diff --git a/packages/api/package.json b/packages/api/package.json
index 950addf489d1..36965cafb57d 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -43,7 +43,7 @@
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
     "@chainsafe/persistent-merkle-tree": "^0.3.3",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "cross-fetch": "^3.1.4",
     "eventsource": "^1.1.0",
     "qs": "^6.10.1"
diff --git a/packages/beacon-state-transition/package.json b/packages/beacon-state-transition/package.json
index 4fc3ff155dd6..4441eac968c5 100644
--- a/packages/beacon-state-transition/package.json
+++ b/packages/beacon-state-transition/package.json
@@ -44,7 +44,7 @@
     "@chainsafe/lodestar-utils": "^0.27.0",
     "@chainsafe/persistent-merkle-tree": "^0.3.3",
     "@chainsafe/persistent-ts": "^0.19.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "bigint-buffer": "^1.1.5",
     "buffer-xor": "^2.0.2"
   },
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 28842593e476..dd1fc9234c55 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -65,7 +65,7 @@
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
     "@chainsafe/lodestar-validator": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "@types/lockfile": "^1.0.1",
     "bip39": "^3.0.2",
     "deepmerge": "^3.2.0",
diff --git a/packages/config/package.json b/packages/config/package.json
index ce334bd9b69c..07a7c6fb60e3 100644
--- a/packages/config/package.json
+++ b/packages/config/package.json
@@ -46,6 +46,6 @@
   "dependencies": {
     "@chainsafe/lodestar-params": "^0.27.0",
     "@chainsafe/lodestar-types": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11"
+    "@chainsafe/ssz": "^0.8.12"
   }
 }
diff --git a/packages/db/package.json b/packages/db/package.json
index 22b84704bc08..9e2e3abc7ee0 100644
--- a/packages/db/package.json
+++ b/packages/db/package.json
@@ -40,7 +40,7 @@
   "dependencies": {
     "@chainsafe/lodestar-config": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "it-all": "^1.0.2",
     "level": "^6.0.1",
     "levelup": "^4.4.0"
diff --git a/packages/fork-choice/package.json b/packages/fork-choice/package.json
index aaea05392696..456b6d8f4c06 100644
--- a/packages/fork-choice/package.json
+++ b/packages/fork-choice/package.json
@@ -44,7 +44,7 @@
     "@chainsafe/lodestar-params": "^0.27.0",
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11"
+    "@chainsafe/ssz": "^0.8.12"
   },
   "keywords": [
     "ethereum",
diff --git a/packages/light-client/package.json b/packages/light-client/package.json
index 9dd4e196bb1f..15cacce6022b 100644
--- a/packages/light-client/package.json
+++ b/packages/light-client/package.json
@@ -46,7 +46,7 @@
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
     "@chainsafe/persistent-merkle-tree": "^0.3.3",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "cross-fetch": "^3.1.4",
     "mitt": "^2.1.0"
   },
diff --git a/packages/lodestar/package.json b/packages/lodestar/package.json
index dbaf046d5e4f..bcc22972dcbb 100644
--- a/packages/lodestar/package.json
+++ b/packages/lodestar/package.json
@@ -59,7 +59,7 @@
     "@chainsafe/lodestar-validator": "^0.27.0",
     "@chainsafe/persistent-merkle-tree": "^0.3.3",
     "@chainsafe/snappy-stream": "5.0.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "@ethersproject/abi": "^5.0.0",
     "@types/datastore-level": "^1.1.1",
     "bl": "^4.0.2",
diff --git a/packages/params/package.json b/packages/params/package.json
index 35f0800f18b5..392d08aeaef5 100644
--- a/packages/params/package.json
+++ b/packages/params/package.json
@@ -45,7 +45,7 @@
     "blockchain"
   ],
   "dependencies": {
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "js-yaml": "^3.13.1"
   },
   "devDependencies": {
diff --git a/packages/spec-test-runner/package.json b/packages/spec-test-runner/package.json
index 47024b505f68..4929b7955194 100644
--- a/packages/spec-test-runner/package.json
+++ b/packages/spec-test-runner/package.json
@@ -48,7 +48,7 @@
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
     "@chainsafe/lodestar-validator": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "@types/yargs": "^13.0.2"
   },
   "keywords": [
diff --git a/packages/spec-test-util/package.json b/packages/spec-test-util/package.json
index 03893235a4c7..069131d5b1e7 100644
--- a/packages/spec-test-util/package.json
+++ b/packages/spec-test-util/package.json
@@ -48,7 +48,7 @@
   ],
   "dependencies": {
     "@chainsafe/lodestar-utils": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "axios": "^0.21.0",
     "chai": "^4.2.0",
     "mocha": "^8.1.1",
diff --git a/packages/types/package.json b/packages/types/package.json
index 571c6775fa66..c00113fee727 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -38,7 +38,7 @@
   "types": "lib/index.d.ts",
   "dependencies": {
     "@chainsafe/lodestar-params": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11"
+    "@chainsafe/ssz": "^0.8.12"
   },
   "keywords": [
     "ethereum",
diff --git a/packages/utils/package.json b/packages/utils/package.json
index f992ac988f40..5894ac8918b8 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -39,7 +39,7 @@
   "types": "lib/index.d.ts",
   "dependencies": {
     "@chainsafe/abort-controller": "^3.0.1",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "any-signal": "2.1.1",
     "bigint-buffer": "^1.1.5",
     "chalk": "^2.4.2",
diff --git a/packages/validator/package.json b/packages/validator/package.json
index c53f5bae9633..35487067cbe7 100644
--- a/packages/validator/package.json
+++ b/packages/validator/package.json
@@ -56,7 +56,7 @@
     "@chainsafe/lodestar-params": "^0.27.0",
     "@chainsafe/lodestar-types": "^0.27.0",
     "@chainsafe/lodestar-utils": "^0.27.0",
-    "@chainsafe/ssz": "^0.8.11",
+    "@chainsafe/ssz": "^0.8.12",
     "bigint-buffer": "^1.1.5"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index ef3661f70cff..e40aaed81d4f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1365,10 +1365,10 @@
     buffer-from "^1.1.1"
     snappy "^6.3.5"
 
-"@chainsafe/ssz@^0.8.11":
-  version "0.8.11"
-  resolved "https://registry.yarnpkg.com/@chainsafe/ssz/-/ssz-0.8.11.tgz#adbddcc7ace83a3c43f0d46d7401fa8cc7430f8e"
-  integrity sha512-d1P3i9Wook/wBMJlTCOJ0bfzaiQiW7JZfBT06IJPI36KgcYSxRiNuNwH6QiJBS3HESvcb86nQNZSHex2OB8stw==
+"@chainsafe/ssz@^0.8.12":
+  version "0.8.12"
+  resolved "https://registry.yarnpkg.com/@chainsafe/ssz/-/ssz-0.8.12.tgz#6d381952b5b6360a2a7ebf7c438a5922ed2cb830"
+  integrity sha512-tktiu0w2hiHBXQJ5Qei+I2cVWyrIlqZ8xc3aDpjtHAZIHaqPts9TghB8gM2ff2ll9xKEVzXtVy2BWPyyRI/70A==
   dependencies:
     "@chainsafe/as-sha256" "^0.2.2"
     "@chainsafe/persistent-merkle-tree" "^0.3.3"