diff --git a/.github/workflows/continuous-integration.yaml b/.github/workflows/continuous-integration.yaml
index fe2408431..78edd4088 100644
--- a/.github/workflows/continuous-integration.yaml
+++ b/.github/workflows/continuous-integration.yaml
@@ -21,7 +21,6 @@ jobs:
       max-parallel: 4
       matrix:
         java:
-          - '8'
           - '11'
           - '17'
         os:
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 6e68f408c..c9f268939 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -50,6 +50,7 @@ Improvement::
 Bug Fixes::
 
 * CLI should set :mkdirs option by default (#1241) (@mojavelinux)
+* Fix unresolvable dependency of JRuby Gradle plugin. (#1275)
 
 == 2.5.10 (2023-06-04)
 
diff --git a/asciidoctorj-springboot-integration-test/src/test/java/org/asciidoctor/it/springboot/SpringBootTest.java b/asciidoctorj-springboot-integration-test/src/test/java/org/asciidoctor/it/springboot/SpringBootTest.java
index 87e2244b2..ad7886867 100644
--- a/asciidoctorj-springboot-integration-test/src/test/java/org/asciidoctor/it/springboot/SpringBootTest.java
+++ b/asciidoctorj-springboot-integration-test/src/test/java/org/asciidoctor/it/springboot/SpringBootTest.java
@@ -2,7 +2,6 @@
 
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
-import kotlin.collections.ArrayDeque;
 import okhttp3.*;
 import org.awaitility.Awaitility;
 import org.junit.After;
@@ -10,20 +9,20 @@
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.TimeUnit;
 
-import static java.util.Collections.emptyMap;
 import static java.util.Collections.singletonMap;
 import static org.asciidoctor.it.springboot.ProcessHelper.run;
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class SpringBootTest {
 
-    final List<Process> testProcesses = new ArrayDeque<>();
+    final List<Process> testProcesses = new ArrayList<>();
 
 
     @Test
diff --git a/build.gradle b/build.gradle
index 3e1efe2c1..abbeaa729 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,6 +16,11 @@ buildscript {
     }
     dependencies {
         classpath "biz.aQute.bnd:biz.aQute.bnd.gradle:5.3.0"
+        classpath("com.github.jruby-gradle:jruby-gradle-plugin:2.0.1") {
+          exclude module: 'grolifant'
+          exclude module: 'okhttp-digest'
+        }
+        classpath 'org.ysb33r.gradle:grolifant:0.17.0'
     }
 }
 
@@ -24,7 +29,8 @@ plugins {
   id "io.sdkman.vendors" version "2.0.0"
   id "signing"
   id "io.github.gradle-nexus.publish-plugin" version "1.1.0"
-  id 'com.github.jruby-gradle.base' version '2.0.0'
+  // Moved to dependency in buildscript. See https://github.com/asciidoctor/asciidoctorj/issues/1275
+  // id 'com.github.jruby-gradle.base' version '2.0.1'
   id 'codenarc'
 }