diff --git a/build.sbt b/build.sbt
index 8468ff7..2898f4a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -4,7 +4,7 @@ organization  := "org.renci"
 
 name          := "ncit-utils"
 
-version       := "0.5"
+version       := "0.5.1"
 
 licenses := Seq("BSD-3-Clause" -> url("https://opensource.org/licenses/BSD-3-Clause"))
 
@@ -27,7 +27,7 @@ libraryDependencies ++= {
     "org.phenoscape"              %% "scowl"                  % "1.3",
     "net.sourceforge.owlapi"      %  "owlapi-distribution"    % "4.3.1",
     "org.semanticweb.elk"         %  "elk-owlapi"             % "0.4.3",
-    "org.geneontology"            %% "whelk"                  % "0.1.3",
+    "org.geneontology"            %% "whelk"                  % "0.2.1",
     "io.monix"                    %% "monix"                  % "3.0.0-RC1",
     "org.apache.jena"             %  "apache-jena-libs"       % "3.8.0" exclude("org.slf4j", "slf4j-log4j12"),
     "org.backuity.clist"          %% "clist-core"             % "3.2.2",