diff --git a/package.json b/package.json
index 603e6d85a0..5fdd82bb24 100644
--- a/package.json
+++ b/package.json
@@ -175,7 +175,7 @@
         "mkdirp": "^3.0.0",
         "modernizr": "^3.12.0",
         "node-fetch": "^2.6.7",
-        "postcss": "8.4.39",
+        "postcss": "8.4.38",
         "postcss-easings": "^4.0.0",
         "postcss-hexrgba": "2.1.0",
         "postcss-import": "16.1.0",
diff --git a/yarn.lock b/yarn.lock
index 2485b8bae1..ea563b8d90 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7978,15 +7978,16 @@ matrix-mock-request@^2.5.0:
   resolved "https://codeload.github.com/matrix-org/matrix-react-sdk/tar.gz/19f9f9856451a8e4cce6d313d19ca8aed4b5d6b4"
   dependencies:
     "@babel/runtime" "^7.12.5"
-    "@matrix-org/analytics-events" "^0.24.0"
+    "@matrix-org/analytics-events" "^0.23.0"
     "@matrix-org/emojibase-bindings" "^1.1.2"
-    "@matrix-org/matrix-wysiwyg" "2.37.4"
+    "@matrix-org/matrix-wysiwyg" "2.37.3"
+    "@matrix-org/olm" "3.2.15"
     "@matrix-org/react-sdk-module-api" "^2.4.0"
     "@matrix-org/spec" "^1.7.0"
     "@sentry/browser" "^8.0.0"
     "@testing-library/react-hooks" "^8.0.1"
     "@vector-im/compound-design-tokens" "^1.2.0"
-    "@vector-im/compound-web" "^5.2.3"
+    "@vector-im/compound-web" "^4.6.0"
     "@zxcvbn-ts/core" "^3.0.4"
     "@zxcvbn-ts/language-common" "^3.0.4"
     "@zxcvbn-ts/language-en" "^3.0.2"
@@ -7998,16 +7999,17 @@ matrix-mock-request@^2.5.0:
     counterpart "^0.18.6"
     diff-dom "^5.0.0"
     diff-match-patch "^1.0.5"
-    emojibase-regex "15.3.2"
+    emojibase-regex "15.3.0"
     escape-html "^1.0.3"
     file-saver "^2.0.5"
-    filesize "10.1.4"
+    filesize "10.1.2"
     github-markdown-css "^5.5.1"
     glob-to-regexp "^0.4.1"
+    graphemer "^1.4.0"
     highlight.js "^11.3.1"
     html-entities "^2.0.0"
     is-ip "^3.1.0"
-    js-xxhash "^4.0.0"
+    js-xxhash "^3.0.1"
     jszip "^3.7.0"
     katex "^0.16.0"
     linkify-element "4.1.3"
@@ -8026,7 +8028,8 @@ matrix-mock-request@^2.5.0:
     opus-recorder "^8.0.3"
     pako "^2.0.3"
     png-chunks-extract "^1.0.0"
-    posthog-js "1.145.0"
+    posthog-js "1.138.1"
+    proposal-temporal "^0.9.0"
     qrcode "1.5.3"
     re-resizable "^6.9.0"
     react "17.0.2"
@@ -8039,7 +8042,6 @@ matrix-mock-request@^2.5.0:
     sanitize-filename "^1.6.3"
     sanitize-html "2.13.0"
     tar-js "^0.3.0"
-    temporal-polyfill "^0.2.5"
     ua-parser-js "^1.0.2"
     uuid "^10.0.0"
     what-input "^5.2.10"
@@ -9418,7 +9420,16 @@ postcss-value-parser@^4.0.0, postcss-value-parser@^4.1.0, postcss-value-parser@^
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz#723c09920836ba6d3e5af019f92bc0971c02e514"
   integrity sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==
 
-postcss@8.4.39, postcss@^8.3.11, postcss@^8.4.33, postcss@^8.4.38, postcss@^8.4.39:
+postcss@8.4.38:
+  version "8.4.38"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.38.tgz#b387d533baf2054288e337066d81c6bee9db9e0e"
+  integrity sha512-Wglpdk03BSfXkHoQa3b/oulrotAkwrlLDRSOb9D0bN86FdRyE9lppSp33aHNPgBa0JKCoB+drFLZkQoRRYae5A==
+  dependencies:
+    nanoid "^3.3.7"
+    picocolors "^1.0.0"
+    source-map-js "^1.2.0"
+
+postcss@^8.3.11, postcss@^8.4.33, postcss@^8.4.38, postcss@^8.4.39:
   version "8.4.39"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.39.tgz#aa3c94998b61d3a9c259efa51db4b392e1bde0e3"
   integrity sha512-0vzE+lAiG7hZl1/9I8yzKLx3aR9Xbof3fBHKunvMfOCYAtMhrsnccJY2iTURb9EZd5+pLuiNV9/c/GZJOHsgIw==