diff --git a/prism/README.txt b/prism/README.txt
index a78ec4d1..58dd95b9 100644
--- a/prism/README.txt
+++ b/prism/README.txt
@@ -2,7 +2,7 @@
 README
 ======
 
-This is PRISM (Probabilistic Symbolic Model Checker), version 3.0.
+This is PRISM (Probabilistic Symbolic Model Checker), version 3.1.beta1.
 
 ------------
 INSTALLATION
diff --git a/prism/src/prism/Prism.java b/prism/src/prism/Prism.java
index 431ade4a..fa2c0064 100644
--- a/prism/src/prism/Prism.java
+++ b/prism/src/prism/Prism.java
@@ -42,7 +42,7 @@ import simulator.*;
 public class Prism implements PrismSettingsListener
 {
 	// prism version
-	private static final String version = "3.0";
+	private static final String version = "3.1.beta1";
 	
 	//------------------------------------------------------------------------------
 	// Constants