diff --git a/jython-java8compat.patch b/jython-java8compat.patch
new file mode 100644
index 0000000..f6585c1
--- /dev/null
+++ b/jython-java8compat.patch
@@ -0,0 +1,55 @@
+diff --git a/build.xml b/build.xml
+index 52dfe71..43d7649 100644
+--- a/build.xml
++++ b/build.xml
+@@ -91,8 +91,8 @@ informix.jar = ../support/jdbc-4.10.12.jar
+ 
+         <property file="${user.home}/ant.properties" />
+         <property file="${basedir}/ant.properties" />
+-        <property name="jython.java.version" value="1.8" />
+-        <property name="jdk.source.version" value="1.8" />
++        <property name="jython.java.version" value="8" />
++        <property name="jdk.source.version" value="8" />
+ 
+         <!-- Designate the official release encoded in parts. In normal times, this is the *next*
+              official release, e.g. 2.7.2b2 while working towards 2.7.2b2, and sys.version will be
+@@ -681,6 +681,7 @@ The text for an official release would continue like ...
+                 destdir="${compile.dir}"
+                 target="${jdk.target.version}"
+                 source="${jdk.source.version}"
++                release="${jdk.target.version}"
+                 debug="${debug}"
+                 deprecation="${deprecation}"
+                 nowarn="${nowarn}"
+@@ -743,6 +744,7 @@ The text for an official release would continue like ...
+         <javac destdir="${compile.dir}"
+                target="${jdk.target.version}"
+                source="${jdk.source.version}"
++               release="${jdk.target.version}"
+                debug="${debug}"
+                deprecation="${deprecation}"
+                nowarn="${nowarn}"
+@@ -763,6 +765,7 @@ The text for an official release would continue like ...
+                destdir="${compile.dir}"
+                target="${jdk.target.version}"
+                source="${jdk.source.version}"
++               release="${jdk.target.version}"
+                debug="${debug}"
+                deprecation="${deprecation}"
+                nowarn="${nowarn}"
+@@ -795,6 +798,7 @@ The text for an official release would continue like ...
+                destdir="${test.compile.dir}"
+                target="${jdk.target.version}"
+                source="${jdk.source.version}"
++               release="${jdk.target.version}"
+                debug="${debug}"
+                deprecation="${deprecation}"
+                nowarn="${nowarn}"
+@@ -1209,6 +1213,7 @@ The text for an official release would continue like ...
+                destdir="${compile.dir}"
+                target="${jdk.target.version}"
+                source="${jdk.source.version}"
++               release="${jdk.target.version}"
+                debug="${debug}"
+                deprecation="${deprecation}"
+                nowarn="${nowarn}"
diff --git a/jython-reproducible-builds.patch b/jython-reproducible-builds.patch
new file mode 100644
index 0000000..452821b
--- /dev/null
+++ b/jython-reproducible-builds.patch
@@ -0,0 +1,43 @@
+diff --git a/build.xml b/build.xml
+index 52dfe71..0d41bdf 100644
+--- a/build.xml
++++ b/build.xml
+@@ -721,8 +721,12 @@ The text for an official release would continue like ...
+             <arg path="${out}"/>
+             <arg value="-lib"/>
+             <arg path="${out}"/>
+-            <arg file="${basedir}/grammar/Python.g"/>
+-            <arg file="${basedir}/grammar/PythonPartial.g"/>
++            <!-- Reproducible builds
++                 Replace 'arg file=...' with 'arg value=...' to prevent using
++                 the absolute filename, because these filenames are inserted
++                 into the antlr generated getGrammar* methods -->
++            <arg value="grammar/Python.g"/>
++            <arg value="grammar/PythonPartial.g"/>
+             <classpath refid="main.classpath"/>
+         </java>
+ 
+@@ -1151,7 +1155,10 @@ The text for an official release would continue like ...
+     </target>
+ 
+     <target name="copy-lib" depends="common-dirs, copy-cpythonlib">
+-        <copy todir="${dist.dir}/Lib">
++        <!-- Reproducible builds
++             Use attribute preservelastmodified="true" because these files'
++             mtime are stored into the generated $py.class files -->
++        <copy todir="${dist.dir}/Lib" preservelastmodified="true">
+             <fileset dir="${basedir}/Lib">
+                 <exclude name="**/*.class"/>
+             </fileset>
+@@ -1175,7 +1182,10 @@ The text for an official release would continue like ...
