diff --git a/.github/workflows/publish-maven.yml b/.github/workflows/publish-maven.yml
index 5730218b30..a230e130d6 100644
--- a/.github/workflows/publish-maven.yml
+++ b/.github/workflows/publish-maven.yml
@@ -27,4 +27,4 @@ jobs:
         ORG_GRADLE_PROJECT_SIGNINGKEY: ${{ secrets.ORG_GRADLE_PROJECT_SIGNINGKEY }}
         ORG_GRADLE_PROJECT_SIGNINGPASSWORD: ${{ secrets.ORG_GRADLE_PROJECT_SIGNINGPASSWORD }}
       run: >-
-        ./gradlew publish
+        ./gradlew publish -Dorg.gradle.parallel=false
diff --git a/buildSrc/src/main/groovy/rhino.library-conventions.gradle b/buildSrc/src/main/groovy/rhino.library-conventions.gradle
index 5973ce60dd..c8369f213b 100644
--- a/buildSrc/src/main/groovy/rhino.library-conventions.gradle
+++ b/buildSrc/src/main/groovy/rhino.library-conventions.gradle
@@ -6,6 +6,7 @@
 plugins {
     id 'rhino.java-conventions'
     id 'maven-publish'
+    id 'signing'
     id 'jacoco'
     id 'net.ltgt.errorprone'
 }
@@ -98,6 +99,18 @@ task sourceJar(type: Jar) {
     }
 }
 
+signing {
+    if (project.hasProperty('SIGNINGKEY')) {
+        // Check for ORG_GRADLE_PROJECT_SIGNINGKEY environment variable for use in CI system.
+        // Otherwise, do not sign.
+        def signingKey = getProperty('SIGNINGKEY')
+        def signingPassword = getProperty('SIGNINGPASSWORD')
+        useInMemoryPgpKeys(signingKey, signingPassword)
+        sign publishing.publications
+    }
+}
+
+
 publishing {
     if (project.hasProperty("mavenPassword")) {
         repositories {
diff --git a/rhino-all/build.gradle b/rhino-all/build.gradle
index 2a6bd4b9cb..9821deaf4a 100644
--- a/rhino-all/build.gradle
+++ b/rhino-all/build.gradle
@@ -39,25 +39,30 @@ publishing {
     publications {
         rhinoall(MavenPublication) {
             from components.java
-            artifacts = [jar]
-            pom {
-                description = "Rhino JavaScript all-in-one JAR, not for use with modular Java projects"
-                url = "https://mozilla.github.io/rhino/"
-                licenses {
-                    license {
-                        name = "Mozilla Public License, Version 2.0"
-                        url = "http://www.mozilla.org/MPL/2.0/index.txt"
-                    }
-                }
-                scm {
-                    connection = "scm:git:git@github.com:mozilla/rhino.git"
-                    developerConnection = "scm:git:git@github.com:mozilla/rhino.git"
-                    url = "git@github.com:mozilla/rhino.git"
-                }
-                organization {
-                    name = "The Mozilla Foundation"
-                    url = "http://www.mozilla.org"
-                }
+            artifacts = [jar, sourceJar, javadocJar]
+            pom.withXml {
+                def root = asNode()
+
+                root.appendNode('description', "Rhino JavaScript all-in-one JAR, not for use with modular Java projects")
+                root.appendNode("url", "https://mozilla.github.io/rhino/")
+
+                def p = root.appendNode("parent")
+                p.appendNode("groupId", "org.sonatype.oss")
+                p.appendNode("artifactId", "oss-parent")
+                p.appendNode("version", "7")
+
+                def l = root.appendNode("licenses").appendNode("license")
+                l.appendNode("name", "Mozilla Public License, Version 2.0")
+                l.appendNode("url", "http://www.mozilla.org/MPL/2.0/index.txt")
+
+                def scm = root.appendNode("scm")
+                scm.appendNode("connection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("developerConnection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("url", "git@github.com:mozilla/rhino.git")
+
+                def o = root.appendNode("organization")
+                o.appendNode("name", "The Mozilla Foundation")
+                o.appendNode("url", "http://www.mozilla.org")
             }
         }
     }
diff --git a/rhino-engine/build.gradle b/rhino-engine/build.gradle
index 52bc35c2ff..0fffc30cc0 100644
--- a/rhino-engine/build.gradle
+++ b/rhino-engine/build.gradle
@@ -11,24 +11,29 @@ publishing {
         rhinoengine(MavenPublication) {
             from components.java
             artifacts = [jar, sourceJar, javadocJar]
-            pom {
-                description = "Rhino ScriptEngine implementation"
-                url = "https://mozilla.github.io/rhino/"
-                licenses {
-                    license {
