diff --git a/package-lock.json b/package-lock.json
index e1bce5584..8688a2365 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -68,7 +68,7 @@
         "katex": "0.16.19",
         "knockout": "3.5.1",
         "mark.js": "8.11.1",
-        "marked": "15.0.5",
+        "marked": "15.0.6",
         "mermaid": "11.4.1",
         "mime-types": "2.1.35",
         "mind-elixir": "4.3.5",
@@ -13058,9 +13058,9 @@
       }
     },
     "node_modules/marked": {
-      "version": "15.0.5",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-15.0.5.tgz",
-      "integrity": "sha512-xN+kSuqHjxWg+Q47yhhZMUP+kO1qHobvXkkm6FX+7N6lDvanLDd8H7AQ0jWDDyq+fDt/cSrJaBGyWYHXy0KQWA==",
+      "version": "15.0.6",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-15.0.6.tgz",
+      "integrity": "sha512-Y07CUOE+HQXbVDCGl3LXggqJDbXDP2pArc2C1N1RRMN0ONiShoSsIInMd5Gsxupe7fKLpgimTV+HOJ9r7bA+pg==",
       "license": "MIT",
       "bin": {
         "marked": "bin/marked.js"
diff --git a/package.json b/package.json
index 33eca06b8..f43c9d0d2 100644
--- a/package.json
+++ b/package.json
@@ -113,7 +113,7 @@
     "katex": "0.16.19",
     "knockout": "3.5.1",
     "mark.js": "8.11.1",
-    "marked": "15.0.5",
+    "marked": "15.0.6",
     "mermaid": "11.4.1",
     "mime-types": "2.1.35",
     "mind-elixir": "4.3.5",
diff --git a/spec/services/export/md.spec.ts b/src/services/export/md.spec.ts
similarity index 90%
rename from spec/services/export/md.spec.ts
rename to src/services/export/md.spec.ts
index b9e32ef86..38ea83c96 100644
--- a/spec/services/export/md.spec.ts
+++ b/src/services/export/md.spec.ts
@@ -1,5 +1,5 @@
-import markdownExportService from "../../../src/services/export/md.js";
-import { trimIndentation } from "../../support/utils.js";
+import markdownExportService from "./md.js";
+import { trimIndentation } from "../../../spec/support/utils.js";
 
 describe("Markdown export", () => {
     it("trims language tag for code blocks", () => {
diff --git a/src/services/import/markdown.spec.ts b/src/services/import/markdown.spec.ts
new file mode 100644
index 000000000..a09592210
--- /dev/null
+++ b/src/services/import/markdown.spec.ts
@@ -0,0 +1,19 @@
+import { trimIndentation } from "../../../spec/support/utils.js";
+import markdownService from "./markdown.js";
+
+describe("markdown", () => {
+    it("converts h1 heading", () => {
+        const result = markdownService.renderToHtml(trimIndentation`\
+            # Hello
+            ## world
+            # another one
+            Hello, world
+        `, "title");
+        expect(result).toBe(trimIndentation`\
+            <h2>Hello</h2>
+            <h2>world</h2>
+            <h2>another one</h2>
+            <p>Hello, world</p>
+        `);
+    });
+});