diff --git a/build/appveyor/MING-appveyor-install.bat b/build/appveyor/MING-appveyor-install.bat
index 4b5d730..31b9bd7 100644
--- a/build/appveyor/MING-appveyor-install.bat
+++ b/build/appveyor/MING-appveyor-install.bat
@@ -25,6 +25,9 @@
 CALL cl_setenv.bat                         || EXIT /B
 CALL cl_showenv.bat                        || EXIT /B
 
+SET BOOSTPKG=mingw-w64-x86_64-boost-1.71.0-1-any.pkg.tar.xz
+SET IGNORE=--ignore mingw-w64-x86_64-boost
+
 SET PACKAGES=^
   --needed -S bison flex make ^
   mingw-w64-%MINGWPLAT%-boost ^
@@ -49,3 +52,4 @@
 :: %BASH% -lc "pacman --noconfirm -Su %IGNORE%"                        || EXIT /B
 ::
 %BASH% -lc "pacman --noconfirm %PACKAGES%"                          || EXIT /B
+%BASH% -lc "wget http://repo.msys2.org/mingw/x86_64/%BOOSTPKG% && pacman -- noconfirm --needed -U %BOOSTPKG% && rm %BOOKSTPKG%" || EXIT /B
diff --git a/build/appveyor/MSYS-appveyor-install.bat b/build/appveyor/MSYS-appveyor-install.bat
index a818df3..6357f23 100644
--- a/build/appveyor/MSYS-appveyor-install.bat
+++ b/build/appveyor/MSYS-appveyor-install.bat
@@ -26,7 +26,7 @@
 CALL cl_showenv.bat                        || EXIT /B
 
 :: We're going to keep boost at a version cmake understands
-SET BOOSTPKG=mingw-w64-x86_64-boost-1.64.0-3-any.pkg.tar.xz
+SET BOOSTPKG=mingw-w64-x86_64-boost-1.71.0-1-any.pkg.tar.xz
 SET IGNORE=--ignore mingw-w64-x86_64-boost
 
 SET PACKAGES=^