diff --git a/ui/browserslist b/ui/browserslist
index 80848532e..e8ec33b68 100644
--- a/ui/browserslist
+++ b/ui/browserslist
@@ -8,5 +8,4 @@
 > 0.5%
 last 2 versions
 Firefox ESR
-not dead
-not IE 9-11 # For IE 9-11 support, remove 'not'.
\ No newline at end of file
+IE 11
\ No newline at end of file
diff --git a/ui/tsconfig.json b/ui/tsconfig.json
index 588c8d782..5731a73e0 100644
--- a/ui/tsconfig.json
+++ b/ui/tsconfig.json
@@ -10,7 +10,7 @@
         "experimentalDecorators": true,
         "allowSyntheticDefaultImports": true,
         "downlevelIteration": true,
-        "target": "es2015",
+        "target": "es5",
         "typeRoots": [
             "node_modules/@types"
         ],