diff --git a/prism/README.txt b/prism/README.txt
index 48adde2e..3499412b 100644
--- a/prism/README.txt
+++ b/prism/README.txt
@@ -2,7 +2,7 @@
 README
 ======
 
-This is PRISM (Probabilistic Symbolic Model Checker), version 4.0.
+This is PRISM (Probabilistic Symbolic Model Checker), version 4.0.1.
 
 ------------
 INSTALLATION
diff --git a/prism/src/prism/Prism.java b/prism/src/prism/Prism.java
index 8be951d1..99a44951 100644
--- a/prism/src/prism/Prism.java
+++ b/prism/src/prism/Prism.java
@@ -51,9 +51,9 @@ import prism.Model;
 public class Prism implements PrismSettingsListener
 {
 	// prism version
-	private static String version = "4.0";
+	private static String version = "4.0.1";
 	// prism version suffix
-	private static String versionSuffix = ".dev"; //".rXXXX";;
+	private static String versionSuffix = ""; // ".dev"; //".rXXXX";;
 	
 	//------------------------------------------------------------------------------
 	// Constants