diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index cab28db5..7ac30dcb 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -7,6 +7,7 @@ permissions:
 
 env:
   COVERAGE: PartialSummary
+  BUNDLE_WITH: coverage
 
 jobs:
   test:
diff --git a/config/sus.rb b/config/sus.rb
index 7a44c99a..47692930 100644
--- a/config/sus.rb
+++ b/config/sus.rb
@@ -7,8 +7,10 @@
 
 Warning[:experimental] = false
 
-require "covered/sus"
-include Covered::Sus
+if ENV.key?("COVERAGE")
+	require "covered/sus"
+	include Covered::Sus
+end
 
 # Intensive GC checking:
 #
diff --git a/gems.rb b/gems.rb
index efd90062..babeb5a9 100644
--- a/gems.rb
+++ b/gems.rb
@@ -20,7 +20,6 @@
 group :test do
 	gem "sus"
 	gem "sus-fixtures-benchmark"
-	gem "covered"
 	gem "decode"
 	
 	gem "rubocop"
@@ -31,3 +30,7 @@
 	gem "bake-test-external"
 	gem "async"
 end
+
+group :coverage, optional: true do
+	gem "covered"
+end