diff --git a/artiq/windows/default.nix b/artiq/windows/default.nix
index a840915..b01eacc 100644
--- a/artiq/windows/default.nix
+++ b/artiq/windows/default.nix
@@ -1,7 +1,7 @@
 { pkgs ? import <nixpkgs> {},
   diskImage ? "/opt/windows/c.img",
   qemuMem ? "2G",
-  testTimeout ? 120,
+  testTimeout ? 180,
   artiqPkg ? import ../conda-artiq.nix { inherit pkgs; },
 }:
 
diff --git a/artiq/windows/install.nix b/artiq/windows/install.nix
index 7643aa4..1786b45 100644
--- a/artiq/windows/install.nix
+++ b/artiq/windows/install.nix
@@ -1,5 +1,5 @@
 { pkgs ? import <nixpkgs> {},
-  diskImageSize ? "20G",
+  diskImageSize ? "22G",
   qemuMem ? "4G",
 }: