diff --git a/.classpath b/.classpath
index 0f2ae397..7fda4b1b 100644
--- a/.classpath
+++ b/.classpath
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="lib" path="lib/dom4j-2.1.3.jar"/>
-	<classpathentry kind="lib" path="lib/log4j-api-2.17.1.jar"/>
-	<classpathentry kind="lib" path="lib/log4j-core-2.17.1.jar"/>
+	<classpathentry kind="lib" path="lib/dom4j-2.1.4.jar"/>
+	<classpathentry kind="lib" path="lib/log4j-api-2.20.0.jar"/>
+	<classpathentry kind="lib" path="lib/log4j-core-2.20.0.jar"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
 		<attributes>
 			<attribute name="owner.project.facets" value="java"/>
diff --git a/build.xml b/build.xml
index 814435d1..f436b0d0 100644
--- a/build.xml
+++ b/build.xml
@@ -96,7 +96,7 @@
         		<include name="log4j2.xml"/>
         	</fileset>
         	<manifest>
-        		<attribute name="Class-Path" value="log4j-api-2.17.1.jar log4j-core-2.17.1.jar dom4j-2.1.3.jar" />
+        		<attribute name="Class-Path" value="log4j-api-2.20.0.jar log4j-core-2.20.0.jar dom4j-2.1.4.jar" />
         		<attribute name="Ifs-Version" value="1.4_bld${build.number}"/>
         	</manifest>
         </jar>
@@ -112,7 +112,7 @@
         		<include name="log4j2.xml"/>
         	</fileset>
         	<manifest>
-        		<attribute name="Class-Path" value="log4j-api-2.17.1.jar log4j-core-2.17.1.jar dom4j-2.1.3.jar ifs-1.4.jar" />
+        		<attribute name="Class-Path" value="log4j-api-2.20.0.jar log4j-core-2.20.0.jar dom4j-2.1.4.jar ifs-1.4.jar" />
         		<attribute name="CourseTT-Version" value="1.4_bld${build.number}"/>
         		<attribute name="Main-Class" value="org.cpsolver.coursett.Test"/>
         	</manifest>
@@ -129,7 +129,7 @@
         		<include name="log4j2.xml"/>
         	</fileset>
         	<manifest>
-        		<attribute name="Class-Path" value="log4j-api-2.17.1.jar log4j-core-2.17.1.jar dom4j-2.1.3.jar ifs-1.4.jar coursett-1.4.jar" />
+        		<attribute name="Class-Path" value="log4j-api-2.20.0.jar log4j-core-2.20.0.jar dom4j-2.1.4.jar ifs-1.4.jar coursett-1.4.jar" />
         		<attribute name="StudentSct-Version" value="1.4_bld${build.number}"/>
         		<attribute name="Main-Class" value="org.cpsolver.studentsct.Test"/>
         	</manifest>
@@ -146,7 +146,7 @@
         		<include name="log4j2.xml"/>
         	</fileset>
         	<manifest>
-        		<attribute name="Class-Path" value="log4j-api-2.17.1.jar log4j-core-2.17.1.jar dom4j-2.1.3.jar ifs-1.4.jar" />
+        		<attribute name="Class-Path" value="log4j-api-2.20.0.jar log4j-core-2.20.0.jar dom4j-2.1.4.jar ifs-1.4.jar" />
         		<attribute name="ExamTT-Version" value="1.4_bld${build.number}"/>
         		<attribute name="Main-Class" value="org.cpsolver.exam.Test"/>
         	</manifest>
@@ -163,7 +163,7 @@
         		<include name="log4j2.xml"/>
         	</fileset>
         	<manifest>
-        		<attribute name="Class-Path" value="log4j-api-2.17.1.jar log4j-core-2.17.1.jar dom4j-2.1.3.jar" /> 
+        		<attribute name="Class-Path" value="log4j-api-2.20.0.jar log4j-core-2.20.0.jar dom4j-2.1.4.jar" /> 
         		<attribute name="Ifs-Version" value="1.4_bld${build.number}"/>
         		<attribute name="CourseTT-Version" value="1.4_bld${build.number}"/>
         		<attribute name="StudentSct-Version" value="1.4_bld${build.number}"/>
@@ -223,7 +223,7 @@
     	<link href="https://docs.oracle.com/javase/8/docs/api/"/>
  	   	<link href="https://logging.apache.org/log4j/2.x/log4j-api/apidocs/"/>
     	<link href="https://logging.apache.org/log4j/2.x/log4j-core/apidocs/"/>
-    	<link href="https://dom4j.github.io/javadoc/2.1.3/"/>
+    	<link href="https://dom4j.github.io/javadoc/2.1.4/"/>
  	   	<fileset dir="src" includes="**/*.java"/>
     	<packageset dir="src" includes="**/package.html"/>
  	   	<classpath>
diff --git a/lib/dom4j-2.1.3.jar b/lib/dom4j-2.1.3.jar
deleted file mode 100644
index 9a4f5d27..00000000
Binary files a/lib/dom4j-2.1.3.jar and /dev/null differ
diff --git a/lib/dom4j-2.1.4.jar b/lib/dom4j-2.1.4.jar
new file mode 100644
index 00000000..0769bed9
Binary files /dev/null and b/lib/dom4j-2.1.4.jar differ
diff --git a/lib/log4j-api-2.17.1.jar b/lib/log4j-api-2.17.1.jar
deleted file mode 100644
index 605c45d0..00000000
Binary files a/lib/log4j-api-2.17.1.jar and /dev/null differ
diff --git a/lib/log4j-api-2.20.0.jar b/lib/log4j-api-2.20.0.jar
new file mode 100644
index 00000000..29d1b52a
Binary files /dev/null and b/lib/log4j-api-2.20.0.jar differ
diff --git a/lib/log4j-core-2.17.1.jar b/lib/log4j-core-2.17.1.jar
deleted file mode 100644
index bbead126..00000000
Binary files a/lib/log4j-core-2.17.1.jar and /dev/null differ
diff --git a/lib/log4j-core-2.20.0.jar b/lib/log4j-core-2.20.0.jar
new file mode 100644
index 00000000..54dafcd0
Binary files /dev/null and b/lib/log4j-core-2.20.0.jar differ
diff --git a/pom.xml b/pom.xml
index 90952b10..ec276cf5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,12 +64,12 @@
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-core</artifactId>
-			<version>2.17.1</version>
+			<version>2.20.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.dom4j</groupId>
 			<artifactId>dom4j</artifactId>
-			<version>2.1.3</version>
+			<version>2.1.4</version>
 		</dependency>
 	</dependencies>