diff --git a/.babelrc b/.babelrc
index 58d1332..af7d71c 100644
--- a/.babelrc
+++ b/.babelrc
@@ -2,11 +2,10 @@
                , { "targets": { "browsers": [ "last 2 chrome versions"
                                             , "last 2 chromeandroid versions"
                                             , "firefox esr"
-                                            , "not firefox 52"
                                             , "last 2 firefox versions"
-                                            , "edge >= 15"
-                                            , "safari >= 11"
-                                            , "ios >= 11"
+                                            , "edge >= 17"
+                                            , "safari >= 12"
+                                            , "ios >= 12"
                                             ]
                               }
                  , "debug": true