diff --git a/package.json b/package.json
index 5f04e6da6..e1aae1eda 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "scandal": "^2.2.1",
     "scoped-property-store": "^0.17.0",
     "scrollbar-style": "^3.2",
-    "season": "^5.3",
+    "season": "^5.4",
     "semver": "^4.3.3",
     "service-hub": "^0.7.2",
     "sinon": "1.17.4",
diff --git a/src/package.coffee b/src/package.coffee
index dbc648c7f..3933ceac2 100644
--- a/src/package.coffee
+++ b/src/package.coffee
@@ -251,7 +251,7 @@ class Package
     if @bundledPackage and @packageManager.packagesCache[@name]?
       @keymaps = (["#{@packageManager.resourcePath}#{path.sep}#{keymapPath}", keymapObject] for keymapPath, keymapObject of @packageManager.packagesCache[@name].keymaps)
     else
-      @keymaps = @getKeymapPaths().map (keymapPath) -> [keymapPath, CSON.readFileSync(keymapPath) ? {}]
+      @keymaps = @getKeymapPaths().map (keymapPath) -> [keymapPath, CSON.readFileSync(keymapPath, allowDuplicateKeys: false) ? {}]
     return
 
   loadMenus: ->