diff --git a/src/vws/reports.py b/src/vws/reports.py
index 3d157a78..431cfcaa 100644
--- a/src/vws/reports.py
+++ b/src/vws/reports.py
@@ -10,7 +10,7 @@
 
 
 @beartype
-@dataclass
+@dataclass(frozen=True)
 class DatabaseSummaryReport:
     """
     A database summary report.
@@ -47,7 +47,7 @@ class TargetStatuses(Enum):
 
 
 @beartype
-@dataclass
+@dataclass(frozen=True)
 class TargetSummaryReport:
     """
     A target summary report.
@@ -68,7 +68,7 @@ class TargetSummaryReport:
 
 
 @beartype(conf=BeartypeConf(is_pep484_tower=True))
-@dataclass
+@dataclass(frozen=True)
 class TargetRecord:
     """
     A target record.
@@ -86,7 +86,7 @@ class TargetRecord:
 
 
 @beartype
-@dataclass
+@dataclass(frozen=True)
 class TargetData:
     """
     The target data optionally included with a query match.
@@ -98,7 +98,7 @@ class TargetData:
 
 
 @beartype
-@dataclass
+@dataclass(frozen=True)
 class QueryResult:
     """
     One query match result.
@@ -112,7 +112,7 @@ class QueryResult:
 
 
 @beartype
-@dataclass
+@dataclass(frozen=True)
 class TargetStatusAndRecord:
     """
     The target status and a target record.
diff --git a/src/vws/types.py b/src/vws/types.py
index e6f59145..22e91260 100644
--- a/src/vws/types.py
+++ b/src/vws/types.py
@@ -5,7 +5,7 @@
 from beartype import beartype
 
 
-@dataclass
+@dataclass(frozen=True)
 @beartype
 class Response:
     """