diff --git a/.gitignore b/.gitignore
index 50512b5..2802541 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,5 @@
 hs_err_pid*
 target/
 nohup.out
+
+.idea
diff --git a/Dockerfile b/Dockerfile
index 9465820..49598a0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,14 @@
 # syntax=docker/dockerfile:1
+FROM maven:eclipse-temurin AS builder
+
+WORKDIR /tmp
+
+COPY src /tmp/src
+COPY resources /tmp/resources
+COPY static /tmp/static
+COPY pom.xml /tmp/pom.xml
+
+RUN mvn -B -f /tmp/pom.xml clean package
 
 FROM ubuntu:latest
 
@@ -17,12 +27,10 @@ RUN apt install -y ghostscript pdf2svg texlive-extra-utils
 
 RUN apt install -y openjdk-11-jre
 
-COPY src /app/src
 COPY resources /app/resources
 COPY static /app/static
-COPY pom.xml /app/pom.xml
 
 # Assumes mvn install was run prior to build Dockerfile
-ADD target/antlr4-lab-$LAB_VERSION-complete.jar antlr4-lab-$LAB_VERSION-complete.jar
-ENTRYPOINT java -jar /app/antlr4-lab-$LAB_VERSION-complete.jar
+COPY --from=builder /tmp/target/antlr4-lab-*-complete.jar antlr4-lab-complete.jar
+ENTRYPOINT ["java", "-jar", "/app/antlr4-lab-complete.jar"]
 EXPOSE 80
diff --git a/README.md b/README.md
index 19c7ca0..df48e09 100644
--- a/README.md
+++ b/README.md
@@ -52,24 +52,16 @@ If you are running the server locally on your box, visit [http://localhost/index
 
 ### Docker
 
-I created a [Dockerfile](Dockerfile), although I'm not sure how useful it will be to people. This might be useful for deploying in the cloud later.
-
-Here's how to build the docker file:
-
+Docker builds both jar and the image:
 ```bash
-cd antlr4-lab
-mvn clean package  # has to be built first as docker copies in the jar
-docker build --tag antlr4-lab-docker .
+docker build -t antlr4-lab .
 ```
 
-and here's how to use the docker to launch:
-
+To run docker image:
 ```bash
-docker run -p80:80 --rm antlr4-lab-docker
+docker run -p 8080:80 antlr4-lab
 ```
 
-@kaby76 reports the following: Seems to work fine. But I had to do some things to get it to work on Windows/WSL2.
-
 In Windows: Install Docker Desktop
 
 In WSL2/Ubuntu:
diff --git a/pom.xml b/pom.xml
index 9f12d00..8a92e48 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,10 +1,5 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 	<modelVersion>4.0.0</modelVersion>
-	<parent>
-		<groupId>org.sonatype.oss</groupId>
-		<artifactId>oss-parent</artifactId>
-		<version>9</version>
-	</parent>
 
 	<groupId>org.antlr</groupId>
 	<artifactId>antlr4-lab</artifactId>
@@ -47,55 +42,35 @@
             <artifactId>antlr4</artifactId>
             <version>4.13.1</version>
         </dependency>
-        <dependency>
-            <groupId>org.antlr</groupId>
-            <artifactId>antlr-runtime</artifactId>
-            <version>3.5.3</version>
-        </dependency>
-        <dependency>
-            <groupId>org.antlr</groupId>
-            <artifactId>ST4</artifactId>
-            <version>4.3.4</version>
-        </dependency>
-        <dependency>
-            <groupId>org.eclipse.jetty</groupId>
-            <artifactId>jetty-server</artifactId>
-            <version>11.0.11</version>
-        </dependency>
         <dependency>
             <groupId>org.eclipse.jetty</groupId>
             <artifactId>jetty-webapp</artifactId>
-            <version>11.0.11</version>
+            <version>11.0.18</version>
         </dependency>
 		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-api</artifactId>
-			<version>1.7.36</version>
-		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-jdk14</artifactId>
-			<version>1.8.0-beta4</version>
+			<groupId>jakarta.servlet</groupId>
+			<artifactId>jakarta.servlet-api</artifactId>
+			<version>6.0.0</version>
 		</dependency>
 		<dependency>
 			<groupId>ch.qos.logback</groupId>
-			<artifactId>logback-core</artifactId>
-			<version>1.2.11</version>
+			<artifactId>logback-classic</artifactId>
+			<version>1.4.11</version>
 		</dependency>
 		<dependency>
-			<groupId>ch.qos.logback</groupId>
-			<artifactId>logback-classic</artifactId>
-			<version>1.2.6</version>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-api</artifactId>
+			<version>2.0.9</version>
 		</dependency>
 		<dependency>
 			<groupId>us.parr</groupId>
 			<artifactId>parrtlib</artifactId>
-			<version>0.5-SNAPSHOT</version>
+			<version>0.4</version>
 		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
-			<version>2.10</version>
+			<version>2.10.1</version>
 		</dependency>
 	</dependencies>
 	<build>
diff --git a/resources/logback.xml b/resources/logback.xml
index 1e76bef..f5f8373 100644
--- a/resources/logback.xml
+++ b/resources/logback.xml
@@ -16,9 +16,10 @@
     </appender>
     <logger name="org.antlr.v4.server.ANTLRHttpServer" level="INFO">
         <appender-ref ref="FILE"/>
+        <appender-ref ref="STDOUT"/>
     </logger>
 
     <root level="ERROR">
         <appender-ref ref="STDOUT" />
     </root>
-</configuration>
\ No newline at end of file
+</configuration>
diff --git a/src/org/antlr/v4/server/GrammarProcessor.java b/src/org/antlr/v4/server/GrammarProcessor.java
index 1261357..6e13d57 100644
--- a/src/org/antlr/v4/server/GrammarProcessor.java
+++ b/src/org/antlr/v4/server/GrammarProcessor.java
@@ -13,11 +13,11 @@
 import org.antlr.v4.runtime.tree.ParseTree;
 import org.antlr.v4.runtime.tree.Tree;
 import org.antlr.v4.tool.*;
+import us.parr.lib.ParrtSys;
 
 import static org.antlr.v4.gui.Interpreter.profilerColumnNames;
 import static org.antlr.v4.server.ANTLRHttpServer.IMAGES_DIR;
 import static org.antlr.v4.server.ANTLRHttpServer.ParseServlet.LOGGER;
-import static us.parr.lib.ParrtSys.execInDir;
 
 import java.io.*;
 import java.nio.file.Files;
@@ -259,6 +259,10 @@ public static String toSVG(Tree t, List<String> ruleNames) throws IOException {
         return svg;
     }
 
+    private static String[] execInDir(String imagesDir, String program, String... args) {
+        return ParrtSys.exec("env --chdir=" + imagesDir + " " + program + " " + String.join(" ", args));
+    }
+
     public static final int nodeCount(Tree t) {
         if (t == null) {
             return 0;