diff --git a/bucket/dafny.json b/bucket/dafny.json
index 0a2e1cbc62..ef5147bb86 100644
--- a/bucket/dafny.json
+++ b/bucket/dafny.json
@@ -1,12 +1,12 @@
 {
-    "version": "3.8.1",
+    "version": "3.9.0",
     "description": "A programming language with a program verifier",
     "homepage": "https://dafny-lang.github.io/dafny/",
     "license": "MIT",
     "architecture": {
         "64bit": {
-            "url": "https://github.com/dafny-lang/dafny/releases/download/v3.8.1/dafny-3.8.1-x64-win.zip",
-            "hash": "16590b6625ce81266df519849e8d5c7675a794d4f7a608502b053d8bca5bee95",
+            "url": "https://github.com/dafny-lang/dafny/releases/download/v3.9.0/dafny-3.9.0-x64-win.zip",
+            "hash": "87921cefb2b7914b5f91549c98faf1676ad14b1b9a2f4e4b363b2e8aec0e3181",
             "extract_dir": "dafny"
         }
     },