diff --git a/.changeset/fix-3150-stats-json-decimal-gap-regression.md b/.changeset/fix-3150-stats-json-decimal-gap-regression.md
new file mode 100644
index 000000000..8fd458586
--- /dev/null
+++ b/.changeset/fix-3150-stats-json-decimal-gap-regression.md
@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 3155
+---
+**`stats.json` decimal phase ordering now has explicit regression coverage** — added a fixture ensuring `06.7/06.8/06.9` remain present when `06.10` exists, preventing dropped-phase regressions in mixed decimal phase ranges.
\ No newline at end of file
diff --git a/tests/bug-3150-stats-json-decimal-phase-gaps.test.cjs b/tests/bug-3150-stats-json-decimal-phase-gaps.test.cjs
new file mode 100644
index 000000000..56851750c
--- /dev/null
+++ b/tests/bug-3150-stats-json-decimal-phase-gaps.test.cjs
@@ -0,0 +1,58 @@
+'use strict';
+
+const { test, describe } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { createTempProject, cleanup, runGsdTools } = require('./helpers.cjs');
+
+describe('bug #3150: stats.json includes contiguous decimal phases when .10 exists', () => {
+  test('stats json preserves 06.7/06.8/06.9 alongside 06.10', () => {
+    const tmpDir = createTempProject('gsd-bug-3150-');
+    try {
+      fs.writeFileSync(
+        path.join(tmpDir, '.planning', 'ROADMAP.md'),
+        `# Roadmap\n\n### Phase 06.6: P06.6\n**Goal:** G\n\n### Phase 06.7: P06.7\n**Goal:** G\n\n### Phase 06.8: P06.8\n**Goal:** G\n\n### Phase 06.9: P06.9\n**Goal:** G\n\n### Phase 06.10: P06.10\n**Goal:** G\n`
+      );
+
+      const dirs = ['06.6-a', '06.7-b', '06.8-c', '06.9-d', '06.10-e'];
+      for (const dirName of dirs) {
+        const phaseDir = path.join(tmpDir, '.planning', 'phases', dirName);
+        fs.mkdirSync(phaseDir, { recursive: true });
+        fs.writeFileSync(path.join(phaseDir, 'PLAN.md'), '# plan\n');
+        fs.writeFileSync(path.join(phaseDir, 'SUMMARY.md'), '# summary\n');
+      }
+
+      const result = runGsdTools('stats json', tmpDir);
+      assert.ok(result.success, `Command failed: ${result.error}`);
+
+      let output;
+      assert.doesNotThrow(
+        () => {
+          output = JSON.parse(result.output);
+        },
+        `Command output must be valid JSON. Raw output prefix: ${result.output.slice(0, 200)}`
+      );
+      assert.ok(
+        output && typeof output === 'object' && !Array.isArray(output),
+        `Expected object output, got: ${typeof output}`
+      );
+      assert.ok(
+        Array.isArray(output.phases),
+        `Expected output.phases array. Raw output prefix: ${result.output.slice(0, 200)}`
+      );
+      const phaseNumbers = output.phases.map((p) => p.number);
+
+      assert.deepStrictEqual(
+        phaseNumbers,
+        ['06.6', '06.7', '06.8', '06.9', '06.10'],
+        'stats.json must not skip 06.7/06.8/06.9 when 06.10 exists'
+      );
+      assert.equal(output.phases_total, 5);
+      assert.equal(output.total_plans, 5);
+      assert.equal(output.total_summaries, 5);
+    } finally {
+      cleanup(tmpDir);
+    }
+  });
+});