diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 095dd5abc4..69f351ca5c 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -34,10 +34,6 @@ updates:
       # Fails test automation; needs further investigation.
       - dependency-name: "com.google.inject:guice-bom"
 
-      # Requires Java 11 starting with version 10.0.
-      - dependency-name: "com.puppycrawl.tools:checkstyle"
-        versions: [">=10.0"]
-
       # Contains incompatible API changes and needs compatibility work.
       - dependency-name: "jakarta.servlet.jsp.jstl:jakarta.servlet.jsp.jstl-api"
 
diff --git a/Jenkinsfile b/Jenkinsfile
index 05f5fbf239..d764a739cc 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -13,22 +13,19 @@ properties([
 ])
 
 def buildTypes = ['Linux', 'Windows']
-def jdks = [8, 11, 17]
+def jdks = [11, 17]
 
 def builds = [:]
 for (i = 0; i < buildTypes.size(); i++) {
   for (j = 0; j < jdks.size(); j++) {
     def buildType = buildTypes[i]
     def jdk = jdks[j]
-    if (buildType == 'Windows' && jdk == 8) {
-      continue // unnecessary use of hardware
-    }
     if (buildType == 'Windows' && jdk == 17) {
       continue // TODO pending jenkins-infra/helpdesk#2822
     }
     builds["${buildType}-jdk${jdk}"] = {
       // see https://github.com/jenkins-infra/documentation/blob/master/ci.adoc#node-labels for information on what node types are available
-      def agentContainerLabel = jdk == 8 ? 'maven' : 'maven-' + jdk
+      def agentContainerLabel = 'maven-' + jdk
       if (buildType == 'Windows') {
         agentContainerLabel += '-windows'
       }
diff --git a/core/pom.xml b/core/pom.xml
index 27554bf946..7ea13c2057 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -719,7 +719,8 @@ THE SOFTWARE.
         <artifactId>maven-surefire-plugin</artifactId>
         <!-- Version specified in grandparent POM -->
         <configuration>
-          <argLine>@{jacocoSurefireArgs}</argLine>
+          <!-- Make sure to keep the directives in test/pom.xml and war/pom.xml in sync with these. -->
+          <argLine>@{jacocoSurefireArgs} --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.desktop/com.sun.beans.introspect=ALL-UNNAMED</argLine>
           <forkCount>0.5C</forkCount>
           <reuseForks>false</reuseForks>
         </configuration>
@@ -821,23 +822,6 @@ THE SOFTWARE.
         <maven.test.redirectTestOutputToFile>true</maven.test.redirectTestOutputToFile>
       </properties>
     </profile>
-    <profile>
-      <id>jdk-9-and-above</id>
-      <activation>
-        <jdk>[9,)</jdk>
-      </activation>
-      <build>
-        <plugins>
-          <plugin>
-            <artifactId>maven-surefire-plugin</artifactId>
-            <configuration>
-              <!-- Make sure to keep the directives in test/pom.xml and war/pom.xml in sync with these. -->
-              <argLine>@{jacocoSurefireArgs} --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.desktop/com.sun.beans.introspect=ALL-UNNAMED</argLine>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
     <profile>
       <id>enable-jacoco</id>
       <build>
diff --git a/core/src/main/java/hudson/model/UpdateCenter.java b/core/src/main/java/hudson/model/UpdateCenter.java
index 1ac875c03c..3aad76f1f0 100644
--- a/core/src/main/java/hudson/model/UpdateCenter.java
+++ b/core/src/main/java/hudson/model/UpdateCenter.java
@@ -114,7 +114,6 @@ import jenkins.util.io.OnMaster;
 import net.sf.json.JSONObject;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.io.input.CountingInputStream;
-import org.apache.commons.io.output.NullOutputStream;
 import org.jenkinsci.Symbol;
 import org.jvnet.localizer.Localizable;
 import org.kohsuke.accmod.Restricted;
@@ -1422,8 +1421,8 @@ public class UpdateCenter extends AbstractModelObject implements Saveable, OnMas
                         throw new HttpRetryException("Invalid response code (" + responseCode + ") from URL: " + url, responseCode);
                     }
                 } else {
-                    try (InputStream is = connection.getInputStream()) {
-                        IOUtils.copy(is, NullOutputStream.NULL_OUTPUT_STREAM);
+                    try (InputStream is = connection.getInputStream(); OutputStream os = OutputStream.nullOutputStream()) {
+                        IOUtils.copy(is, os);
                     }
                 }
             } catch (SSLHandshakeException e) {
diff --git a/pom.xml b/pom.xml
index 9151a996c4..f0638bbcd3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -28,7 +28,7 @@ THE SOFTWARE.
   <parent>
     <groupId>org.jenkins-ci</groupId>
     <artifactId>jenkins</artifactId>
-    <version>1.76</version>
+    <version>1.77</version>
     <relativePath />
   </parent>
 
@@ -85,8 +85,6 @@ THE SOFTWARE.
     <project.patchManagement.url>https://api.github.com</project.patchManagement.url>
     <patch.tracker.serverId>jenkins-jira</patch.tracker.serverId>
 
-    <animal.sniffer.skip>${skipTests}</animal.sniffer.skip>
-
     <changelog.url>https://www.jenkins.io/changelog</changelog.url>
 
