diff --git a/.gitignore b/.gitignore
index 6b6051c..561c926 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,59 @@
+build/
+target/
+!.mvn/wrapper/maven-wrapper.jar
+.DS_Store
+out/
+generated/
+generated_tests/
+generated-resources-dir/
+bin/
+*.swp
+
+# python
+__pycache__
+venv
+.pyc
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+*.log*
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.gradle/*
+
+### IntelliJ IDEA ###
 .idea
-.gradle
-build
-profilers
-testdata
-hotspot_*.log
\ No newline at end of file
+*.iws
+*.iml
+*.ipr
+#### Intellij run configuration
+.run/
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+*/.gradle/*
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index dd01eaf..dd20cd0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,4 @@
 import me.champeau.jmh.JmhBytecodeGeneratorTask
-import org.ajoberstar.grgit.Grgit
 import org.gradle.internal.os.OperatingSystem
 
 import java.time.Duration
@@ -8,9 +7,8 @@ plugins {
     id 'java'
     id 'scala'
     id 'me.champeau.jmh' version '0.7.1'
-    id 'org.ajoberstar.grgit' version '5.2.0'
-    id 'pl.allegro.tech.build.axion-release' version '1.15.5'
-    id 'io.github.gradle-nexus.publish-plugin' version '1.3.0'
+    id 'pl.allegro.tech.build.axion-release' version '1.21.1'
+    id 'io.github.gradle-nexus.publish-plugin' version '2.0.0'
     id 'maven-publish'
     id 'signing'
 }
@@ -18,7 +16,8 @@ plugins {
 scmVersion {
     versionCreator('versionWithBranch')
     tag {
-        prefix = ''
+        // Property<String> in newer versions
+        prefix.set('')
     }
 }
 
@@ -62,20 +61,43 @@ dependencies {
     testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: junitVersion
 }
 
-tasks.register('downloadTestData') {
-    doFirst {
-        def testDataDir = new File("${project.projectDir.getAbsolutePath()}/testdata")
-        if (!testDataDir.exists()) {
-            testDataDir.mkdir()
-        }
-        def numbersTestDataDir = new File("${testDataDir}/parse-number-fxx-test-data")
-        if (!numbersTestDataDir.exists()) {
-            def grgit = Grgit.clone(dir: numbersTestDataDir, uri: 'https://github.com/nigeltao/parse-number-fxx-test-data.git')
-            grgit.close()
+def testdataParent = layout.projectDirectory.dir("testdata")
+def repoDir = testdataParent.dir("parse-number-fxx-test-data")
+
+tasks.register('prepareTestDataDir') {
+    description = 'Create testdata/ directory if missing'
+    doLast {
+        def parent = testdataParent.asFile
+        if (!parent.exists()) {
+            logger.lifecycle("Creating ${parent}")
+            parent.mkdirs()
         }
     }
 }
 
+tasks.register('downloadTestData', Exec) {
+    description = 'Clone parse-number-fxx-test-data into testdata/ if missing'
+    group = 'verification'
+    dependsOn tasks.named('prepareTestDataDir')
+
+    // Run if repo dir missing OR empty (handles half-created directories)
+    onlyIf {
+        def d = repoDir.asFile
+        !d.exists() || (d.isDirectory() && (d.listFiles() == null || d.listFiles().length == 0))
+    }
+
+    workingDir testdataParent.asFile
+    commandLine 'git', 'clone', 'https://github.com/nigeltao/parse-number-fxx-test-data.git', 'parse-number-fxx-test-data'
+
+    doFirst {
+        logger.lifecycle("Cloning parse-number-fxx-test-data into ${repoDir.asFile}")
+    }
+}
+
+tasks.withType(Test).configureEach {
+    dependsOn tasks.named('downloadTestData')
+}
+
 tasks.register('test256', Test) {
     dependsOn downloadTestData
     useJUnitPlatform()
@@ -103,8 +125,18 @@ tasks.register('test512', Test) {
 }
 
 test {
+    // run JUnit 5 tests
+    useJUnitPlatform()
+
+    jvmArgs += [
+            '--add-modules', 'jdk.incubator.vector', '-Xmx2g'
+    ]
+    // still run the vector-width-specific tasks first
     dependsOn 'test256'
     dependsOn 'test512'
+
+    // and don't blow up if this particular task finds nothing
+    failOnNoDiscoveredTests = false
 }
 
 tasks.withType(JmhBytecodeGeneratorTask).configureEach {
@@ -206,15 +238,21 @@ if (System.getenv('GPG_KEY_ID')) {
 nexusPublishing {
     repositories {
         sonatype {
-            nexusUrl = uri("https://ossrh-staging-api.central.sonatype.com/service/local/")
-            snapshotRepositoryUrl = uri("https://central.sonatype.com/repository/maven-snapshots/")
-            stagingProfileId = '3c0bbfe420699e'
-            username = System.getenv('SONATYPE_USERNAME')
-            password = System.getenv('SONATYPE_PASSWORD')
+            nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
+
+            if (System.getenv('SONATYPE_USERNAME')) {
+                username.set(System.getenv('SONATYPE_USERNAME'))
+            }
+            if (System.getenv('SONATYPE_PASSWORD')) {
+                password.set(System.getenv('SONATYPE_PASSWORD'))
+            }
+
+            stagingProfileId.set('3c0bbfe420699e')
         }
     }
-    connectTimeout = Duration.ofMinutes(3)
-    clientTimeout = Duration.ofMinutes(3)
+    connectTimeout.set(Duration.ofMinutes(3))
+    clientTimeout.set(Duration.ofMinutes(3))
 }
 
 def getBooleanProperty(String name, boolean defaultValue) {
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 1b33c55..f8e1ee3 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index d4081da..23449a2 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index 23d15a9..adff685 100755
--- a/gradlew
+++ b/gradlew
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -114,7 +114,6 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -172,7 +171,6 @@ fi
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
     APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
     JAVACMD=$( cygpath --unix "$JAVACMD" )
 
@@ -212,7 +210,6 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
         -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
diff --git a/gradlew.bat b/gradlew.bat
index 5eed7ee..e509b2d 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -70,11 +70,10 @@ goto fail
 :execute
 @rem Setup the command line
 
-set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell