diff --git a/package.json b/package.json
index ce419da95..9b6335b70 100644
--- a/package.json
+++ b/package.json
@@ -121,10 +121,10 @@
     "@types/js-yaml": "4.0.5",
     "@types/luxon": "2.0.9",
     "@types/markdown-it": "12.2.3",
-    "@types/markdown-it-container": "2.0.4",
+    "@types/markdown-it-container": "2.0.5",
     "@types/markdown-it-plantuml": "1.4.1",
     "@types/mermaid": "8.2.7",
-    "@types/node": "16.11.19",
+    "@types/node": "16.11.21",
     "@types/react": "17.0.38",
     "@types/react-bootstrap-typeahead": "5.1.8",
     "@types/react-dom": "17.0.11",
diff --git a/src/components/markdown-renderer/markdown-extension/spoiler-markdown-extension.ts b/src/components/markdown-renderer/markdown-extension/spoiler-markdown-extension.ts
index cd05dd78e..ad9b3fcbf 100644
--- a/src/components/markdown-renderer/markdown-extension/spoiler-markdown-extension.ts
+++ b/src/components/markdown-renderer/markdown-extension/spoiler-markdown-extension.ts
@@ -13,24 +13,22 @@ import { escapeHtml } from 'markdown-it/lib/common/utils'
 export class SpoilerMarkdownExtension extends MarkdownExtension {
   private static readonly spoilerRegEx = /^spoiler\s+(.*)$/
 
-  private createSpoilerContainer(): (tokens: Token[], index: number) => void {
-    return (tokens: Token[], index: number) => {
-      const matches = SpoilerMarkdownExtension.spoilerRegEx.exec(tokens[index].info.trim())
+  private static createSpoilerContainer(tokens: Token[], index: number): string {
+    const matches = SpoilerMarkdownExtension.spoilerRegEx.exec(tokens[index].info.trim())
 
-      if (tokens[index].nesting === 1 && matches && matches[1]) {
-        // opening tag
-        return `<details><summary>${escapeHtml(matches[1])}</summary>`
-      } else {
-        // closing tag
-        return '</details>\n'
-      }
+    if (tokens[index].nesting === 1 && matches && matches[1]) {
+      // opening tag
+      return `<details><summary>${escapeHtml(matches[1])}</summary>`
+    } else {
+      // closing tag
+      return '</details>\n'
     }
   }
 
   public configureMarkdownIt(markdownIt: MarkdownIt): void {
     markdownItContainer(markdownIt, 'spoiler', {
       validate: (params: string) => SpoilerMarkdownExtension.spoilerRegEx.test(params),
-      render: () => this.createSpoilerContainer()
+      render: SpoilerMarkdownExtension.createSpoilerContainer.bind(this)
     })
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 531eab213..82186172e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1637,10 +1637,10 @@ __metadata:
     "@types/js-yaml": 4.0.5
     "@types/luxon": 2.0.9
     "@types/markdown-it": 12.2.3
-    "@types/markdown-it-container": 2.0.4
+    "@types/markdown-it-container": 2.0.5
     "@types/markdown-it-plantuml": 1.4.1
     "@types/mermaid": 8.2.7
-    "@types/node": 16.11.19
+    "@types/node": 16.11.21
     "@types/react": 17.0.38
     "@types/react-bootstrap-typeahead": 5.1.8
     "@types/react-dom": 17.0.11
@@ -3058,12 +3058,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/markdown-it-container@npm:2.0.4":
-  version: 2.0.4
-  resolution: "@types/markdown-it-container@npm:2.0.4"
+"@types/markdown-it-container@npm:2.0.5":
+  version: 2.0.5
+  resolution: "@types/markdown-it-container@npm:2.0.5"
   dependencies:
     "@types/markdown-it": "*"
-  checksum: 4aa5b0a492266a3ee6f43537ed358e49d218442e7d7e01a54f88e5b7155d00a2944f0fc3445580825ca871ab295b220dabcd303ea1b548deef8aa851dd37c7f6
+  checksum: 33e47d2461dcf2203458fd10f2c0f7e15271b61615f00a8d69176668546ecd498844c6f9fb6f12df627e35909221aada091b1fdc7a185cafba8ec07791dfa710
   languageName: node
   linkType: hard
 
@@ -3107,10 +3107,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:16.11.19":
-  version: 16.11.19
-  resolution: "@types/node@npm:16.11.19"
-  checksum: a9ba0cd1e61c8ad50f3fc9c2b37b795bf0286dacb39dcc985da90328abf0c5151dffe9932d20bc9a6a52c3ce7bfc1e5a7c2dc1416480fb84f1c2d70e25caeba0
+"@types/node@npm:16.11.21":
+  version: 16.11.21
+  resolution: "@types/node@npm:16.11.21"
+  checksum: 75b679dc6375cf09bc14a2d1b344be6f3fd8ea50f212b0d60970dc9e175cef45e44c284c716eb9e766ffa52d0c83b689adb3d1911b6dd8649c560b8f77442a22
   languageName: node
   linkType: hard