diff --git a/build.xml b/build.xml
index 31ba080..79e65a9 100644
--- a/build.xml
+++ b/build.xml
@@ -13,7 +13,7 @@
   <!-- Fill me please / todo 
        see fetch_dependencies
   -->
-  <property name="zstd-jnilib" value="zstd-jni-1.5.2-2"/>
+  <property name="zstd-jnilib" value="zstd-jni-1.5.7-6"/>
   <target name="gather_project_params">
     <!-- original source parameter is in project_params project_version -->
     <loadfile property="distversion" srcfile="${basedir}/project_params">
diff --git a/fetch_dependencies.sh b/fetch_dependencies.sh
index ea6b6bc..7e32f3f 100755
--- a/fetch_dependencies.sh
+++ b/fetch_dependencies.sh
@@ -10,6 +10,12 @@ toolsdir=$(pwd)
 source metascript.sh
 popd >/dev/null
 
+usage() {
+    cat <<EOF
+    $0 use_jackson|use_zstd|use_artgraphic
+EOF
+}
+
 fetch_jackson_databind()
 {
     lib_jackson_databind=jackson-databind-${libversion_jackson_databind}.jar
@@ -24,17 +30,27 @@ fetch_jackson_databind()
 
 fetch_zstd-jni()
 {
-
     # echo "compiled from https://github.com/luben/zstd-jni commit 54d3d50c16d96bd8a30e2d4c0a9648001a52d6f9"
     # had to hack through jar generation ...
     # cp ~/artisanlogiciel/ext_projects/java/zstd-jni/target/zstd-jni-1.5.2-2.jar .
-    $defer pushd libs    
-    $metarun wget https://repo1.maven.org/maven2/com/github/luben/zstd-jni/${libversion_zstdjni}/zstd-jni-${libversion_zstdjni}.jar
-    $defer popd
+    maven_repo=https://repo1.maven.org/maven2/
+    package_path=com/github/luben/zstd-jni/
+    # https://repo1.maven.org/maven2/maven-metadata.xml
+    latest=$(curl -s ${maven_repo}${package_path}maven-metadata.xml | xmllint --xpath 'string(metadata/versioning/latest)' -)
+    log_info "latest version : $latest"
+    zstdjni=$(xmllint --xpath 'string(/project/property[@name="zstd-jnilib"]/@value)' build.xml)    
+    if [[ -n $zstdjni ]]
+    then
+	$defer pushd libs
+	libversion_zstdjni=${zstdjni/zstd-jni-}
+	$metarun curl ${maven_repo}${package_path}${libversion_zstdjni}/${zstdjni}.jar -o ${zstdjni}.jar
+	$defer popd
+    else
+	log_error 'no /project/property[@name="zstd-jnilib"]/@value) found in build.xml'
+    fi
 }
 
 # HARDCODED START
-libversion_zstdjni=1.5.2-2
 libversion_jackson_databind=2.12.0
 sharedrawweb_git_url="https://framagit.org/artlog/sharedrawweb.git"
 libversion_artgaphic=0.2.0
@@ -65,12 +81,6 @@ do
 done
 
 
-if [[ ! -d sharedrawweb ]]
-then
-    log_error "expected a sharedrawweb project parent ( for exports ). Please clone related project."
-    log_info "git clone $sharedrawweb_git_url sharedrawweb"
-fi
-
 if [[ ! -d libs ]]
 then
     $metarun mkdir libs
@@ -78,6 +88,11 @@ fi
 
 if [[ -n $user_artgraphic ]]
 then
+    if [[ ! -d sharedrawweb ]]
+    then
+	log_error "expected a sharedrawweb project parent ( for exports ). Please clone related project."
+	log_info "git clone $sharedrawweb_git_url sharedrawweb"
+    fi
     if [[ ! -e libs/$lib_artgaphic ]]
     then
 	lib_artgaphic_source_file=sharedrawweb/dist/lib/$lib_artgaphic