diff --git a/cypress.config.ts b/cypress.config.ts
index c3403838e6..50d4106ad6 100644
--- a/cypress.config.ts
+++ b/cypress.config.ts
@@ -31,7 +31,7 @@ export default defineConfig({
     },
     env: {
         // Docker tag to use for `ghcr.io/matrix-org/sliding-sync` image.
-        SLIDING_SYNC_PROXY_TAG: "v0.99.0-rc1",
+        SLIDING_SYNC_PROXY_TAG: "v0.99.3",
         HOMESERVER: "synapse",
     },
     retries: {