diff --git a/packages/block/package.json b/packages/block/package.json
index a6453bd62d..4591a64184 100644
--- a/packages/block/package.json
+++ b/packages/block/package.json
@@ -17,6 +17,7 @@
   "license": "MPL-2.0",
   "author": "mjbecze (mb@ethdev.com)",
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/blockchain/package.json b/packages/blockchain/package.json
index 8f8ad12d1f..1ea6f94b08 100644
--- a/packages/blockchain/package.json
+++ b/packages/blockchain/package.json
@@ -17,6 +17,7 @@
   "license": "MPL-2.0",
   "author": "mjbecze <mjbecze@gmail.com>",
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/common/package.json b/packages/common/package.json
index 41083bf401..73af2edef5 100644
--- a/packages/common/package.json
+++ b/packages/common/package.json
@@ -27,6 +27,7 @@
     }
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/devp2p/package.json b/packages/devp2p/package.json
index b8379fd045..a20a1e5591 100644
--- a/packages/devp2p/package.json
+++ b/packages/devp2p/package.json
@@ -30,6 +30,7 @@
     "Holger Drewes <holger.drewes@gmail.com>"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/ethash/package.json b/packages/ethash/package.json
index c3eb89c7fc..df473dcc59 100644
--- a/packages/ethash/package.json
+++ b/packages/ethash/package.json
@@ -18,6 +18,7 @@
   "license": "MPL-2.0",
   "author": "mjbecze <mjbecze@gmail.com>",
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/evm/package.json b/packages/evm/package.json
index 1afd35ffc9..bdd1015585 100644
--- a/packages/evm/package.json
+++ b/packages/evm/package.json
@@ -22,6 +22,7 @@
     "Alex Beregszaszi <alex@rtfs.hu>"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/genesis/package.json b/packages/genesis/package.json
index bcfb77a111..804470346b 100644
--- a/packages/genesis/package.json
+++ b/packages/genesis/package.json
@@ -17,6 +17,7 @@
   "license": "MIT",
   "author": "g11tech <gajinder@g11.in>",
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/rlp/package.json b/packages/rlp/package.json
index d3951d43fd..adc19455c9 100644
--- a/packages/rlp/package.json
+++ b/packages/rlp/package.json
@@ -25,6 +25,7 @@
     "Paul Miller <pkg@paulmillr.com>"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/statemanager/package.json b/packages/statemanager/package.json
index b34d670fe4..051d8e8239 100644
--- a/packages/statemanager/package.json
+++ b/packages/statemanager/package.json
@@ -20,6 +20,7 @@
     "g11tech <gajinder@g11.in>"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/trie/package.json b/packages/trie/package.json
index d9f7c58cea..17251fd4de 100644
--- a/packages/trie/package.json
+++ b/packages/trie/package.json
@@ -22,6 +22,7 @@
     "Aaron Kumavis <http://aaron.kumavis.me/> (https://github.com/kumavis)"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/tx/package.json b/packages/tx/package.json
index 014e7019ea..2ca85c6749 100644
--- a/packages/tx/package.json
+++ b/packages/tx/package.json
@@ -28,6 +28,7 @@
     }
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/util/package.json b/packages/util/package.json
index 2be8921aaa..785eb9a4d7 100644
--- a/packages/util/package.json
+++ b/packages/util/package.json
@@ -62,6 +62,7 @@
     }
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/verkle/package.json b/packages/verkle/package.json
index 1cc3b7ab1f..e97a1a9baf 100644
--- a/packages/verkle/package.json
+++ b/packages/verkle/package.json
@@ -25,6 +25,7 @@
     }
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/vm/package.json b/packages/vm/package.json
index 94f2e3a3c9..4179f435db 100644
--- a/packages/vm/package.json
+++ b/packages/vm/package.json
@@ -20,6 +20,7 @@
     "Alex Beregszaszi <alex@rtfs.hu>"
   ],
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {
diff --git a/packages/wallet/package.json b/packages/wallet/package.json
index 536ed2e27b..ee4a11d329 100644
--- a/packages/wallet/package.json
+++ b/packages/wallet/package.json
@@ -18,6 +18,7 @@
   "license": "MIT",
   "author": "Alex Beregszaszi <alex@rtfs.hu>",
   "type": "module",
+  "sideEffects": false,
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
   "exports": {