diff --git a/package.json b/package.json
index 6380eabd9e..31fb2ea83d 100644
--- a/package.json
+++ b/package.json
@@ -80,7 +80,7 @@
     "is-ip": "^2.0.0",
     "linkifyjs": "^2.1.6",
     "lodash": "^4.17.14",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+    "matrix-js-sdk": "5.1.1-rc.1",
     "minimist": "^1.2.0",
     "pako": "^1.0.5",
     "png-chunks-extract": "^1.0.0",
diff --git a/yarn.lock b/yarn.lock
index 20580f26f9..965e156e39 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5653,9 +5653,10 @@ mathml-tag-names@^2.0.1:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.3.tgz#4ddadd67308e780cf16a47685878ee27b736a0a3"
   integrity sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==
 
-"matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
-  version "5.1.0"
-  resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/bc53f8fdec7222b6ca44a63cafbc7ae8c4cc396f"
+matrix-js-sdk@5.1.1-rc.1:
+  version "5.1.1-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-5.1.1-rc.1.tgz#e3872696b8e6ec3fcae2d1ba1491e6a08d20954a"
+  integrity sha512-55F4jvJSVYJb5DDmso6Mld3HJ9v1UW0eT///SMcJtHVIJd5ZSLvsGV7rvMny7w6MHy5enfH4E2yItjjvlAL9dA==
   dependencies:
     "@babel/runtime" "^7.8.3"
     another-json "^0.2.0"