diff --git a/README.md b/README.md
index 22c9efb9..dc739389 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 ## Intro
 
 This monorepo is part of [ChainSafe's Lodestar](https://lodestar.chainsafe.io) project.
-It contains packages related to [Simple Serialize](https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md).
+It contains packages related to [Simple Serialize](https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md).
 
 ## Packages
 
diff --git a/packages/persistent-merkle-tree/src/proof/index.ts b/packages/persistent-merkle-tree/src/proof/index.ts
index d83f526c..6abc53cb 100644
--- a/packages/persistent-merkle-tree/src/proof/index.ts
+++ b/packages/persistent-merkle-tree/src/proof/index.ts
@@ -54,7 +54,7 @@ export interface TreeOffsetProof {
 /**
  * A proof for multiple leaves in a tree.
  *
- * See https://github.com/ethereum/consensus-specs/blob/dev/ssz/merkle-proofs.md#merkle-multiproofs
+ * See https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/merkle-proofs.md#merkle-multiproofs
  */
 export interface MultiProof {
   type: ProofType.multi;
diff --git a/packages/persistent-merkle-tree/src/proof/multi.ts b/packages/persistent-merkle-tree/src/proof/multi.ts
index f9966b5f..da13d147 100644
--- a/packages/persistent-merkle-tree/src/proof/multi.ts
+++ b/packages/persistent-merkle-tree/src/proof/multi.ts
@@ -6,7 +6,7 @@ import {SortOrder, computeMultiProofBitstrings} from "./util.ts";
 /**
  * Create an multiproof
  *
- * See https://github.com/ethereum/consensus-specs/blob/dev/ssz/merkle-proofs.md#merkle-multiproofs
+ * See https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/merkle-proofs.md#merkle-multiproofs
  *
  * @param rootNode the root node of the tree
  * @param gindices generalized indices of leaves to include in the proof
@@ -28,7 +28,7 @@ export function createMultiProof(rootNode: Node, gindices: Gindex[]): [Uint8Arra
 /**
  * Recreate a `Node` given a multiproof
  *
- * See https://github.com/ethereum/consensus-specs/blob/dev/ssz/merkle-proofs.md#merkle-multiproofs
+ * See https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/merkle-proofs.md#merkle-multiproofs
  *
  * @param leaves leaves of a EF multiproof
  * @param witnesses witnesses of a EF multiproof
diff --git a/packages/ssz/README.md b/packages/ssz/README.md
index 62ecd7b2..61be5da2 100644
--- a/packages/ssz/README.md
+++ b/packages/ssz/README.md
@@ -5,7 +5,7 @@
 
 ## Summary
 
-[Simple Serialize (SSZ)](https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md) is a consensus layer standard that defines how consensus objects are serialized and merkleized.
+[Simple Serialize (SSZ)](https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md) is a consensus layer standard that defines how consensus objects are serialized and merkleized.
 
 SSZ is a type system that defines:
 
diff --git a/packages/ssz/src/type/abstract.ts b/packages/ssz/src/type/abstract.ts
index 39e7971b..df5a304a 100644
--- a/packages/ssz/src/type/abstract.ts
+++ b/packages/ssz/src/type/abstract.ts
@@ -132,7 +132,7 @@ export abstract class Type<V> {
    * Merkleize value and compute its hashTreeRoot.
    *
    * See spec for definition of hashTreeRoot:
-   * https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#merkleization
+   * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md#merkleization
    */
   abstract hashTreeRoot(value: V): Uint8Array;
 
diff --git a/packages/ssz/src/type/basic.ts b/packages/ssz/src/type/basic.ts
index b7ddb9cc..f1b89512 100644
--- a/packages/ssz/src/type/basic.ts
+++ b/packages/ssz/src/type/basic.ts
@@ -3,7 +3,7 @@ import {Type} from "./abstract.ts";
 
 /**
  * Represents a basic type as defined in the spec:
- * https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#basic-types
+ * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md#basic-types
  */
 export abstract class BasicType<V> extends Type<V> {
   readonly isBasic = true;
diff --git a/packages/ssz/src/type/composite.ts b/packages/ssz/src/type/composite.ts
index ab2d1fb8..0de0d129 100644
--- a/packages/ssz/src/type/composite.ts
+++ b/packages/ssz/src/type/composite.ts
@@ -42,7 +42,7 @@ export type CompositeTypeAny = CompositeType<unknown, unknown, unknown>;
 
 /**
  * Represents a composite type as defined in the spec:
- * https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#composite-types
+ * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md#composite-types
  */
 export abstract class CompositeType<V, TV, TVDU> extends Type<V> {
   readonly isBasic = false;
diff --git a/packages/ssz/src/view/abstract.ts b/packages/ssz/src/view/abstract.ts
index b34c58cb..acafbf48 100644
--- a/packages/ssz/src/view/abstract.ts
+++ b/packages/ssz/src/view/abstract.ts
@@ -31,7 +31,7 @@ export abstract class TreeView<T extends CompositeType<unknown, unknown, unknown
    * Merkleize view and compute its hashTreeRoot.
    *
    * See spec for definition of hashTreeRoot:
-   * https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#merkleization
+   * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md#merkleization
    */
   hashTreeRoot(): Uint8Array {
     return this.node.root;
@@ -49,7 +49,7 @@ export abstract class TreeView<T extends CompositeType<unknown, unknown, unknown
    * ```
    *
    * See spec for definition of merkle multiproofs:
-   * https://github.com/ethereum/consensus-specs/blob/dev/ssz/merkle-proofs.md#merkle-multiproofs
+   * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/merkle-proofs.md#merkle-multiproofs
    */
   createProof(paths: JsonPath[]): Proof {
     return this.type.tree_createProof(this.node, paths);
diff --git a/packages/ssz/src/viewDU/abstract.ts b/packages/ssz/src/viewDU/abstract.ts
index a7b4ee26..a74adfb7 100644
--- a/packages/ssz/src/viewDU/abstract.ts
+++ b/packages/ssz/src/viewDU/abstract.ts
@@ -57,7 +57,7 @@ export abstract class TreeViewDU<T extends CompositeType<unknown, unknown, unkno
    * Commits any pending changes before computing the root.
    *
    * See spec for definition of hashTreeRoot:
-   * https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#merkleization
+   * https://github.com/ethereum/consensus-specs/blob/v1.6.1/ssz/simple-serialize.md#merkleization
    */
   hashTreeRoot(): Uint8Array {
     this.commit();