diff --git a/go.mod b/go.mod
index 0a4cb588c..efee724bd 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	charm.land/glamour/v2 v2.0.1
 	charm.land/lipgloss/v2 v2.0.6
 	github.com/basecamp/actioncable-client/go/v2 v2.0.2
-	github.com/basecamp/hey-sdk/go v0.32.1
+	github.com/basecamp/hey-sdk/go v0.33.1
 	github.com/basecamp/mcp v0.0.0-20260828100356-2d6f44b51e9d
 	github.com/charmbracelet/x/ansi v0.11.9
 	github.com/fsnotify/fsnotify v1.10.1
diff --git a/go.sum b/go.sum
index eaa9e4119..1f1422430 100644
--- a/go.sum
+++ b/go.sum
@@ -89,8 +89,8 @@ github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuP
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
 github.com/basecamp/actioncable-client/go/v2 v2.0.2 h1:h2Sl15gj2lI/EX5E0EUxjyYgf0LF9Gn1zqEUInSrUpc=
 github.com/basecamp/actioncable-client/go/v2 v2.0.2/go.mod h1:3Y0N9V5LXclT5nQWcPhq/+6rj4eKXgKAX8dx15X8yB8=
-github.com/basecamp/hey-sdk/go v0.32.1 h1:OBLfjkGkim2F220FCfc91EdjSpScw53edScCWqd/NnY=
-github.com/basecamp/hey-sdk/go v0.32.1/go.mod h1:eCJOhTLOpi2FCQUXireHZQ7DzRs2TUqvYhRDTfVLoDY=
+github.com/basecamp/hey-sdk/go v0.33.1 h1:iMao0I8u6Q5ozkpm0dp7L9ge2BJY7vRMVJuFZxTo7RY=
+github.com/basecamp/hey-sdk/go v0.33.1/go.mod h1:/idi1NgEn1l5AtKM7PwpfnvZgKwx/Hw3xz2k5Pc6woA=
 github.com/basecamp/mcp v0.0.0-20260828100356-2d6f44b51e9d h1:zEQVGq1x1nhKMZ2TudFAcSJ32CHT8richI1vQakIKz4=
 github.com/basecamp/mcp v0.0.0-20260828100356-2d6f44b51e9d/go.mod h1:Ee2c/q1/pg+5T5741PIuA3s6VJMQC7I0XBNXIHIujzA=
 github.com/blang/semver v3.5.1+incompatible h1:cQNTCjp13qL8KC3Nbxr/y2Bqb63oX6wdnnjpJbkM4JQ=
diff --git a/internal/mcpserver/model/PROVENANCE.json b/internal/mcpserver/model/PROVENANCE.json
index d0ff0ab12..c7e26e8e3 100644
--- a/internal/mcpserver/model/PROVENANCE.json
+++ b/internal/mcpserver/model/PROVENANCE.json
@@ -1,7 +1,7 @@
 {
   "source": "github.com/basecamp/hey-sdk",
-  "commit": "e04513e85e555ecbf1db452f3a7bf6b61769eb63",
-  "ref": "go/v0.32.1",
+  "commit": "ed0becfa7c7d07d8814ba5998771dffed201de85",
+  "ref": "go/v0.33.1",
   "files": ["behavior-model.json", "openapi.json"],
   "synced_by": "scripts/sync-mcp-model.sh"
 }
diff --git a/internal/mcpserver/model/openapi.json b/internal/mcpserver/model/openapi.json
index a87f7a645..7d957671b 100644
--- a/internal/mcpserver/model/openapi.json
+++ b/internal/mcpserver/model/openapi.json
@@ -14434,7 +14434,8 @@
             "description": "Discriminator with direct (`CalendarTodo`) and namespaced (`Calendar::Todo`) values."
           },
           "parent": {
-            "$ref": "#/components/schemas/Recording"
+            "$ref": "#/components/schemas/Recording",
+            "x-go-type-skip-optional-pointer": false
           },
           "starts_at_time_zone": {
             "type": "string"
diff --git a/nix/package.nix b/nix/package.nix
index 9b654204a..6fcc91889 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -18,7 +18,7 @@ buildGoModule.override { inherit go; } (finalAttrs: {
 
   # To update: run `make update-nix-hash` (Docker). It rewrites this quoted
   # value in place, so keep it a string literal rather than lib.fakeHash.
-  vendorHash = "sha256-OqGvfQNawKocBuiUS3vy2KIRdtId479lE429E712+WU=";
+  vendorHash = "sha256-eU2YUbyuOLwZ/owju0HcziWNFM1xG1DqnjpfCqkT85k=";
 
   subPackages = [ "cmd/hey" ];