Update checkstyle and other plugins/deps
diff --git a/pom.xml b/pom.xml
index 6c08e89..0741f73 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>21</version>
+    <version>23</version>
   </parent>
   <groupId>org.apache.accumulo</groupId>
   <artifactId>accumulo-examples</artifactId>
@@ -30,17 +30,18 @@
   <properties>
     <accumulo.version>2.0.0</accumulo.version>
     <eclipseFormatterStyle>contrib/Eclipse-Accumulo-Codestyle.xml</eclipseFormatterStyle>
-    <hadoop.version>3.2.0</hadoop.version>
+    <hadoop.version>3.2.1</hadoop.version>
+    <maven.compiler.release>8</maven.compiler.release>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
-    <slf4j.version>1.7.21</slf4j.version>
+    <slf4j.version>1.7.30</slf4j.version>
   </properties>
   <dependencyManagement>
     <dependencies>
       <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
-        <version>26.0-jre</version>
+        <version>28.2-jre</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
@@ -62,7 +63,7 @@
     <dependency>
       <groupId>jline</groupId>
       <artifactId>jline</artifactId>
-      <version>2.11</version>
+      <version>2.14.6</version>
     </dependency>
     <dependency>
       <groupId>org.apache.accumulo</groupId>
@@ -98,12 +99,13 @@
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
       <version>${slf4j.version}</version>
+      <scope>runtime</scope>
     </dependency>
     <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
+      <version>4.13</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -171,7 +173,7 @@
                   <version>[3.5.0,)</version>
                 </requireMavenVersion>
                 <requireJavaVersion>
-                  <version>[${maven.compiler.target},)</version>
+                  <version>[11,)</version>
                 </requireJavaVersion>
               </rules>
             </configuration>
@@ -203,7 +205,7 @@
           <dependency>
             <groupId>com.puppycrawl.tools</groupId>
             <artifactId>checkstyle</artifactId>
-            <version>8.23</version>
+            <version>8.29</version>
           </dependency>
         </dependencies>
         <executions>