diff --git a/scripts/prep.sh b/scripts/prep.sh
index 25721a4c..7dbb39d4 100755
--- a/scripts/prep.sh
+++ b/scripts/prep.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-VERSION=https://github.com/dafny-lang/dafny/releases/download/v4.2.0/dafny-4.2.0-x64-ubuntu-20.04.zip
+VERSION=https://github.com/dafny-lang/dafny/releases/download/v4.3.0/dafny-4.3.0-x64-ubuntu-20.04.zip
 
 wget $VERSION
 unzip `basename $VERSION` 
\ No newline at end of file