     ExternalDependency dependency
@@ -592,7 +592,7 @@ public final class ExternalProjectSerializationService implements SerializationS
     return dependencies;
   }
 
-  static ExternalDependency readDependency(final IonReader reader, final ReadContext context) {
+  private static ExternalDependency readDependency(final IonReader reader, final ReadContext context) {
     if (reader.next() == null) return null;
     reader.stepIn();
 
diff --git a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamApiUtils.java b/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamApiUtils.java
index a4a3c5e99ffc..5936c396e9d4 100644
--- a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamApiUtils.java
+++ b/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamApiUtils.java
@@ -15,7 +15,7 @@ import java.io.IOException;
 import java.util.*;
 import java.util.concurrent.ConcurrentMap;
 
-public class ToolingStreamApiUtils {
+public final class ToolingStreamApiUtils {
   public static final String OBJECT_ID_FIELD = "objectID";
 
   // todo what about PooledBlockAllocatorProvider?
diff --git a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamUtils.java b/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamUtils.java
deleted file mode 100644
index 248c0446e206..000000000000
--- a/plugins/gradle/tooling-extension-impl/src/org/jetbrains/plugins/gradle/tooling/serialization/ToolingStreamUtils.java
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package org.jetbrains.plugins.gradle.tooling.serialization;
-
-import com.amazon.ion.IonReader;
-import com.amazon.ion.IonWriter;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.plugins.gradle.model.ExternalDependency;
-import org.jetbrains.plugins.gradle.tooling.serialization.ExternalProjectSerializationService.ReadContext;
-import org.jetbrains.plugins.gradle.tooling.serialization.ExternalProjectSerializationService.WriteContext;
-
-import java.io.IOException;
-
-/**
- * @author Vladislav.Soroka
- */
-@SuppressWarnings("unused")
-public final class ToolingStreamUtils extends ToolingStreamApiUtils {
-  public static ExternalDependency readDependency(@NotNull IonReader reader, @NotNull ReadContext context) {
-    return ExternalProjectSerializationService.readDependency(reader, context);
-  }
-
-  public static void writeDependency(@NotNull IonWriter writer,
-                                     @NotNull WriteContext context,
-                                     @NotNull ExternalDependency dependency) throws IOException {
-    ExternalProjectSerializationService.writeDependency(writer, context, dependency);
-  }
-}