diff --git a/.gitignore b/.gitignore
index 9106b2a..ac51ff7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 /pkg/
 /spec/reports/
 /tmp/
+file_cache_test.yaml
diff --git a/lib/ruber/configuration.rb b/lib/ruber/configuration.rb
index 768ec6e..c4661a7 100644
--- a/lib/ruber/configuration.rb
+++ b/lib/ruber/configuration.rb
@@ -1,13 +1,14 @@
 # frozen_string_literal: true
 
 require_relative "configuration/null_cache"
+require_relative "configuration/file_cache"
 
 module Ruber
   class Configuration
-    attr_accessor :customer_id, :client_id, :client_secret
+    attr_accessor :customer_id, :client_id, :client_secret, :file_cache_path
 
     def cache
-      @cache ||= NullCache.new
+      @cache ||= FileCache.new
     end
 
     def cache=(store)
diff --git a/lib/ruber/configuration/file_cache.rb b/lib/ruber/configuration/file_cache.rb
new file mode 100644
index 0000000..9de0a59
--- /dev/null
+++ b/lib/ruber/configuration/file_cache.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require "yaml/store"
+
+module Ruber
+  class FileCache
+    def initialize
+      raise "FileCache requires a file path" unless Ruber.configuration.file_cache_path
+
+      @store = YAML::Store.new(Ruber.configuration.file_cache_path)
+    end
+
+    def read(key) = @store.transaction { @store[key] }
+    def write(key, value) = @store.transaction { @store[key] = value }
+
+    def clear
+      File.delete(Ruber.configuration.file_cache_path) if File.exist?(Ruber.configuration.file_cache_path)
+    end
+
+    def delete(key) = @store.transaction { @store.delete(key) }
+  end
+end
diff --git a/test/ruber/authenticator_test.rb b/test/ruber/authenticator_test.rb
index a330617..a4730ef 100644
--- a/test/ruber/authenticator_test.rb
+++ b/test/ruber/authenticator_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "test_helper"
+require File.expand_path("../test_helper", __dir__)
 require "webmock/minitest"
 
 module Ruber
diff --git a/test/ruber/configuration/file_cache_test.rb b/test/ruber/configuration/file_cache_test.rb
new file mode 100644
index 0000000..2c5e0b2
--- /dev/null
+++ b/test/ruber/configuration/file_cache_test.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require File.expand_path("../../test_helper", __dir__)
+require "yaml/store"
+require "fileutils"
+
+module Ruber
+  class FileCacheTest < Minitest::Test
+    def setup
+      File.delete(Ruber.configuration.file_cache_path) if File.exist?(Ruber.configuration.file_cache_path)
+
+      @cache = FileCache.new
+    end
+
+    def teardown
+      @cache.clear
+    end
+
+    def test_initialize_raises_error_if_no_file_path
+      Ruber.configuration.stub :file_cache_path, nil do
+        assert_raises(RuntimeError, "FileCache requires a file path") do
+          FileCache.new
+        end
+      end
+    end
+
+    def test_write_and_read
+      @cache.write("foo", "bar")
+      assert_equal "bar", @cache.read("foo")
+    end
+
+    def test_write_and_read_complex_object
+      @cache.write("foo", { foo: "bar", bar: "baz" })
+      assert_equal "bar", @cache.read("foo")[:foo]
+      assert_equal "baz", @cache.read("foo")[:bar]
+    end
+
+    def test_delete
+      @cache.write("key", "value")
+      @cache.delete("key")
+      assert_nil @cache.read("key")
+    end
+
+    def test_clear
+      @cache.write("key1", "value1")
+      @cache.write("key2", "value2")
+
+      @cache.clear
+      assert_nil @cache.read("key1")
+      assert_nil @cache.read("key2")
+    end
+
+    def test_clear_and_write_again
+      @cache.write("key1", "value1")
+      @cache.write("key2", "value1")
+      @cache.clear
+      @cache.write("key1", "value2")
+
+      assert "value2", @cache.read("key1")
+      assert_nil @cache.read("key2")
+    end
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 312aa10..f4149ef 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,7 +1,16 @@
 # frozen_string_literal: true
 
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
-require "ruber"
 
 require "minitest/autorun"
 require "webmock/minitest"
+
+require "ruber"
+
+class Minitest::Test # rubocop:disable Style/ClassAndModuleChildren
+  def before_setup
+    super
+
+    Ruber.configuration.file_cache_path = "file_cache_test.yaml"
+  end
+end