-                        name = "Mozilla Public License, Version 2.0"
-                        url = "http://www.mozilla.org/MPL/2.0/index.txt"
-                    }
-                }
-                scm {
-                    connection = "scm:git:git@github.com:mozilla/rhino.git"
-                    developerConnection = "scm:git:git@github.com:mozilla/rhino.git"
-                    url = "git@github.com:mozilla/rhino.git"
-                }
-                organization {
-                    name = "The Mozilla Foundation"
-                    url = "http://www.mozilla.org"
-                }
+            pom.withXml {
+                def root = asNode()
+
+                root.appendNode('description', "Rhino ScriptEngine implementation")
+                root.appendNode("url", "https://mozilla.github.io/rhino/")
+
+                def p = root.appendNode("parent")
+                p.appendNode("groupId", "org.sonatype.oss")
+                p.appendNode("artifactId", "oss-parent")
+                p.appendNode("version", "7")
+
+                def l = root.appendNode("licenses").appendNode("license")
+                l.appendNode("name", "Mozilla Public License, Version 2.0")
+                l.appendNode("url", "http://www.mozilla.org/MPL/2.0/index.txt")
+
+                def scm = root.appendNode("scm")
+                scm.appendNode("connection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("developerConnection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("url", "git@github.com:mozilla/rhino.git")
+
+                def o = root.appendNode("organization")
+                o.appendNode("name", "The Mozilla Foundation")
+                o.appendNode("url", "http://www.mozilla.org")
             }
         }
     }
diff --git a/rhino-tools/build.gradle b/rhino-tools/build.gradle
index b94e0a7725..e70553298f 100644
--- a/rhino-tools/build.gradle
+++ b/rhino-tools/build.gradle
@@ -11,24 +11,29 @@ publishing {
         rhinotools(MavenPublication) {
             from components.java
             artifacts = [jar, sourceJar, javadocJar]
-            pom {
-                description = "Rhino tools, including shell and debugger"
-                url = "https://mozilla.github.io/rhino/"
-                licenses {
-                    license {
-                        name = "Mozilla Public License, Version 2.0"
-                        url = "http://www.mozilla.org/MPL/2.0/index.txt"
-                    }
-                }
-                scm {
-                    connection = "scm:git:git@github.com:mozilla/rhino.git"
-                    developerConnection = "scm:git:git@github.com:mozilla/rhino.git"
-                    url = "git@github.com:mozilla/rhino.git"
-                }
-                organization {
-                    name = "The Mozilla Foundation"
-                    url = "http://www.mozilla.org"
-                }
+            pom.withXml {
+                def root = asNode()
+
+                root.appendNode('description', "Rhino tools, including shell and debugger")
+                root.appendNode("url", "https://mozilla.github.io/rhino/")
+
+                def p = root.appendNode("parent")
+                p.appendNode("groupId", "org.sonatype.oss")
+                p.appendNode("artifactId", "oss-parent")
+                p.appendNode("version", "7")
+
+                def l = root.appendNode("licenses").appendNode("license")
+                l.appendNode("name", "Mozilla Public License, Version 2.0")
+                l.appendNode("url", "http://www.mozilla.org/MPL/2.0/index.txt")
+
+                def scm = root.appendNode("scm")
+                scm.appendNode("connection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("developerConnection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("url", "git@github.com:mozilla/rhino.git")
+
+                def o = root.appendNode("organization")
+                o.appendNode("name", "The Mozilla Foundation")
+                o.appendNode("url", "http://www.mozilla.org")
             }
         }
     }
diff --git a/rhino-xml/build.gradle b/rhino-xml/build.gradle
index d3aafc92b1..c1fa9baa57 100644
--- a/rhino-xml/build.gradle
+++ b/rhino-xml/build.gradle
@@ -11,24 +11,29 @@ publishing {
         rhinoxml(MavenPublication) {
             from components.java
             artifacts = [jar, sourceJar, javadocJar]
-            pom {
-                description = "Rhino XML support"
