diff --git a/lib/Commands.ml b/lib/Commands.ml
index 8d54dd5..880e2fb 100644
--- a/lib/Commands.ml
+++ b/lib/Commands.ml
@@ -37656,11 +37656,20 @@ The default is true. |desc}]
             [@key "generateCmtgKeyOnNextOperation"]
             [@yojson.option]
             [@ocaml.doc "No description provided"]
+        signCount : Types.number option;
+            [@key "signCount"]
+            [@yojson.option]
+            [@ocaml.doc
+              "Must be equal to or greater than -1.\n\
+               If -1, the signature counter is removed from the credential, \
+               and every\n\
+               assertion operation will report a value of 0.\n\
+               See https://w3c.github.io/webauthn/#signature-counter"]
       }
       [@@deriving yojson]
 
       let make ~authenticatorId ~credentialId ?backupEligibility ?backupState
-          ?activeCmtgKeyIndex ?generateCmtgKeyOnNextOperation () =
+          ?activeCmtgKeyIndex ?generateCmtgKeyOnNextOperation ?signCount () =
         {
           authenticatorId;
           credentialId;
@@ -37668,6 +37677,7 @@ The default is true. |desc}]
           backupState;
           activeCmtgKeyIndex;
           generateCmtgKeyOnNextOperation;
+          signCount;
         }
     end
 
diff --git a/lib/Types.ml b/lib/Types.ml
index a7389a9..0780006 100644
--- a/lib/Types.ml
+++ b/lib/Types.ml
@@ -39513,11 +39513,14 @@ and WebAuthn : sig
             "An opaque byte sequence with a maximum size of 64 bytes mapping the\n\
              credential to a specific user. (Encoded as a base64 string when \
              passed over JSON)"]
-      signCount : number;
+      signCount : number option;
           [@key "signCount"]
+          [@yojson.option]
           [@ocaml.doc
-            "Signature counter. This is incremented by one for each successful\n\
-             assertion.\n\
+            "Signature counter. Must be equal to or greater than -1.\n\
+             If -1, the credential won't have an associated signature counter, \
+             and\n\
+             every assertion operation will report a value of 0.\n\
              See https://w3c.github.io/webauthn/#signature-counter"]
       largeBlob : string option;
           [@key "largeBlob"]
@@ -39904,11 +39907,14 @@ end = struct
             "An opaque byte sequence with a maximum size of 64 bytes mapping the\n\
              credential to a specific user. (Encoded as a base64 string when \
              passed over JSON)"]
-      signCount : number;
+      signCount : number option;
           [@key "signCount"]
+          [@yojson.option]
           [@ocaml.doc
-            "Signature counter. This is incremented by one for each successful\n\
-             assertion.\n\
+            "Signature counter. Must be equal to or greater than -1.\n\
+             If -1, the credential won't have an associated signature counter, \
+             and\n\
+             every assertion operation will report a value of 0.\n\
              See https://w3c.github.io/webauthn/#signature-counter"]
       largeBlob : string option;
           [@key "largeBlob"]
@@ -39988,11 +39994,14 @@ end = struct
             "An opaque byte sequence with a maximum size of 64 bytes mapping the\n\
              credential to a specific user. (Encoded as a base64 string when \
              passed over JSON)"]
-      signCount : number;
+      signCount : number option;
           [@key "signCount"]
+          [@yojson.option]
           [@ocaml.doc
-            "Signature counter. This is incremented by one for each successful\n\
-             assertion.\n\
+            "Signature counter. Must be equal to or greater than -1.\n\
+             If -1, the credential won't have an associated signature counter, \
+             and\n\
+             every assertion operation will report a value of 0.\n\
              See https://w3c.github.io/webauthn/#signature-counter"]
       largeBlob : string option;
           [@key "largeBlob"]
diff --git a/package.json b/package.json
index 0cb9288..b9ecc44 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cdp",
-  "version": "0.0.1666840",
+  "version": "0.0.1669207",
   "description": "Chrome Devtools Protocol Types for OCaml",
   "license": "MIT",
   "repository": {