diff --git a/java-firestore/google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java b/java-firestore/google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java
index 12f746f83654..fd70b7c92850 100644
--- a/java-firestore/google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java
+++ b/java-firestore/google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java
@@ -157,6 +157,7 @@
 import java.util.concurrent.TimeoutException;
 import java.util.stream.Collectors;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -3625,6 +3626,7 @@ public void testStrContains() throws Exception {
             map("title", "The Hitchhiker's Guide to the Galaxy"));
   }
 
+  @Ignore("Flaky test: b/579437181")
   @Test
   public void testSubstring() throws Exception {
     List<PipelineResult> results =