-                url = "https://mozilla.github.io/rhino/"
-                licenses {
-                    license {
-                        name = "Mozilla Public License, Version 2.0"
-                        url = "http://www.mozilla.org/MPL/2.0/index.txt"
-                    }
-                }
-                scm {
-                    connection = "scm:git:git@github.com:mozilla/rhino.git"
-                    developerConnection = "scm:git:git@github.com:mozilla/rhino.git"
-                    url = "git@github.com:mozilla/rhino.git"
-                }
-                organization {
-                    name = "The Mozilla Foundation"
-                    url = "http://www.mozilla.org"
-                }
+            pom.withXml {
+                def root = asNode()
+
+                root.appendNode('description', "Rhino XML support")
+                root.appendNode("url", "https://mozilla.github.io/rhino/")
+
+                def p = root.appendNode("parent")
+                p.appendNode("groupId", "org.sonatype.oss")
+                p.appendNode("artifactId", "oss-parent")
+                p.appendNode("version", "7")
+
+                def l = root.appendNode("licenses").appendNode("license")
+                l.appendNode("name", "Mozilla Public License, Version 2.0")
+                l.appendNode("url", "http://www.mozilla.org/MPL/2.0/index.txt")
+
+                def scm = root.appendNode("scm")
+                scm.appendNode("connection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("developerConnection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("url", "git@github.com:mozilla/rhino.git")
+
+                def o = root.appendNode("organization")
+                o.appendNode("name", "The Mozilla Foundation")
+                o.appendNode("url", "http://www.mozilla.org")
             }
         }
     }
diff --git a/rhino/build.gradle b/rhino/build.gradle
index 160df15559..1bf180c747 100644
--- a/rhino/build.gradle
+++ b/rhino/build.gradle
@@ -11,24 +11,33 @@ publishing {
         rhino(MavenPublication) {
             from components.java
             artifacts = [jar, sourceJar, javadocJar]
-            pom {
-                description = "Rhino JavaScript runtime jar, excludes XML, tools ScriptEngine wrapper"
-                url = "https://mozilla.github.io/rhino/"
-                licenses {
-                    license {
-                        name = "Mozilla Public License, Version 2.0"
-                        url = "http://www.mozilla.org/MPL/2.0/index.txt"
-                    }
-                }
-                scm {
-                    connection = "scm:git:git@github.com:mozilla/rhino.git"
-                    developerConnection = "scm:git:git@github.com:mozilla/rhino.git"
-                    url = "git@github.com:mozilla/rhino.git"
-                }
-                organization {
-                    name = "The Mozilla Foundation"
-                    url = "http://www.mozilla.org"
-                }
+            // We need to use the "withXml" method here, rather than the
+            // "pom" element in Gradle, because we can't add the "parent"
+            // attribute otherwise, and without it Maven Central verification
+            // will fail.
+            pom.withXml {
+                def root = asNode()
+
+                root.appendNode('description', "Rhino JavaScript runtime jar, excludes XML, tools, and ScriptEngine wrapper")
+                root.appendNode("url", "https://mozilla.github.io/rhino/")
+
+                def p = root.appendNode("parent")
+                p.appendNode("groupId", "org.sonatype.oss")
+                p.appendNode("artifactId", "oss-parent")
+                p.appendNode("version", "7")
+
+                def l = root.appendNode("licenses").appendNode("license")
+                l.appendNode("name", "Mozilla Public License, Version 2.0")
+                l.appendNode("url", "http://www.mozilla.org/MPL/2.0/index.txt")
+
+                def scm = root.appendNode("scm")
+                scm.appendNode("connection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("developerConnection", "scm:git:git@github.com:mozilla/rhino.git")
+                scm.appendNode("url", "git@github.com:mozilla/rhino.git")
+
+                def o = root.appendNode("organization")
+                o.appendNode("name", "The Mozilla Foundation")
+                o.appendNode("url", "http://www.mozilla.org")
             }
         }
     }