diff --git a/appveyor.yml b/appveyor.yml
index e9686b5..8d44ac3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -22,10 +22,10 @@ install:
 - ps: >
     if((Test-Path $env:STACK_ROOT) -ne $true) {
       if($env:PLATFORM -eq 'x86') {
-        $stackUrl = 'https://www.stackage.org/stack/windows-i386';
+        $stackUrl = 'https://github.com/commercialhaskell/stack/releases/download/v1.6.5/stack-1.6.5-windows-i386.zip';
       }
       elseif($env:PLATFORM -eq 'x64') {
-        $stackUrl = 'https://www.stackage.org/stack/windows-x86_64';
+        $stackUrl = 'https://github.com/commercialhaskell/stack/releases/download/v1.6.5/stack-1.6.5-windows-x86_64.zip';
       }
       Invoke-WebRequest -OutFile C:\stack.zip $stackUrl;
       Add-Type -AssemblyName System.IO.Compression.FileSystem;
diff --git a/stack.yaml b/stack.yaml
index 9fa26ba..10e6942 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -4,9 +4,14 @@ packages:
 - '.'
 extra-deps:
 - uri-0.1.6.4
+- Win32-2.6.2.0
 ## INSERT CODECOV HERE -- DO NOT REMOVE THIS COMMENT. SEE ALSO ISSUE #156. ##
 extra-package-dbs: []
 ghc-options:
   "$locals": -fhide-source-paths
 # http://hsyl20.fr/home/posts/2018-01-15-ghc-hiding-source-and-object-paths.html
-require-stack-version: ">=1.6.5"
+
+require-stack-version:
+  # CHECK: If we change the minimum version of Stack the download URLs in
+  # *appveyor.yml* file also should be updated.
+  ">=1.6.5"