Gemfile in blacklight-5.3.0 vs Gemfile in blacklight-5.4.0.rc1

@@ -2,10 +2,12 @@
 
 # Please see blacklight.gemspec for dependency information.
 gemspec path: File.expand_path('..', __FILE__)
 
 
-gem 'simplecov', require: false
+# Peg simplecov to < 0.8 until this is resolved:
+# https://github.com/colszowka/simplecov/issues/281
+gem 'simplecov', '~> 0.7.1', require: false
 gem 'coveralls', require: false
 
 gem 'engine_cart', '~> 0.3.0'
 
 group :test do