diff --git a/.bundle/config b/.bundle/config
new file mode 100644
index 0000000..e5eb0a7
--- /dev/null
+++ b/.bundle/config
@@ -0,0 +1,2 @@
+---
+BUNDLE_WITHOUT: "typing"
diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
index d9b97eb..6792907 100644
--- a/.github/workflows/rspec.yml
+++ b/.github/workflows/rspec.yml
@@ -19,17 +19,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
-
-      - name: Cache gems
-        uses: actions/cache@v3
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-rspec-${{ matrix.ruby-version }}-${{ hashFiles('Gemfile.lock') }}
-          restore-keys:
-            ${{ runner.os }}-rspec-${{ matrix.ruby-version }}-
-
-      - name: Install gems
-        run: bundle install --jobs 4 --retry 3
+          bundler-cache: true
 
       - name: Run RSpec
         run: bundle exec rspec
diff --git a/Steepfile b/Steepfile
index a9bffad..7f4e0c0 100644
--- a/Steepfile
+++ b/Steepfile
@@ -7,11 +7,3 @@ target :lib do
   library "pathname"
   library "date"
 end
-
-target :test do
-  signature "sig"
-  check "test"
-  configure_code_diagnostics(D::Ruby.default)
-  library "pathname"
-  library "date"
-end
diff --git a/sig/environment_helpers.rbs b/sig/environment_helpers.rbs
index c8059af..26b8308 100644
--- a/sig/environment_helpers.rbs
+++ b/sig/environment_helpers.rbs
@@ -36,8 +36,7 @@ module EnvironmentHelpers
 
   module AccessHelpers
     # (Actually provided by ENV, which these are all extended onto)
-    def fetch: (String name) -> String?
-             | (String name, String? default) -> String?
+    def fetch: (String name, ?String? default) -> String?
 
     private def fetch_value: (String name, required: bool) -> String?
     private def check_default_type: (String | Symbol context, untyped value, *Class types) -> void