diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index ec34557..e82e2cf 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -7,12 +7,6 @@ platforms:
     test_targets:
       - //...
 
-  ubuntu1604:
-    build_targets:
-      - //...
-    test_targets:
-      - //...
-
   ubuntu1804:
     build_targets:
       - //...
diff --git a/.bazelignore b/.bazelignore
new file mode 100644
index 0000000..9da6d50
--- /dev/null
+++ b/.bazelignore
@@ -0,0 +1,2 @@
+# //third_party conatins git submodules.
+third_party/