diff --git a/crates/ty_python_semantic/resources/mdtest/snapshots/typed_dict.md_-_`TypedDict`_-_Diagnostics_(e5289abf5c570c29).snap b/crates/ty_python_semantic/resources/mdtest/snapshots/typed_dict.md_-_`TypedDict`_-_Diagnostics_(e5289abf5c570c29).snap
index 42dfc0e33d..222a3c52f5 100644
--- a/crates/ty_python_semantic/resources/mdtest/snapshots/typed_dict.md_-_`TypedDict`_-_Diagnostics_(e5289abf5c570c29).snap
+++ b/crates/ty_python_semantic/resources/mdtest/snapshots/typed_dict.md_-_`TypedDict`_-_Diagnostics_(e5289abf5c570c29).snap
@@ -142,7 +142,7 @@ info: rule `invalid-key` is enabled by default
 ```
 
 ```
-error[invalid-assignment]: Can not assign to key "id" on TypedDict `Employee`
+error[invalid-assignment]: Cannot assign to key "id" on TypedDict `Employee`
   --> src/mdtest_snippet.py:33:5
    |
 32 | def write_to_readonly_key(employee: Employee):
diff --git a/crates/ty_python_semantic/resources/mdtest/typed_dict.md b/crates/ty_python_semantic/resources/mdtest/typed_dict.md
index 2bd173a8ed..f7e3edab4f 100644
--- a/crates/ty_python_semantic/resources/mdtest/typed_dict.md
+++ b/crates/ty_python_semantic/resources/mdtest/typed_dict.md
@@ -457,7 +457,7 @@ class Person(TypedDict, total=False):
 alice: Person = {"id": 1, "name": "Alice", "age": 30}
 alice["age"] = 31  # okay
 
-# error: [invalid-assignment] "Can not assign to key "id" on TypedDict `Person`: key is marked read-only"
+# error: [invalid-assignment] "Cannot assign to key "id" on TypedDict `Person`: key is marked read-only"
 alice["id"] = 2
 ```
 
@@ -471,9 +471,9 @@ class Config(TypedDict):
 
 config: Config = {"host": "localhost", "port": 8080}
 
-# error: [invalid-assignment] "Can not assign to key "host" on TypedDict `Config`: key is marked read-only"
+# error: [invalid-assignment] "Cannot assign to key "host" on TypedDict `Config`: key is marked read-only"
 config["host"] = "127.0.0.1"
-# error: [invalid-assignment] "Can not assign to key "port" on TypedDict `Config`: key is marked read-only"
+# error: [invalid-assignment] "Cannot assign to key "port" on TypedDict `Config`: key is marked read-only"
 config["port"] = 80
 ```
 
diff --git a/crates/ty_python_semantic/src/types/typed_dict.rs b/crates/ty_python_semantic/src/types/typed_dict.rs
index e95535271e..b3fe37f867 100644
--- a/crates/ty_python_semantic/src/types/typed_dict.rs
+++ b/crates/ty_python_semantic/src/types/typed_dict.rs
@@ -165,7 +165,7 @@ pub(super) fn validate_typed_dict_key_assignment<'db, 'ast>(
             let typed_dict_d = typed_dict_ty.display(db);
 
             let mut diagnostic = builder.into_diagnostic(format_args!(
-                "Can not assign to key \"{key}\" on TypedDict `{typed_dict_d}`",
+                "Cannot assign to key \"{key}\" on TypedDict `{typed_dict_d}`",
             ));
 
             diagnostic.set_primary_message(format_args!("key is marked read-only"));