diff --git a/internal/ruby/plan.go b/internal/ruby/plan.go
index abba32eb..2418b0d9 100644
--- a/internal/ruby/plan.go
+++ b/internal/ruby/plan.go
@@ -10,7 +10,7 @@ import (
 
 // DetermineRubyVersion determines the version of Ruby used in the project.
 func DetermineRubyVersion(source afero.Fs) string {
-	reg := regexp.MustCompile(`ruby "(\d+\.\d+\.\d+)"`)
+	reg := regexp.MustCompile(`ruby ["'](\d+\.\d+\.\d+)["']`)
 	sourceFile, err := afero.ReadFile(source, "Gemfile")
 	if err != nil {
 		return ""