diff --git a/apps/web/jest.config.ts b/apps/web/jest.config.ts
index b01778758a1..31d08dc36e9 100644
--- a/apps/web/jest.config.ts
+++ b/apps/web/jest.config.ts
@@ -48,7 +48,7 @@ const config: Config = {
         "@vector-im/compound-web": "<rootDir>/node_modules/@vector-im/compound-web",
     },
     transformIgnorePatterns: [
-        `${path.join(__dirname, "../..")}/node_modules/.pnpm/(?!(mime|uuid|p-retry|is-network-error|react-merge-refs|is-ip|ip-regex|super-regex|function-timeout|time-span|convert-hrtime|clone-regexp|is-regexp|matrix-web-i18n|await-lock|@element-hq/web-shared-components|react-virtuoso|lodash|domutils|domhandler|domelementtype|dom-serializer|entities)).+$`,
+        `${path.join(__dirname, "../..")}/node_modules/.pnpm/(?!(mime|uuid|p-retry|is-network-error|react-merge-refs|is-ip|ip-regex|super-regex|function-timeout|time-span|convert-hrtime|clone-regexp|is-regexp|matrix-web-i18n|await-lock|@element-hq/web-shared-components|react-virtuoso|lodash|domutils|domhandler|domelementtype|dom-serializer|entities|matrix-js-sdk)).+$`,
     ],
     collectCoverageFrom: [
         "<rootDir>/src/**/*.{js,ts,tsx}",
diff --git a/apps/web/package.json b/apps/web/package.json
index ac2b693d27a..3d9da89dbeb 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -84,7 +84,7 @@
         "lodash": "npm:lodash-es@4.18.1",
         "maplibre-gl": "^5.0.0",
         "matrix-encrypt-attachment": "^1.0.3",
-        "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+        "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#33e4db98814edb1e100ac8b9721cf84de998f429",
         "matrix-widget-api": "^1.16.1",
         "memoize-one": "^6.0.0",
         "mime": "^4.0.4",
diff --git a/docs/generated/[id].paths.ts b/docs/generated/[id].paths.ts
index 58531ec8bd5..9819edd5a1d 100644
--- a/docs/generated/[id].paths.ts
+++ b/docs/generated/[id].paths.ts
@@ -11,7 +11,7 @@ export default {
         return [
             {
                 params: { id: "automations" },
-                content: await genWorkflowMermaid([root, join(root, "node_modules", "matrix-js-sdk")]),
+                content: await genWorkflowMermaid([root]),
             },
         ];
     },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a50e46ec97e..3dfd4fc5b7b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -650,7 +650,7 @@ importers:
         specifier: ^1.0.3
         version: 1.0.3
       matrix-js-sdk:
-        specifier: github:matrix-org/matrix-js-sdk#develop
+        specifier: github:matrix-org/matrix-js-sdk#33e4db98814edb1e100ac8b9721cf84de998f429
         version: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/33e4db98814edb1e100ac8b9721cf84de998f429
       matrix-widget-api:
         specifier: ^1.17.0
diff --git a/scripts/layered.sh b/scripts/layered.sh
index 912ef56a32a..50027aa4709 100755
--- a/scripts/layered.sh
+++ b/scripts/layered.sh
@@ -36,5 +36,9 @@ if [ "$js_sdk_dep" = "github:matrix-org/matrix-js-sdk#develop" ]; then
     pnpm -C apps/web link ./matrix-js-sdk
     pnpm link ./matrix-js-sdk
 else
+    if [ -n "$JS_SDK_GITHUB_BASE_REF" ]; then
+        echo "ERROR: JS_SDK_GITHUB_BASE_REF ($JS_SDK_GITHUB_BASE_REF) was requested, but package.json pins matrix-js-sdk to $js_sdk_dep, so it would be ignored." >&2
+        exit 1
+    fi
     echo "Skipping matrix-js-sdk fetch and link as package.json pins $js_sdk_dep"
 fi