diff --git a/pom.xml b/pom.xml
index 1e127e4098..2f6959358e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>edu.cmu</groupId>
     <artifactId>tetrad</artifactId>
-    <version>6.4.0-SNAPSHOT</version>
+    <version>6.3.1</version>
     <packaging>pom</packaging>
 
     <name>Tetrad Project</name>
diff --git a/tetrad-gui/pom.xml b/tetrad-gui/pom.xml
index 9b3f2a016b..4f45b835a1 100644
--- a/tetrad-gui/pom.xml
+++ b/tetrad-gui/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>edu.cmu</groupId>
         <artifactId>tetrad</artifactId>
-        <version>6.4.0-SNAPSHOT</version>
+        <version>6.3.1</version>
     </parent>
 
     <artifactId>tetrad-gui</artifactId>
diff --git a/tetrad-lib/pom.xml b/tetrad-lib/pom.xml
index d9cc54dd73..5edf5b4771 100644
--- a/tetrad-lib/pom.xml
+++ b/tetrad-lib/pom.xml
@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>edu.cmu</groupId>
 		<artifactId>tetrad</artifactId>
-		<version>6.4.0-SNAPSHOT</version>
+		<version>6.3.1</version>
 	</parent>
 
 	<artifactId>tetrad-lib</artifactId>