diff --git a/codegen.go b/codegen.go
index 1c068e0..ff31a10 100644
--- a/codegen.go
+++ b/codegen.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"sort"
 )
 
 // Supported SDK target languages.
@@ -86,11 +87,13 @@ func (g *SDKGenerator) Available() bool {
 	return err == nil
 }
 
-// SupportedLanguages returns the list of supported SDK target languages.
+// SupportedLanguages returns the list of supported SDK target languages
+// in sorted order for deterministic output.
 func SupportedLanguages() []string {
 	langs := make([]string, 0, len(supportedLanguages))
 	for k := range supportedLanguages {
 		langs = append(langs, k)
 	}
+	sort.Strings(langs)
 	return langs
 }