diff --git a/ivy.xml b/ivy.xml
index 3ba878a1..e6ee31fa 100644
--- a/ivy.xml
+++ b/ivy.xml
@@ -42,25 +42,26 @@
         <artifact name="ivy" type="jar" conf="core"/>
         <artifact name="ivy" type="source" ext="jar" conf="source"/>
     </publications>
+    <!-- Definition of the version is done in version.properties -->
     <dependencies>
-        <dependency org="org.apache.ant" name="ant" rev="1.9.9" conf="default,ant"/>
-        <dependency org="org.apache.httpcomponents" name="httpclient" rev="4.5.3" conf="default,httpclient->runtime,master"/>
-        <dependency org="oro" name="oro" rev="2.0.8" conf="default,oro"/>
-        <dependency org="org.apache.commons" name="commons-vfs2" rev="2.1" conf="default,vfs"/>
-        <dependency org="com.jcraft" name="jsch" rev="0.1.54" conf="default,sftp"/>
-        <dependency org="com.jcraft" name="jsch.agentproxy" rev="0.0.9" conf="default,sftp"/>
-        <dependency org="com.jcraft" name="jsch.agentproxy.connector-factory" rev="0.0.9" conf="default,sftp"/>
-        <dependency org="com.jcraft" name="jsch.agentproxy.jsch" rev="0.0.9" conf="default,sftp"/>
-        <dependency org="org.bouncycastle" name="bcpg-jdk15on" rev="1.58" conf="default"/>
-        <dependency org="org.bouncycastle" name="bcprov-jdk15on" rev="1.58" conf="default"/>
+        <dependency org="org.apache.ant" name="ant" rev="${apache-ant.version}" conf="default,ant"/>
+        <dependency org="org.apache.httpcomponents" name="httpclient" rev="${httpclient.version}" conf="default,httpclient->runtime,master"/>
+        <dependency org="oro" name="oro" rev="${oro.version}" conf="default,oro"/>
+        <dependency org="org.apache.commons" name="commons-vfs2" rev="${commons-vfs2.version}" conf="default,vfs"/>
+        <dependency org="com.jcraft" name="jsch" rev="${jsch.version}" conf="default,sftp"/>
+        <dependency org="com.jcraft" name="jsch.agentproxy" rev="${jsch.agentproxy.version}" conf="default,sftp"/>
+        <dependency org="com.jcraft" name="jsch.agentproxy.connector-factory" rev="${jsch.agentproxy.version}" conf="default,sftp"/>
+        <dependency org="com.jcraft" name="jsch.agentproxy.jsch" rev="${jsch.agentproxy.version}" conf="default,sftp"/>
+        <dependency org="org.bouncycastle" name="bcpg-jdk15on" rev="${bouncycastle.version}" conf="default"/>
+        <dependency org="org.bouncycastle" name="bcprov-jdk15on" rev="${bouncycastle.version}" conf="default"/>
 
         <!-- Test dependencies -->
-        <dependency org="junit" name="junit" rev="4.12" conf="test"/>
-        <dependency org="org.hamcrest" name="hamcrest-core" rev="1.3" conf="test"/>
-        <dependency org="org.apache.ant" name="ant-testutil" rev="1.9.9" conf="test" transitive="false"/>
-        <dependency org="org.apache.ant" name="ant-launcher" rev="1.9.9" conf="test" transitive="false"/>
-        <dependency org="ant-contrib" name="ant-contrib" rev="1.0b3" conf="test" transitive="false"/>
-        <dependency org="xmlunit" name="xmlunit" rev="1.6" conf="test" transitive="false"/>
+        <dependency org="junit" name="junit" rev="${junit.version}" conf="test"/>
+        <dependency org="org.hamcrest" name="hamcrest-core" rev="${hamcrest.version}" conf="test"/>
+        <dependency org="org.apache.ant" name="ant-testutil" rev="${apache-ant.version}" conf="test" transitive="false"/>
+        <dependency org="org.apache.ant" name="ant-launcher" rev="${apache-ant.version}" conf="test" transitive="false"/>
+        <dependency org="ant-contrib" name="ant-contrib" rev="${ant-contrib.version}" conf="test" transitive="false"/>
+        <dependency org="xmlunit" name="xmlunit" rev="${xmlunit.version}" conf="test" transitive="false"/>
 
         <!-- Global excludes -->
         <exclude org="junit" module="junit" conf="core,default,httpclient,oro,vfs,sftp,standalone,ant"/>
diff --git a/version.properties b/version.properties
index 394de0fb..7b1a0bae 100644
--- a/version.properties
+++ b/version.properties
@@ -22,3 +22,20 @@ target.ivy.bundle.version=2.5.0
 # in case we want to add a qualifier such as alpha, beta, etc...
 # if non empty, add a '_' at the end of the qualifier, so the version would look like 1.2.3.alpha_200901011200
 target.ivy.bundle.version.qualifier=alpha_
+
+
+# Versions of dependencies
+#----------------------------------
+# 'ant.version' is a built in name containing the version of the current 
+# running Ant, so we could not use that name here.
+apache-ant.version=1.9.9
+ant-contrib.version=1.0b3
+bouncycastle.version=1.58
+commons-vfs2.version=2.1
+hamcrest.version=1.3
+httpclient.version=4.5.3
+jsch.agentproxy.version=0.0.9
+jsch.version=0.1.54
+junit.version=4.12
+oro.version=2.0.8
+xmlunit.version=1.6
\ No newline at end of file