diff --git a/cmd/core-lint/main.go b/cmd/core-lint/main.go
index 012cd41..2d0ba47 100644
--- a/cmd/core-lint/main.go
+++ b/cmd/core-lint/main.go
@@ -197,7 +197,7 @@ func addLintCommands(root *cli.Command) {
 		if err != nil {
 			return err
 		}
-		fmt.Println(string(data))
+		cli.Print("%s\n", string(data))
 		return nil
 	})
 
diff --git a/cmd/qa/cmd_docblock.go b/cmd/qa/cmd_docblock.go
index e85b55a..ad6da35 100644
--- a/cmd/qa/cmd_docblock.go
+++ b/cmd/qa/cmd_docblock.go
@@ -93,7 +93,7 @@ func RunDocblockCheck(paths []string, threshold float64, verbose, jsonOutput boo
 		if err != nil {
 			return err
 		}
-		fmt.Println(string(data))
+		cli.Print("%s\n", string(data))
 		if !result.Passed {
 			return cli.Err("docblock coverage %.1f%% below threshold %.1f%%", result.Coverage, threshold)
 		}
diff --git a/cmd/qa/cmd_php.go b/cmd/qa/cmd_php.go
index 4067325..9176fca 100644
--- a/cmd/qa/cmd_php.go
+++ b/cmd/qa/cmd_php.go
@@ -252,7 +252,7 @@ func addPHPAuditCommand(parent *cli.Command) {
 				if err != nil {
 					return err
 				}
-				fmt.Println(string(data))
+				cli.Print("%s\n", string(data))
 
 				if payload.HasVulnerabilities {
 					return cli.Err("vulnerabilities found in dependencies")
@@ -344,7 +344,7 @@ func addPHPSecurityCommand(parent *cli.Command) {
 				if err != nil {
 					return err
 				}
-				fmt.Println(string(data))
+				cli.Print("%s\n", string(data))
 
 				summary := result.Summary
 				if summary.Critical > 0 || summary.High > 0 {
@@ -358,7 +358,7 @@ func addPHPSecurityCommand(parent *cli.Command) {
 				if err != nil {
 					return err
 				}
-				fmt.Println(string(data))
+				cli.Print("%s\n", string(data))
 
 				summary := result.Summary
 				if summary.Critical > 0 || summary.High > 0 {
diff --git a/cmd/qa/cmd_review.go b/cmd/qa/cmd_review.go
index db11664..308bf8c 100644
--- a/cmd/qa/cmd_review.go
+++ b/cmd/qa/cmd_review.go
@@ -212,7 +212,7 @@ func runReview() error {
 		if err != nil {
 			return err
 		}
-		fmt.Println(string(data))
+		cli.Print("%s\n", string(data))
 		if successfulFetches == 0 && len(fetchErrors) > 0 {
 			return cli.Err("failed to fetch pull requests for %s", repoFullName)
 		}
diff --git a/pkg/lint/catalog.go b/pkg/lint/catalog.go
index 1f09638..5494259 100644
--- a/pkg/lint/catalog.go
+++ b/pkg/lint/catalog.go
@@ -30,6 +30,7 @@ func LoadDir(dir string) (*Catalog, error) {
 	if err != nil {
 		return nil, coreerr.E("Catalog.LoadDir", "loading catalog from "+dir, err)
 	}
+	sortDirEntries(entries)
 
 	var rules []Rule
 	for _, entry := range entries {
@@ -56,6 +57,7 @@ func LoadFS(fsys fs.FS, dir string) (*Catalog, error) {
 	if err != nil {
 		return nil, coreerr.E("Catalog.LoadFS", "loading catalog from embedded "+dir, err)
 	}
+	sortDirEntries(entries)
 
 	var rules []Rule
 	for _, entry := range entries {
@@ -76,6 +78,12 @@ func LoadFS(fsys fs.FS, dir string) (*Catalog, error) {
 	return &Catalog{Rules: rules}, nil
 }
 
+func sortDirEntries(entries []fs.DirEntry) {
+	slices.SortFunc(entries, func(a, b fs.DirEntry) int {
+		return strings.Compare(a.Name(), b.Name())
+	})
+}
+
 // ForLanguage returns all rules that apply to the given language.
 func (c *Catalog) ForLanguage(lang string) []Rule {
 	var result []Rule
diff --git a/pkg/lint/catalog_test.go b/pkg/lint/catalog_test.go
index 8d04f85..f2e1837 100644
--- a/pkg/lint/catalog_test.go
+++ b/pkg/lint/catalog_test.go
@@ -29,6 +29,38 @@ func TestLoadDir_Good(t *testing.T) {
 	assert.NotNil(t, cat.ByID("go-mod-001"))
 }
 
+func TestLoadDir_SortsFilesDeterministically(t *testing.T) {
+	dir := t.TempDir()
+
+	err := os.WriteFile(filepath.Join(dir, "z.yaml"), []byte(`- id: z-rule
+  title: "Z rule"
+  severity: info
+  languages: [go]
+  pattern: 'z'
+  fix: "z"
+  detection: regex
+  auto_fixable: false
+`), 0o644)
+	require.NoError(t, err)
+
+	err = os.WriteFile(filepath.Join(dir, "a.yaml"), []byte(`- id: a-rule
+  title: "A rule"
+  severity: info
+  languages: [go]
+  pattern: 'a'
+  fix: "a"
+  detection: regex
+  auto_fixable: false
+`), 0o644)
+	require.NoError(t, err)
+
+	cat, err := LoadDir(dir)
+	require.NoError(t, err)
+	require.Len(t, cat.Rules, 2)
+	assert.Equal(t, "a-rule", cat.Rules[0].ID)
+	assert.Equal(t, "z-rule", cat.Rules[1].ID)
+}
+
 func TestLoadDir_Bad_NonexistentDir(t *testing.T) {
 	_, err := LoadDir("/nonexistent/path/that/does/not/exist")
 	assert.Error(t, err)