diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 37283ed..b515393 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,6 +18,5 @@ deploy:jdk8:
     - apt update
     - apt -y install ant make gcc gcc-multilib mingw-w64 mingw-w64-tools mingw-w64-i686-dev mingw-w64-x86-64-dev openjdk-11-jdk libayatana-appindicator3-dev libnotify-dev
     - git submodule update --init --recursive
-    - curl https://repo1.maven.org/maven2/org/apache/ivy/ivy/2.5.2/ivy-2.5.2.jar --create-dirs -o "${HOME}/.ant/lib/ivy.jar"
     - make install
     
diff --git a/build.xml b/build.xml
index 8f32fc5..c69fd1a 100644
--- a/build.xml
+++ b/build.xml
@@ -26,6 +26,13 @@
 	<property name="clib" value="clib"/>
 	<property name="resources" value="resources"/>
 	<property name="classpath" value="lib/commons-jxpath-1.1.jar;lib/commons-logging-1.2.jar;lib/bcprov-jdk15on-1.70.jar;lib/junit-4.5.jar;lib/commons-codec-1.3.jar;lib/swing-layout-1.0.3.jar;lib/WaifUPnP.jar;lib/flatlaf-3.1.1.jar"/> 
+	<property name="ivy.install.version" value="2.5.2"/>
+	<condition property="ivy.home" value="${env.IVY_HOME}">
+		<isset property="env.IVY_HOME"/>
+	</condition>
+	<property name="ivy.home" value="${user.home}/.ant"/>
+	<property name="ivy.jar.dir" value="${ivy.home}/lib"/>
+	<property name="ivy.jar.file" value="${ivy.jar.dir}/ivy.jar"/>
 
 	<target name="init">
 		<mkdir dir="${build}"/>
@@ -57,9 +64,21 @@
 		<copy file="3rdparty/WaifUPnP/dist/WaifUPnP.jar" tofile="lib/WaifUPnP.jar"/>
 	</target> 
 
-	<target name="resolve">
+	<target name="resolve" depends="init-ivy">
 		<ivy:retrieve/>
-	</target> 
+	</target>
+
+	<target name="init-ivy" depends="download-ivy">
+		<path id="ivy.lib.path">
+			<fileset dir="${ivy.jar.dir}" includes="*.jar"/>
+		</path>
+		<taskdef resource="org/apache/ivy/ant/antlib.xml" uri="antlib:org.apache.ivy.ant" classpathref="ivy.lib.path"/>
+	</target>
+
+	<target name="download-ivy" unless="offline">
+		<mkdir dir="${ivy.jar.dir}"/>
+		<get src="https://repo1.maven.org/maven2/org/apache/ivy/ivy/${ivy.install.version}/ivy-${ivy.install.version}.jar" dest="${ivy.jar.file}" usetimestamp="true"/>
+	</target>
 
 	<target name="jar" depends="compile">
 		<mkdir dir="${build}/lib"/>