1 files changed, 1 insertions, 1 deletions
diff --git a/grunt/postcss.js b/grunt/postcss.js
index 7e7eb4a7e..a2ea78f5b 100644
--- a/grunt/postcss.js
+++ b/grunt/postcss.js
@@ -29,7 +29,7 @@ module.exports = {
       // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
       // See also https://github.com/Fyrd/caniuse/issues/1928
       'Edge >= 12',
-      'Explorer >= 9',
+      'Explorer >= 10',
       // Out of leniency, we prefix these 1 version further back than the official policy.
       'iOS >= 8',
       'Safari >= 8',