diff --git a/appveyor.yml b/appveyor.yml
index e51ddab..bb78ad3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,8 +14,8 @@ environment:
     # `rust_eh_unwind_resume` in the debug LTO builds that aren't optimized out,
     # so we skip that test for now. Would be great to not skip it!
     - TARGET: i686-pc-windows-gnu
-      MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
-      MINGW_ARCHIVE: i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z
+      MINGW_URL: https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror
+      MINGW_ARCHIVE: i686-6.3.0-release-win32-dwarf-rt_v5-rev1.7z
       MINGW_DIR: mingw32
       DEBUG_LTO_BUILD_DOESNT_WORK: 1
     - TARGET: x86_64-pc-windows-gnu