diff --git a/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/TychoRepositoryTransport.java b/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/TychoRepositoryTransport.java
index b88d3d0d00..89dc8e7eca 100644
--- a/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/TychoRepositoryTransport.java
+++ b/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/TychoRepositoryTransport.java
@@ -29,7 +29,6 @@
 import java.util.concurrent.atomic.LongAdder;
 
 import org.apache.commons.io.FileUtils;
-import org.apache.commons.io.IOUtils;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.Logger;
@@ -99,7 +98,7 @@ public IStatus download(URI toDownload, OutputStream target, IProgressMonitor mo
 		try {
 			DownloadStatusOutputStream statusOutputStream = new DownloadStatusOutputStream(target,
 					"Download of " + toDownload);
-			IOUtils.copy(stream(toDownload, monitor), statusOutputStream);
+			stream(toDownload, monitor).transferTo(statusOutputStream);
 			DownloadStatus downloadStatus = statusOutputStream.getStatus();
 			if (cacheConfig.isInteractive()) {
 			logger.info(
diff --git a/tycho-artifactcomparator/src/main/java/org/eclipse/tycho/artifactcomparator/ComparatorInputStream.java b/tycho-artifactcomparator/src/main/java/org/eclipse/tycho/artifactcomparator/ComparatorInputStream.java
index 3c11c3301e..fbe62dd660 100644
--- a/tycho-artifactcomparator/src/main/java/org/eclipse/tycho/artifactcomparator/ComparatorInputStream.java
+++ b/tycho-artifactcomparator/src/main/java/org/eclipse/tycho/artifactcomparator/ComparatorInputStream.java
@@ -18,8 +18,6 @@
 import java.nio.charset.Charset;
 import java.util.Arrays;
 
-import org.apache.commons.io.IOUtils;
-
 /**
  * Input stream to carry some important information for comparison and allows direct access to the
  * underlying buffer.
@@ -32,7 +30,7 @@ public class ComparatorInputStream extends ByteArrayInputStream {
     private final byte[] content;
 
     public ComparatorInputStream(InputStream stream) throws IOException {
-        this(IOUtils.toByteArray(stream));
+        this(stream.readAllBytes());
     }
 
     public ComparatorInputStream(byte[] content) {
diff --git a/tycho-its/src/test/java/org/eclipse/tycho/test/product/Tycho188P2EnabledRcpTest.java b/tycho-its/src/test/java/org/eclipse/tycho/test/product/Tycho188P2EnabledRcpTest.java
index 73f46e092a..63546b8895 100644
--- a/tycho-its/src/test/java/org/eclipse/tycho/test/product/Tycho188P2EnabledRcpTest.java
+++ b/tycho-its/src/test/java/org/eclipse/tycho/test/product/Tycho188P2EnabledRcpTest.java
@@ -28,7 +28,6 @@
 import java.util.Set;
 
 import org.apache.maven.it.Verifier;
-import org.codehaus.plexus.util.IOUtil;
 import org.eclipse.tycho.TargetEnvironment;
 import org.eclipse.tycho.test.AbstractTychoIntegrationTest;
 import org.eclipse.tycho.test.util.ArchiveContentUtil;
@@ -258,8 +257,7 @@ static private void assertTotalZipArtifacts(final Verifier verifier, final int e
 
 	public static Properties openPropertiesFromZip(File zipFile, String propertyFile) throws Exception {
 		Properties configIni = new Properties();
-		configIni.load(
-				new ByteArrayInputStream(IOUtil.toByteArray(ArchiveContentUtil.getFileContent(zipFile, propertyFile))));
+		configIni.load(new ByteArrayInputStream(ArchiveContentUtil.getFileContent(zipFile, propertyFile).getBytes()));
 		return configIni;
 	}
 
diff --git a/tycho-p2/tycho-p2-director-plugin/src/main/java/org/eclipse/tycho/plugins/tar/TarGzArchiver.java b/tycho-p2/tycho-p2-director-plugin/src/main/java/org/eclipse/tycho/plugins/tar/TarGzArchiver.java
index a92b9a8270..ab42871b17 100644
--- a/tycho-p2/tycho-p2-director-plugin/src/main/java/org/eclipse/tycho/plugins/tar/TarGzArchiver.java
+++ b/tycho-p2/tycho-p2-director-plugin/src/main/java/org/eclipse/tycho/plugins/tar/TarGzArchiver.java
@@ -30,7 +30,6 @@
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
 import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
-import org.apache.commons.compress.utils.IOUtils;
 import org.apache.maven.plugin.logging.Log;
 import org.apache.maven.plugin.logging.SystemStreamLog;
 
@@ -163,7 +162,7 @@ private PosixFileAttributes getAttributes(File source) {
 
     private static void copyFileContentToTarStream(File source, TarArchiveOutputStream tarStream) throws IOException {
         try (BufferedInputStream sourceStream = new BufferedInputStream(new FileInputStream(source))) {
-            IOUtils.copy(sourceStream, tarStream);
+            sourceStream.transferTo(tarStream);
         }
     }
 
diff --git a/tycho-p2/tycho-p2-director-plugin/src/test/java/org/eclipse/tycho/plugins/tar/TarGzArchiverTest.java b/tycho-p2/tycho-p2-director-plugin/src/test/java/org/eclipse/tycho/plugins/tar/TarGzArchiverTest.java
index 4b42070b94..94db68ef92 100644
--- a/tycho-p2/tycho-p2-director-plugin/src/test/java/org/eclipse/tycho/plugins/tar/TarGzArchiverTest.java
+++ b/tycho-p2/tycho-p2-director-plugin/src/test/java/org/eclipse/tycho/plugins/tar/TarGzArchiverTest.java
@@ -36,7 +36,6 @@
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
 import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
-import org.apache.commons.compress.utils.IOUtils;
 import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Rule;
@@ -226,7 +225,7 @@ private byte[] getTarEntry(String name) throws IOException {
             while ((tarEntry = tarStream.getNextTarEntry()) != null) {
                 if (name.equals(tarEntry.getName())) {
                     ByteArrayOutputStream baos = new ByteArrayOutputStream();
-                    IOUtils.copy(tarStream, baos);
+                    tarStream.transferTo(baos);
                     return baos.toByteArray();
                 }
             }