+         <copy file="${basedir}/lib-python/LICENSE.txt"
+               tofile="${dist.dir}/LICENSE_CPython.txt"
+               preservelastmodified="true" />
+-        <copy todir="${dist.dir}/Lib">
++        <!-- Reproducible builds
++             Use attribute preservelastmodified="true" because these files'
++             mtime are stored into the generated $py.class files -->
++        <copy todir="${dist.dir}/Lib" preservelastmodified="true">
+             <fileset dir="${python.lib}" excludes="**/*.pyc, **/*.pyo" includesfile="${basedir}/CPythonLib.includes">
+                 <!-- The include file gets all of lib-python/2.7's test directory, but we only want the ones from Jython's Lib.   -->
+                 <present present="srconly" targetdir="${basedir}/Lib"/>
diff --git a/jython-reproducible-now.patch b/jython-reproducible-now.patch
new file mode 100644
index 0000000..d785277
--- /dev/null
+++ b/jython-reproducible-now.patch
@@ -0,0 +1,40 @@
+diff --git a/src/org/python/modules/posix/PosixModule.java b/src/org/python/modules/posix/PosixModule.java
+index e3a8dd9..07d4b43 100644
+--- a/src/org/python/modules/posix/PosixModule.java
++++ b/src/org/python/modules/posix/PosixModule.java
+@@ -1144,7 +1144,7 @@ public class PosixModule implements ClassDictInit {
+         if (times == Py.None) {
+             // FIXME dynamically bind to java.time.Instant, available in Java 8,
+             // to potentially get higher resolution (nanosecond) time
+-            atime = mtime = FileTime.from(
++            atime = mtime = FileTime.from(System.getenv("SOURCE_DATE_EPOCH") != null ? 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH")) :
+                     System.currentTimeMillis(), TimeUnit.MILLISECONDS);
+         } else if (times instanceof PyTuple && times.__len__() == 2) {
+             atime = getFileTime(times.__getitem__(0));
+diff --git a/src/org/python/modules/random/PyRandom.java b/src/org/python/modules/random/PyRandom.java
+index f5ea8d9..0dc4881 100644
+--- a/src/org/python/modules/random/PyRandom.java
++++ b/src/org/python/modules/random/PyRandom.java
+@@ -45,7 +45,7 @@ public class PyRandom extends PyObject {
+     final void Random_seed(PyObject seed) {
+         long n;
+         if (seed == null) {
+-            seed = new PyLong(System.currentTimeMillis());
++            seed = new PyLong(System.getenv("SOURCE_DATE_EPOCH") != null ? 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH")) : System.currentTimeMillis());
+         }
+         if (seed instanceof PyLong) {
+             PyLong max = new PyLong(Long.MAX_VALUE);
+diff --git a/src/org/python/modules/time/Time.java b/src/org/python/modules/time/Time.java
+index ebd9871..cf2218d 100644
+--- a/src/org/python/modules/time/Time.java
++++ b/src/org/python/modules/time/Time.java
+@@ -131,6 +131,9 @@ public class Time implements ClassDictInit
+     }
+ 
+     public static double time() {
++        if (System.getenv("SOURCE_DATE_EPOCH") != null) {
++            return Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
++        }
+         return System.currentTimeMillis()/1000.0;
+     }
+ 
diff --git a/jython.changes b/jython.changes
index 184d55f..975a745 100644
--- a/jython.changes
+++ b/jython.changes
@@ -1,3 +1,17 @@
+-------------------------------------------------------------------
+Mon Sep 25 16:49:29 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Added patches:
+  * jython-java8compat.patch
+    + use release=8 on compilers that support it
+  * jython-reproducible-builds.patch
+    + preserve mtimes of files since they get embedded in the
+      resultiong class files
+    + use relative paths of files that get included in antlr
+      getGrammar* methods
+  * jython-reproducible-now.patch
+    + use SOURCE_DATE_EPOCH for "now" if the variable is set
+
 -------------------------------------------------------------------
 Wed Jun 28 10:40:43 UTC 2023 - Pedro Monreal <pmonreal@suse.com>
 
diff --git a/jython.spec b/jython.spec
index b2edb85..1247cae 100644
--- a/jython.spec
+++ b/jython.spec
@@ -32,6 +32,9 @@ Patch0:         %{name}-build.patch
 Patch1:         %{name}-dont-validate-pom.patch
 Patch2:         %{name}-cachedir.patch
 Patch3:         %{name}-fix-tty-detection.patch
+Patch4:         %{name}-reproducible-now.patch
+Patch5:         %{name}-reproducible-builds.patch
+Patch6:         %{name}-java8compat.patch
 BuildRequires:  ant
 BuildRequires:  ant-junit
 BuildRequires:  antlr3-java