diff --git a/content/org/webjars/highcharts/README.md b/content/org/webjars/highcharts/README.md
index 1c8292255e..08f99cc012 100644
--- a/content/org/webjars/highcharts/README.md
+++ b/content/org/webjars/highcharts/README.md
@@ -7,13 +7,13 @@
 
 Source code: [https://github.com/webjars/highcharts.git](https://github.com/webjars/highcharts.git)
 
-rebuilding **3 releases** of org.webjars:highcharts:
-- **3** releases were found successfully **fully reproducible** (100% reproducible artifacts :white_check_mark:),
+rebuilding **4 releases** of org.webjars:highcharts:
+- **4** releases were found successfully **fully reproducible** (100% reproducible artifacts :white_check_mark:),
 - 0 had issues (some unreproducible artifacts :warning:, see eventual :mag: diffoscope and/or :memo: issue tracker links):
 
 | version | [build spec](/BUILDSPEC.md) | [result](https://reproducible-builds.org/docs/jvm/): reproducible? | size |
 | -- | --------- | ------ | -- |
-| [12.1.0](https://central.sonatype.com/artifact/org.webjars/highcharts/12.1.0/pom) | | | |
+| [12.1.0](https://central.sonatype.com/artifact/org.webjars/highcharts/12.1.0/pom) | [mvn jdk21](highcharts-12.1.0.buildspec) | [result](highcharts-12.1.0.buildinfo): [2 :white_check_mark: ](highcharts-12.1.0.buildcompare) | 30M |
 | [11.2.0](https://central.sonatype.com/artifact/org.webjars/highcharts/11.2.0/pom) | [mvn jdk8](highcharts-11.2.0.buildspec) | [result](highcharts-11.2.0.buildinfo): [2 :white_check_mark: ](highcharts-11.2.0.buildcompare) | 23M |
 | [11.1.0](https://central.sonatype.com/artifact/org.webjars/highcharts/11.1.0/pom) | [mvn jdk8](highcharts-11.1.0.buildspec) | [result](highcharts-11.1.0.buildinfo): [2 :white_check_mark: ](highcharts-11.1.0.buildcompare) | 19M |
 | [10.3.3](https://central.sonatype.com/artifact/org.webjars/highcharts/10.3.3/pom) | [mvn jdk17](highcharts-10.3.3.buildspec) | [result](highcharts-10.3.3.buildinfo): [2 :white_check_mark: ](highcharts-10.3.3.buildcompare) | 20M |
diff --git a/content/org/webjars/highcharts/highcharts-12.1.0.buildcompare b/content/org/webjars/highcharts/highcharts-12.1.0.buildcompare
new file mode 100644
index 0000000000..0fe72473e4
--- /dev/null
+++ b/content/org/webjars/highcharts/highcharts-12.1.0.buildcompare
@@ -0,0 +1,9 @@
+version=12.1.0
+ok=2
+ko=0
+ignored=0
+okFiles="highcharts-12.1.0.pom highcharts-12.1.0.jar"
+koFiles=""
+ignoredFiles=""
+reference_java_version="21 (from MANIFEST.MF Build-Jdk-Spec)"
+reference_os_name="Unix (from pom.properties newline)"
diff --git a/content/org/webjars/highcharts/highcharts-12.1.0.buildinfo b/content/org/webjars/highcharts/highcharts-12.1.0.buildinfo
new file mode 100644
index 0000000000..8c5bf0e356
--- /dev/null
+++ b/content/org/webjars/highcharts/highcharts-12.1.0.buildinfo
@@ -0,0 +1,32 @@
+# https://reproducible-builds.org/docs/jvm/
+buildinfo.version=1.0-SNAPSHOT
+
+name=Highcharts
+group-id=org.webjars
+artifact-id=highcharts
+version=12.1.0
+
+# source information
+source.scm.uri=scm:git:https://github.com/webjars/highcharts.git
+source.scm.tag=highcharts-12.1.0
+
+# build instructions
+build-tool=mvn
+
+# build environment information (simplified for reproducibility)
+java.version=21
+os.name=Unix
+
+# Maven rebuild instructions and effective environment
+
+# output
+
+outputs.0.groupId=org.webjars
+outputs.0.filename=highcharts-12.1.0.pom
+outputs.0.length=4916
+outputs.0.checksums.sha512=7a19770c9d02a4f3bcf2548dcaa3a8aee904d6bf5f6537fbc7d9e04cd2eda4630e7da16534e5cdca2f2bd89684099dbf25a05d01857e7e454483e1c922cff0d2
+
+outputs.1.groupId=org.webjars
+outputs.1.filename=highcharts-12.1.0.jar
+outputs.1.length=31358325
+outputs.1.checksums.sha512=b5fd660bd9fea276faf3448f906106095233afc68ea8246d2d3a53194ecf503509630f5ffe746906d1cd630465195d924dbf8f18daee345b562f3239b9fbd1c1
diff --git a/content/org/webjars/highcharts/highcharts-12.1.0.buildspec b/content/org/webjars/highcharts/highcharts-12.1.0.buildspec
new file mode 100644
index 0000000000..4893b24378
--- /dev/null
+++ b/content/org/webjars/highcharts/highcharts-12.1.0.buildspec
@@ -0,0 +1,18 @@
+groupId=org.webjars
+artifactId=highcharts
+version=12.1.0
+
+display=${groupId}:${artifactId}
+
+gitRepo=https://github.com/webjars/${artifactId}.git
+gitTag=${artifactId}-${version}
+
+tool=mvn
+jdk=21
+newline=lf
+
+command="mvn clean package -DskipTests -Dmaven.javadoc.skip -Dgpg.skip"
+buildinfo=target/${artifactId}-${version}.buildinfo
+
+#diffoscope=${artifactId}-${version}.diffoscope
+issue=