     <!-- Bundled Remoting version -->
@@ -380,10 +378,6 @@ THE SOFTWARE.
             </lifecycleMappingMetadata>
           </configuration>
         </plugin>
-        <plugin>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>animal-sniffer-maven-plugin</artifactId>
-        </plugin>
         <plugin>
           <groupId>com.github.spotbugs</groupId>
           <artifactId>spotbugs-maven-plugin</artifactId>
@@ -406,7 +400,7 @@ THE SOFTWARE.
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>9.3</version>
+              <version>10.3</version>
             </dependency>
           </dependencies>
           <executions>
@@ -471,7 +465,7 @@ THE SOFTWARE.
           <arguments>-P release,sign</arguments>
           <!-- work around for a bug in javadoc plugin that causes the release to fail. see MRELEASE-271 -->
           <preparationGoals>clean install</preparationGoals>
-          <goals>-DskipTests -Danimal.sniffer.skip=false -Dspotbugs.skip -Dmaven.checkstyle.skip -Dspotless.check.skip generate-resources javadoc:javadoc deploy</goals>
+          <goals>-DskipTests -Dspotbugs.skip -Dmaven.checkstyle.skip -Dspotless.check.skip generate-resources javadoc:javadoc deploy</goals>
           <pushChanges>false</pushChanges>
           <localCheckout>true</localCheckout>
           <tagNameFormat>jenkins-@{project.version}</tagNameFormat>
@@ -647,27 +641,5 @@ THE SOFTWARE.
         <failIfNoTests>false</failIfNoTests>
       </properties>
     </profile>
-    <profile>
-      <id>jdk-17-and-above</id>
-      <activation>
-        <jdk>[17,)</jdk>
-      </activation>
-      <properties>
-        <!--
-          Animal Sniffer does not work on Java 17, but we cannot remove it from our configuration
-          entirely until we drop support for Java 8. As a temporary solution, we skip it when
-          running on Java 17. When JENKINS-54842 is resolved, this can be deleted.
-        -->
-        <animal.sniffer.skip>true</animal.sniffer.skip>
-
-        <!--
-          Spotless requires custom arguments to be added to .mvn/jvm.config when running on Java 17,
-          but we cannot add those custom arguments until we drop support for Java 8. As a temporary
-          workaround, we skip Spotless when running on Java 17. When JENKINS-68015 is resolved, this
-          can be deleted.
-        -->
-        <spotless.check.skip>true</spotless.check.skip>
-      </properties>
-    </profile>
   </profiles>
 </project>
diff --git a/src/spotbugs/spotbugs-excludes.xml b/src/spotbugs/spotbugs-excludes.xml
index 1e6be9807d..96dd3781fb 100644
--- a/src/spotbugs/spotbugs-excludes.xml
+++ b/src/spotbugs/spotbugs-excludes.xml
@@ -563,7 +563,10 @@
       </And>
       <And>
         <Bug pattern="SSD_DO_NOT_USE_INSTANCE_LOCK_ON_SHARED_STATIC_DATA"/>
-        <Class name="hudson.model.ViewJob"/>
+        <Or>
+          <Class name="hudson.model.ViewJob"/>
+          <Class name="hudson.TcpSlaveAgentListener$ConnectionHandler"/>
+        </Or>
       </And>
       <And>
         <Bug pattern="STATIC_IV"/>
diff --git a/test/pom.xml b/test/pom.xml
index 84256a8e5f..8f0817ce98 100644
--- a/test/pom.xml
+++ b/test/pom.xml
@@ -42,6 +42,11 @@ THE SOFTWARE.
     <mavenDebug>false</mavenDebug>
     <!-- Filled in by jacoco-maven-plugin -->
     <jacocoSurefireArgs />
+    <!--
+      Filled in by maven-hpi-plugin from the MANIFEST.MF entry in jenkins.war, but we provide a default value for the benefit of IDEs.
+      Make sure to keep the directives in core/pom.xml and war/pom.xml in sync with these.
+    -->
+    <jenkins.addOpens>--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.desktop/com.sun.beans.introspect=ALL-UNNAMED</jenkins.addOpens>
     <!-- Filled in by maven-hpi-plugin with the path to org-netbeans-insane-hook.jar extracted from jenkins-test-harness -->
     <jenkins.insaneHook />
   </properties>
@@ -367,30 +372,5 @@ THE SOFTWARE.
         </plugins>
       </build>
     </profile>
-    <profile>
-      <id>jdk-8-and-below</id>
-      <activation>
-        <jdk>(,1.8]</jdk>
-      </activation>
-      <properties>
-        <!--
-          Filled in by maven-hpi-plugin from the MANIFEST.MF entry in jenkins.war, but we provide a default value for the benefit of IDEs.
-        -->
-        <jenkins.addOpens />
-      </properties>
-    </profile>
-    <profile>
-      <id>jdk-9-and-above</id>
-      <activation>
-        <jdk>[9,)</jdk>
-      </activation>
-      <properties>
-        <!--
-          Filled in by maven-hpi-plugin from the MANIFEST.MF entry in jenkins.war, but we provide a default value for the benefit of IDEs.
-          Make sure to keep the directives in core/pom.xml and war/pom.xml in sync with these.
-        -->
-        <jenkins.addOpens>--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.desktop/com.sun.beans.introspect=ALL-UNNAMED</jenkins.addOpens>
-      </properties>
-    </profile>
   </profiles>
 </project>