diff --git a/changelogs/unreleased/sh-upgrade-katex-0-9-0.yml b/changelogs/unreleased/sh-upgrade-katex-0-9-0.yml
new file mode 100644
index 00000000000..2a27e37c053
--- /dev/null
+++ b/changelogs/unreleased/sh-upgrade-katex-0-9-0.yml
@@ -0,0 +1,5 @@
+---
+title: Bump KaTeX version to 0.9.0
+merge_request: 21625
+author:
+type: fixed
diff --git a/package.json b/package.json
index 76c816cf2a6..f95f1d55363 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
     "js-cookie": "^2.1.3",
     "jszip": "^3.1.3",
     "jszip-utils": "^0.0.2",
-    "katex": "^0.8.3",
+    "katex": "^0.9.0",
     "marked": "^0.3.12",
     "monaco-editor": "^0.14.3",
     "monaco-editor-webpack-plugin": "^1.5.2",
diff --git a/yarn.lock b/yarn.lock
index 2fb9760ddae..5e15b1acc90 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4718,11 +4718,11 @@ karma@^2.0.4:
     tmp "0.0.33"
     useragent "2.2.1"
 
-katex@^0.8.3:
-  version "0.8.3"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.8.3.tgz#909d99864baf964c3ccae39c4a99a8e0fb9a1bd0"
+katex@^0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.9.0.tgz#26a7d082c21d53725422d2d71da9b2d8455fbd4a"
   dependencies:
-    match-at "^0.1.0"
+    match-at "^0.1.1"
 
 keyv@3.0.0:
   version "3.0.0"
@@ -5033,7 +5033,7 @@ marked@^0.3.12:
   version "0.3.12"
   resolved "https://registry.yarnpkg.com/marked/-/marked-0.3.12.tgz#7cf25ff2252632f3fe2406bde258e94eee927519"
 
-match-at@^0.1.0:
+match-at@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/match-at/-/match-at-0.1.1.tgz#25d040d291777704d5e6556bbb79230ec2de0540"