diff --git a/esinstall/package.json b/esinstall/package.json
index 57539633d2..cd559786c7 100644
--- a/esinstall/package.json
+++ b/esinstall/package.json
@@ -54,7 +54,7 @@
     "resolve": "^1.20.0",
     "rimraf": "^3.0.0",
     "rollup": "2.37.1",
-    "rollup-plugin-polyfill-node": "^0.5.0",
+    "rollup-plugin-polyfill-node": "^0.6.2",
     "slash": "^3.0.0",
     "validate-npm-package-name": "^3.0.0",
     "vm2": "^3.9.2"
diff --git a/esinstall/src/index.ts b/esinstall/src/index.ts
index f0d3888e6d..d26c7d9aa7 100644
--- a/esinstall/src/index.ts
+++ b/esinstall/src/index.ts
@@ -93,7 +93,7 @@ function generateReplacements(env: Object): {[key: string]: string} {
     {
       // Other find & replacements:
       // tslib: fights with Rollup's namespace/default handling, so just remove it.
-      'return (mod && mod.__esModule) ? mod : { "default": mod };': 'return mod;',
+      'mod && mod.__esModule': 'true',
     },
   );
 }
diff --git a/snowpack/src/sources/local.ts b/snowpack/src/sources/local.ts
index d1a8234559..055ceea304 100644
--- a/snowpack/src/sources/local.ts
+++ b/snowpack/src/sources/local.ts
@@ -49,6 +49,7 @@ const NEVER_PEER_PACKAGES: string[] = [
   'es-abstract',
   'node-fetch',
   'whatwg-fetch',
+  'tslib',
 ];
 
 function isPackageEsm(packageManifest: any): boolean {
diff --git a/yarn.lock b/yarn.lock
index 9b6b20ee25..052288ff5f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12812,10 +12812,10 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^3.0.0"
     inherits "^2.0.1"
 
-rollup-plugin-polyfill-node@^0.5.0:
-  version "0.5.0"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-polyfill-node/-/rollup-plugin-polyfill-node-0.5.0.tgz#afa87f9105233963b89b0f74a2baaac53ab8a232"
-  integrity sha512-CYPf4vKeZG5w/Ut7TR1lEMKiBT2pHfj1RLnk92whXKFtT8IGkm+TydwgDNpgTXBCI4V528YijyFVMz4dKcR3AA==
+rollup-plugin-polyfill-node@^0.6.2:
+  version "0.6.2"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-polyfill-node/-/rollup-plugin-polyfill-node-0.6.2.tgz#dea62e00f5cc2c174e4b4654b5daab79b1a92fc3"
+  integrity sha512-gMCVuR0zsKq0jdBn8pSXN1Ejsc458k2QsFFvQdbHoM0Pot5hEnck+pBP/FDwFS6uAi77pD3rDTytsaUStsOMlA==
   dependencies:
     "@rollup/plugin-inject" "^4.0.0"