diff --git a/package.json b/package.json
index d4e58c80e4..d24fcd1777 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "is-ip": "^2.0.0",
     "linkifyjs": "^2.1.6",
     "lodash": "^4.17.14",
-    "matrix-js-sdk": "3.0.0",
+    "matrix-js-sdk": "4.0.0-rc.1",
     "pako": "^1.0.5",
     "png-chunks-extract": "^1.0.0",
     "prop-types": "^15.5.8",
diff --git a/yarn.lock b/yarn.lock
index 0177629cd8..808721a188 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5732,10 +5732,10 @@ mathml-tag-names@^2.0.1:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.1.tgz#6dff66c99d55ecf739ca53c492e626f1d12a33cc"
   integrity sha512-pWB896KPGSGkp1XtyzRBftpTzwSOL0Gfk0wLvxt4f2mgzjY19o0LxJ3U25vNWTzsh7da+KTbuXQoQ3lOJZ8WHw==
 
-matrix-js-sdk@3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-3.0.0.tgz#97908f9eda9eeb3ba0333b7e474c45f2b258e50c"
-  integrity sha512-lzUMwJAZHw7Dk0K+rubqe6kEpy4+pJ+qCp8n6lisfdKfMDJXdNCkjiiXRnakM1ZD4PFYK8ju89+NfxlyhAAd4A==
+matrix-js-sdk@4.0.0-rc.1:
+  version "4.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-4.0.0-rc.1.tgz#160d445364aa8ff36ae4fffb0ebc944f680afa4e"
+  integrity sha512-1tP9fUCU5I4bXQQHuVlKHbpySh71aM6sugVC6L8ikG1ebZuKkAc2tXf1tiHizp3hZadHoTZ1PGH19ZFlKDZ8Qw==
   dependencies:
     another-json "^0.2.0"
     browser-request "^0.3.3"