diff --git a/CHANGELOG b/CHANGELOG
index cac3184..a226bd5 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,10 @@
 # Releases
 
 
+## v0.4.2
+
+* make mac factory public
+
 ## v0.4.1
 
 * some small bugfixes
diff --git a/pom.xml b/pom.xml
index 4abcccf..ac6f852 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>at.favre.lib</groupId>
     <artifactId>hkdf</artifactId>
-    <version>0.4.1</version>
+    <version>0.4.2</version>
     <packaging>jar</packaging>
 
     <name>HKDF-RFC5869</name>
diff --git a/src/main/java/at/favre/lib/crypto/HkdfMacFactory.java b/src/main/java/at/favre/lib/crypto/HkdfMacFactory.java
index 382b53f..882a47e 100644
--- a/src/main/java/at/favre/lib/crypto/HkdfMacFactory.java
+++ b/src/main/java/at/favre/lib/crypto/HkdfMacFactory.java
@@ -10,7 +10,7 @@
 /**
  * Factory class for creating {@link Mac} hashers
  */
-interface HkdfMacFactory {
+public interface HkdfMacFactory {
 
     /**
      * Creates a new instance of Hmac with given key, i.e. it must already be initialized