Index: /trunk/tools/ivy.xml
===================================================================
--- /trunk/tools/ivy.xml	(revision 19300)
+++ /trunk/tools/ivy.xml	(revision 19301)
@@ -29,5 +29,5 @@
         <dependency org="com.github.spotbugs" name="spotbugs-ant" rev="4.9.0" conf="spotbugs->default"/>
         <!-- errorprone->default -->
-        <dependency org="com.google.errorprone" name="error_prone_core" rev="2.36.0" conf="errorprone->default"/>
+        <dependency org="com.google.errorprone" name="error_prone_core" rev="2.31.0" conf="errorprone->default"/>
         <!-- animal->default -->
         <dependency org="org.codehaus.mojo" name="animal-sniffer-ant-tasks" rev="1.24" conf="animal->default"/>