diff --git a/README.md b/README.md
index 5e0f72d..e6b229b 100644
--- a/README.md
+++ b/README.md
@@ -203,7 +203,9 @@ by passing the `-DENABLE_GUI=OFF` flag to the cmake invocation.
 Building on Windows
 -------------------
 
-You will need [git][gitwin], [cmake][cmakewin] and Visual C++.
+You will need [git][gitwin], [cmake][cmakewin] and a C++ compiler
+(either Visual C++ or MinGW). If using Visual C++, Visual Studio 2015
+or later is required.
 
 ### Building with Visual Studio IDE
 
diff --git a/appveyor.yml b/appveyor.yml
index bb4c6d9..e2c632a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,7 +5,7 @@ before_build:
   - set tag=x%APPVEYOR_REPO_TAG_NAME%
   - if %tag:~,2% == xv (set BUILD_TYPE=RelWithDebInfo) else (set BUILD_TYPE=Debug)
   - mkdir build
-  - cmake -G"Visual Studio 12" -Tv120 -Bbuild -H.
+  - cmake -G"Visual Studio 14" -Tv140 -Bbuild -H.
 build_script:
   - msbuild "build\src\solvespace.vcxproj" /verbosity:minimal /property:Configuration=%BUILD_TYPE% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
   - msbuild "build\src\solvespace-cli.vcxproj" /verbosity:minimal /property:Configuration=%BUILD_TYPE% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"