Index: trunk/tools/ivy.xml
===================================================================
--- trunk/tools/ivy.xml	(revision 19499)
+++ trunk/tools/ivy.xml	(revision 19517)
@@ -17,19 +17,19 @@
         <dependency org="net.java.dev.javacc" name="javacc" rev="7.0.13" conf="javacc->default"/>
         <!-- checkstyle->default -->
-        <dependency org="com.puppycrawl.tools" name="checkstyle" rev="10.21.2" conf="checkstyle->default"/>
+        <dependency org="com.puppycrawl.tools" name="checkstyle" rev="${versions.checkstyle}" conf="checkstyle->default"/>
         <!-- proguard->default -->
-        <dependency org="com.guardsquare" name="proguard-ant" rev="7.6.1" conf="proguard->default"/>
+        <dependency org="com.guardsquare" name="proguard-ant" rev="7.8.2" conf="proguard->default"/>
         <!-- pmd->default -->
-        <dependency org="net.sourceforge.pmd" name="pmd-core" rev="7.10.0" conf="pmd->default"/>
-        <dependency org="net.sourceforge.pmd" name="pmd-ant" rev="7.10.0" conf="pmd->default"/>
-        <dependency org="net.sourceforge.pmd" name="pmd-java" rev="7.10.0" conf="pmd->default"/>
-        <dependency org="org.xmlresolver" name="xmlresolver" rev="6.0.12" conf="pmd->default"/>
+        <dependency org="net.sourceforge.pmd" name="pmd-core" rev="7.21.0" conf="pmd->default"/>
+        <dependency org="net.sourceforge.pmd" name="pmd-ant" rev="7.21.0" conf="pmd->default"/>
+        <dependency org="net.sourceforge.pmd" name="pmd-java" rev="7.21.0" conf="pmd->default"/>
+        <dependency org="org.xmlresolver" name="xmlresolver" rev="6.0.21" conf="pmd->default"/>
         <!-- spotbugs->default -->
-        <dependency org="com.github.spotbugs" name="spotbugs" rev="4.9.0" conf="spotbugs->default"/>
-        <dependency org="com.github.spotbugs" name="spotbugs-ant" rev="4.9.0" conf="spotbugs->default"/>
+        <dependency org="com.github.spotbugs" name="spotbugs" rev="4.9.8" conf="spotbugs->default"/>
+        <dependency org="com.github.spotbugs" name="spotbugs-ant" rev="4.9.8" conf="spotbugs->default"/>
         <!-- errorprone->default -->
         <dependency org="com.google.errorprone" name="error_prone_core" rev="2.47.0" conf="errorprone->default"/>
         <!-- animal->default -->
-        <dependency org="org.codehaus.mojo" name="animal-sniffer-ant-tasks" rev="1.24" conf="animal->default"/>
+        <dependency org="org.codehaus.mojo" name="animal-sniffer-ant-tasks" rev="1.27" conf="animal->default"/>
     </dependencies>
 </ivy-module>