diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d1a2d6c..e06094b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Change Log
 
+### 2.7.0
+
+* Add support for env var `KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE` to allow accepting file containing test files to run.
+    
+    https://github.com/KnapsackPro/knapsack_pro-ruby/pull/129
+
+https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v2.6.0...v2.7.0
+
 ### 2.6.0
 
 * Improve logger to show failed requests URL and when retry will happen
diff --git a/README.md b/README.md
index 145caa02..9184e15e 100644
--- a/README.md
+++ b/README.md
@@ -3082,7 +3082,9 @@ The test file pattern and exclude pattern support any glob pattern handled by [`
 
 #### How to run a specific list of test files or only some tests from test file?
 
-:information_source: If you don't want to use the pattern [`KNAPSACK_PRO_TEST_FILE_PATTERN`](#how-can-i-run-tests-from-multiple-directories) to define a list of tests to run then read below.
+:information_source: If you don't want to use the pattern [`KNAPSACK_PRO_TEST_FILE_PATTERN`](#how-can-i-run-tests-from-multiple-directories) to define a list of tests to run then read below two options.
+
+**Option 1:**  
 
 If you want to run a specific list of test files that are explicitly defined by you or auto-generated by some kind of script you created then please use:
 
@@ -3090,7 +3092,24 @@ If you want to run a specific list of test files that are explicitly defined by
 
 Note `KNAPSACK_PRO_TEST_FILE_LIST` must be a list of test files comma separated. You can provide line number for tests inside of spec file in case of RSpec (this way you can run only one test or a group of tests from RSpec spec file). You can provide the same file a few times with different test line number.
 
-Note when you set `KNAPSACK_PRO_TEST_FILE_LIST` then below environment variables are ignored:
+**Option 2:** 
+
+Similarly, you can also provide a source file containing the test files that you would like to run. For example:
+`KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE=spec/fixtures/test_file_list_source_file.txt`  
+And the content of the source file can be any of the format below:
+
+```
+./spec/test1_spec.rb
+spec/test2_spec.rb[1]
+./spec/test3_spec.rb[1:2:3:4]
+./spec/test4_spec.rb:4
+./spec/test4_spec.rb:5
+```
+
+> Note that each of the line must be ending with `\n` the new line.
+
+Note when you set `KNAPSACK_PRO_TEST_FILE_LIST` or `KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE` then below environment variables are ignored:
+
 * `KNAPSACK_PRO_TEST_FILE_PATTERN`
 * `KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN`
 
diff --git a/lib/knapsack_pro/config/env.rb b/lib/knapsack_pro/config/env.rb
index 0b7b3d5f..bc3d1c02 100644
--- a/lib/knapsack_pro/config/env.rb
+++ b/lib/knapsack_pro/config/env.rb
@@ -74,6 +74,10 @@ def test_file_list
           ENV['KNAPSACK_PRO_TEST_FILE_LIST']
         end
 
+        def test_file_list_source_file
+          ENV['KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE']
+        end  
+
         def test_dir
           ENV['KNAPSACK_PRO_TEST_DIR']
         end
diff --git a/lib/knapsack_pro/test_file_finder.rb b/lib/knapsack_pro/test_file_finder.rb
index c66ba280..457e0645 100644
--- a/lib/knapsack_pro/test_file_finder.rb
+++ b/lib/knapsack_pro/test_file_finder.rb
@@ -63,6 +63,10 @@ def test_files
         return KnapsackPro::Config::Env.test_file_list.split(',').map(&:strip)
       end
 
+      if test_file_list_enabled && KnapsackPro::Config::Env.test_file_list_source_file
+        return File.read(KnapsackPro::Config::Env.test_file_list_source_file).split(/\n/)
+      end
+
       test_file_paths = Dir.glob(test_file_pattern).uniq
 
       excluded_test_file_paths =
diff --git a/spec/fixtures/test_file_list_source_file.txt b/spec/fixtures/test_file_list_source_file.txt
new file mode 100644
index 00000000..e827c5a0
--- /dev/null
+++ b/spec/fixtures/test_file_list_source_file.txt
@@ -0,0 +1,5 @@
+./spec/test1_spec.rb
+spec/test2_spec.rb[1]
+./spec/test3_spec.rb[1:2:3:4]
+./spec/test4_spec.rb:4
+./spec/test4_spec.rb:5
diff --git a/spec/knapsack_pro/config/env_spec.rb b/spec/knapsack_pro/config/env_spec.rb
index 45531d08..45dbe14e 100644
--- a/spec/knapsack_pro/config/env_spec.rb
+++ b/spec/knapsack_pro/config/env_spec.rb
@@ -238,6 +238,20 @@
     end
   end
 
+  describe '.test_file_list_source_file' do
+    subject { described_class.test_file_list_source_file }
+
+    context 'when ENV exists' do
+      let(:test_file_list_source_file) { 'spec/fixtures/test_file_list_source_file.txt' }
+      before { stub_const("ENV", { 'KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE' => test_file_list_source_file }) }
+      it { should eq test_file_list_source_file }
+    end
+
+    context "when ENV doesn't exist" do
+      it { should be_nil }
+    end
+  end
+
   describe '.test_dir' do
     subject { described_class.test_dir }
 
diff --git a/spec/knapsack_pro/test_file_finder_spec.rb b/spec/knapsack_pro/test_file_finder_spec.rb
index 56345318..eb4cd4fe 100644
--- a/spec/knapsack_pro/test_file_finder_spec.rb
+++ b/spec/knapsack_pro/test_file_finder_spec.rb
@@ -154,5 +154,23 @@
         end
       end
     end
+
+    context 'when KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE is defined' do
+      let(:test_file_list_source_file) { 'spec/fixtures/test_file_list_source_file.txt' }
+
+      before do
+        stub_const("ENV", { 'KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE' => test_file_list_source_file })
+      end
+
+      it do
+        expect(subject).to eq([
+          { 'path' => 'spec/test1_spec.rb' },
+          { 'path' => 'spec/test2_spec.rb[1]' },
+          { 'path' => 'spec/test3_spec.rb[1:2:3:4]' },
+          { 'path' => 'spec/test4_spec.rb:4' },
+          { 'path' => 'spec/test4_spec.rb:5' },
+        ])
+      end
+    end
   end
 end