diff --git a/packages/api/package.json b/packages/api/package.json
index ac95cab24ad6..3c06542971f9 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -67,7 +67,7 @@
     "@chainsafe/persistent-merkle-tree": "^0.4.1",
     "@chainsafe/ssz": "^0.9.1",
     "cross-fetch": "^3.1.4",
-    "eventsource": "^1.1.0",
+    "eventsource": "^2.0.2",
     "qs": "^6.10.1"
   },
   "devDependencies": {
diff --git a/packages/lodestar/package.json b/packages/lodestar/package.json
index 0268ff8c8c6a..0308dc514a78 100644
--- a/packages/lodestar/package.json
+++ b/packages/lodestar/package.json
@@ -126,7 +126,7 @@
     "@types/supertest": "^2.0.8",
     "@types/tmp": "^0.2.0",
     "@types/varint": "^6.0.0",
-    "eventsource": "^1.1.0",
+    "eventsource": "^2.0.2",
     "rewiremock": "^3.14.3",
     "rimraf": "^3.0.2",
     "tmp": "^0.2.1"
diff --git a/yarn.lock b/yarn.lock
index 11b111b21e3a..bf484e9b7491 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5137,12 +5137,10 @@ events@^3.3.0:
   resolved "https://registry.yarnpkg.com/events/-/events-3.3.0.tgz#31a95ad0a924e2d2c419a813aeb2c4e878ea7400"
   integrity sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q==
 
-eventsource@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/eventsource/-/eventsource-1.1.0.tgz#00e8ca7c92109e94b0ddf32dac677d841028cfaf"
-  integrity sha512-VSJjT5oCNrFvCS6igjzPAt5hBzQ2qPBFIbJ03zLI9SE0mxwZpMw6BfJrbFHm1a141AavMEB8JHmBhWAd66PfCg==
-  dependencies:
-    original "^1.0.0"
+eventsource@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/eventsource/-/eventsource-2.0.2.tgz#76dfcc02930fb2ff339520b6d290da573a9e8508"
+  integrity sha512-IzUmBGPR3+oUG9dUeXynyNmf91/3zUSJg1lCktzKw47OXuhco54U3r9B7O4XX+Rb1Itm9OZ2b0RkTs10bICOxA==
 
 evp_bytestokey@^1.0.0, evp_bytestokey@^1.0.3:
   version "1.0.3"
@@ -8779,13 +8777,6 @@ ora@^5.4.1:
     strip-ansi "^6.0.0"
     wcwidth "^1.0.1"
 
-original@^1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/original/-/original-1.0.2.tgz#e442a61cffe1c5fd20a65f3261c26663b303f25f"
-  integrity sha512-hyBVl6iqqUOJ8FqRe+l/gS8H+kKYjrEndd5Pm1MfBtsEKA038HkkdbAl/72EAXGyonD/PFsvmVG+EvcIpliMBg==
-  dependencies:
-    url-parse "^1.4.3"
-
 os-browserify@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/os-browserify/-/os-browserify-0.3.0.tgz#854373c7f5c2315914fc9bfc6bd8238fdda1ec27"
@@ -9538,11 +9529,6 @@ querystring@0.2.0:
   resolved "https://registry.yarnpkg.com/querystring/-/querystring-0.2.0.tgz#b209849203bb25df820da756e747005878521620"
   integrity sha1-sgmEkgO7Jd+CDadW50cAWHhSFiA=
 
-querystringify@^2.1.1:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.2.0.tgz#3345941b4153cb9d082d8eee4cda2016a9aef7f6"
-  integrity sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==
-
 queue-microtask@^1.1.2, queue-microtask@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/queue-microtask/-/queue-microtask-1.2.3.tgz#4929228bbc724dfac43e0efb058caf7b6cfb6243"
@@ -9838,11 +9824,6 @@ require-main-filename@^2.0.0:
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-2.0.0.tgz#d0b329ecc7cc0f61649f62215be69af54aa8989b"
   integrity sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==
 
-requires-port@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/requires-port/-/requires-port-1.0.0.tgz#925d2601d39ac485e091cf0da5c6e694dc3dcaff"
-  integrity sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=
-
 resolve-alpn@^1.0.0:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/resolve-alpn/-/resolve-alpn-1.1.2.tgz#30b60cfbb0c0b8dc897940fe13fe255afcdd4d28"
@@ -11275,14 +11256,6 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-url-parse@^1.4.3:
-  version "1.5.3"
-  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.5.3.tgz#71c1303d38fb6639ade183c2992c8cc0686df862"
-  integrity sha512-IIORyIQD9rvj0A4CLWsHkBBJuNqWpFQe224b6j9t/ABmquIS0qDU2pY6kl6AuOrL5OkCXHMCFNe1jBcuAggjvQ==
-  dependencies:
-    querystringify "^2.1.1"
-    requires-port "^1.0.0"
-
 url@0.10.3:
   version "0.10.3"
   resolved "https://registry.yarnpkg.com/url/-/url-0.10.3.tgz#021e4d9c7705f21bbf37d03ceb58767402774c64"