diff --git a/stack.json b/stack.json
index b6becdaf71..b50a31e5dd 100644
--- a/stack.json
+++ b/stack.json
@@ -1,15 +1,15 @@
 {
     "homepage": "https://www.haskellstack.org",
     "license": "BSD-3-Clause",
-    "version": "1.7.1",
+    "version": "1.9.1",
     "architecture": {
         "64bit": {
-            "url": "https://github.com/commercialhaskell/stack/releases/download/v1.7.1/stack-1.7.1-windows-x86_64.zip",
-            "hash": "0261779ce3598747528547585e78c4e6ad72b70523c9ac3d5c684f2b16791af6"
+            "url": "https://github.com/commercialhaskell/stack/releases/download/v1.9.1/stack-1.9.1-windows-x86_64.zip",
+            "hash": "7b1c22b9171f7a7cd70d776c8853ce7819da949fcccd69e7d87c948ac7e7140f"
         },
         "32bit": {
-            "url": "https://github.com/commercialhaskell/stack/releases/download/v1.7.1/stack-1.7.1-windows-i386.zip",
-            "hash": "0d3df19f11fa15a2fbccc4f55232db42cf68aba43710d3a1bb6d1690b28d59c3"
+            "url": "https://github.com/commercialhaskell/stack/releases/download/v1.9.1/stack-1.9.1-windows-i386.zip",
+            "hash": "049663dafd1c4e5f5d1cf9cb16dc200787fe3ea31d2f04dcd77dd3286e41aa72"
         }
     },
     "bin": [