diff --git a/script/SUPPORTED_VERSIONS b/script/SUPPORTED_VERSIONS
deleted file mode 100644
index c30e9190..00000000
--- a/script/SUPPORTED_VERSIONS
+++ /dev/null
@@ -1 +0,0 @@
-2.4.1 2.3.5 2.2.7
diff --git a/script/install_gems_in_all_appraisals b/script/install_gems_in_all_appraisals
index 749a2e9c..1ba61167 100755
--- a/script/install_gems_in_all_appraisals
+++ b/script/install_gems_in_all_appraisals
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-SUPPORTED_VERSIONS=$(<script/SUPPORTED_VERSIONS)
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
 
 install-gems-for-version() {
   local version="$1"
diff --git a/script/run_all_tests b/script/run_all_tests
index 7ba8bfaa..f610f3d8 100755
--- a/script/run_all_tests
+++ b/script/run_all_tests
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-SUPPORTED_VERSIONS=$(<script/SUPPORTED_VERSIONS)
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
 
 run-tests-for-version() {
   local version="$1"
diff --git a/script/supported_ruby_versions b/script/supported_ruby_versions
new file mode 100755
index 00000000..003e2b1c
--- /dev/null
+++ b/script/supported_ruby_versions
@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+require 'yaml'
+
+travis_config_path = File.expand_path('../../.travis.yml', __FILE__)
+travis_config = YAML.load_file(travis_config_path)
+puts travis_config.fetch('rvm').join(' ')
diff --git a/script/update_gem_in_all_appraisals b/script/update_gem_in_all_appraisals
index 7fc393b6..51694bb5 100755
--- a/script/update_gem_in_all_appraisals
+++ b/script/update_gem_in_all_appraisals
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-SUPPORTED_VERSIONS=$(<script/SUPPORTED_VERSIONS)
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
 gem="$1"
 
 update-gem-for-version() {
diff --git a/script/update_gems_in_all_appraisals b/script/update_gems_in_all_appraisals
index 6b1b2f27..d2ac309a 100755
--- a/script/update_gems_in_all_appraisals
+++ b/script/update_gems_in_all_appraisals
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-SUPPORTED_VERSIONS=$(<script/SUPPORTED_VERSIONS)
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
 
 update-gems-for-version() {
   local version="$1"