OutOfMemory when uploading artifact

When trying to upload a file larger than 50 MB with the integrated Upload UI, I'm getting this error message (using Nexus version 3.9.0-01):

2018-03-20 12:56:50,563+0100 ERROR [qtp1692653511-2006] *SYSTEM org.sonatype.nexus.internal.web.ErrorPageServlet - Unexpected exception
java.lang.OutOfMemoryError: Java heap space
        at org.apache.commons.io.output.ByteArrayOutputStream.needNewBuffer(ByteArrayOutputStream.java:122)
        at org.apache.commons.io.output.ByteArrayOutputStream.write(ByteArrayOutputStream.java:153)
        at org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:129)
        at org.apache.commons.fileupload.util.Streams.copy(Streams.java:107)
        at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
        at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
        at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
        at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.getFileItems(DirectJNgineServlet.java:657)
        at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.processUploadFormPost(DirectJNgineServlet.java:645)
        at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.processRequest(DirectJNgineServlet.java:613)
        at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.doPost(DirectJNgineServlet.java:580)
        at org.sonatype.nexus.extdirect.internal.ExtDirectServlet.doPost(ExtDirectServlet.java:138)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)
        at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)
        at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)
        at com.google.inject.servlet.DynamicServletPipeline.service(DynamicServletPipeline.java:71)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:112)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
        at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
        at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
        at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
        at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
        at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
        at org.sonatype.nexus.security.SecurityFilter.executeChain(SecurityFilter.java:85)