diff --git a/arduino.spec b/arduino.spec
index a8d58da..d40e0df 100644
--- a/arduino.spec
+++ b/arduino.spec
@@ -2,14 +2,14 @@
 %define        longversion  %(echo 0%version | tr -d .)
 
 Name:          arduino
-Version:       1.8.13
+Version:       1.8.15
 Release:       1mamba
 Summary:       The open-source Arduino environment
 Group:         Graphical Desktop/Applications/Development
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Stefano Cotta Ramusino <stefano.cotta@openmamba.org>
-URL:           http://www.arduino.cc/en/Main/software
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://www.arduino.cc/en/software/
 Source:        https://github.com/arduino/Arduino.git/%{version}/Arduino-%{version}.tar.bz2
 Source1:       arduino-1.0.1-icons.tar.xz
 Patch0:        arduino-1.0.1-script.patch
@@ -19,17 +19,18 @@ Patch1:        arduino-1.0-use_system_rxtx.patch
 Patch2:        arduino-1.0-etc.patch
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: java-rxtx
-BuildRequires: ldconfig
+BuildRequires: glibc-devel
+BuildRequires: libgcc
+BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
 BuildRequires: apache-ant
-BuildRequires: jpackage-utils
+BuildRequires: javapackages
+Requires:      java-openjdk8-runtime
 Requires:      cross-avr-gcc
 Requires:      avr-libc
 Requires:      avrdude
 Requires:      java-rxtx
-Obsoletes:     arduino.noarch
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+Obsoletes:     arduino.noarch < 1.8.15
 
 %description
 The open-source Arduino environment makes it easy to write code and upload it to the Arduino i/o board.
@@ -52,6 +53,7 @@ tar xf %{SOURCE1}
 #build-jar-repository -p -s app/lib/ ecj jna RXTXcomm
 
 %build
+export JAVA_HOME=%{_jvmdir}/java-8
 %ifarch x86_64
 export platform=linux64
 %endif
@@ -65,20 +67,10 @@ export LD_PRELOAD=/usr/lib/libatomic.so
 
 cd build
 
-count=0
-set +e
-while [[ count -lt 5 ]]; do
-# Workaround for java random crashes on build servers
-count=$((count+1))
-#(cd core/methods; ant)
-#(cd core; ant)
 ant -Djava.net.preferIPv4Stack=true -Dplatform=${platform} dist << __END
 
 __END
-[ $? -eq 0 ] && break
-done
-[ $? -ne 0 ] && exit 1
-set -e
+
 tar -xf linux/arduino-%{version}-${platform}.tar.xz
 
 %install
@@ -128,6 +120,9 @@ done
 %doc %{_defaultdocdir}/arduino-%{version}/reference
 
 %changelog
+* Wed May 19 2021 Automatic Build System <autodist@mambasoft.it> 1.8.15-1mamba
+- automatic version update by autodist
+
 * Sat Jul 11 2020 Automatic Build System <autodist@mambasoft.it> 1.8.13-1mamba
 - automatic version update by autodist