diff --git a/pytket/binders/circuit/main.cpp b/pytket/binders/circuit/main.cpp
index 5de2aec72f..993bce22c3 100644
--- a/pytket/binders/circuit/main.cpp
+++ b/pytket/binders/circuit/main.cpp
@@ -330,6 +330,10 @@ PYBIND11_MODULE(circuit, m) {
       .value(
           "ToffoliBox", OpType::ToffoliBox,
           "A permutation of classical basis states")
+      .value(
+          "ConjugationBox", OpType::ConjugationBox,
+          "An operation composed of 'action', 'compute' and 'uncompute' "
+          "circuits")
       .value(
           "DummyBox", OpType::DummyBox,
           "A placeholder operation that holds resource data")
diff --git a/pytket/docs/changelog.rst b/pytket/docs/changelog.rst
index f6d4cf8895..91cc90da43 100644
--- a/pytket/docs/changelog.rst
+++ b/pytket/docs/changelog.rst
@@ -11,6 +11,7 @@ Features:
 Fixes:
 
 * Handle a missing edge case in decomposition of single-qubit rotations.
+* Add missing ``OpType.ConjugationBox``.
 
 1.23.0 (January 2024)
 ---------------------
diff --git a/pytket/pytket/_tket/circuit.pyi b/pytket/pytket/_tket/circuit.pyi
index 788b155fde..058a5dd878 100644
--- a/pytket/pytket/_tket/circuit.pyi
+++ b/pytket/pytket/_tket/circuit.pyi
@@ -3122,6 +3122,8 @@ class OpType:
     
       ToffoliBox : A permutation of classical basis states
     
+      ConjugationBox : An operation composed of 'action', 'compute' and 'uncompute' circuits
+    
       DummyBox : A placeholder operation that holds resource data
     
       CustomGate : :math:`(\alpha, \beta, \ldots) \mapsto` A user-defined operation, based on a :py:class:`Circuit` :math:`C` with parameters :math:`\alpha, \beta, \ldots` substituted in place of bound symbolic variables in :math:`C`, as defined by the :py:class:`CustomGateDef`.
@@ -3220,6 +3222,7 @@ class OpType:
     CnY: typing.ClassVar[OpType]  # value = <OpType.CnY: 83>
     CnZ: typing.ClassVar[OpType]  # value = <OpType.CnZ: 82>
     Conditional: typing.ClassVar[OpType]  # value = <OpType.Conditional: 104>
+    ConjugationBox: typing.ClassVar[OpType]  # value = <OpType.ConjugationBox: 102>
     CopyBits: typing.ClassVar[OpType]  # value = <OpType.CopyBits: 16>
     CustomGate: typing.ClassVar[OpType]  # value = <OpType.CustomGate: 93>
     DiagonalBox: typing.ClassVar[OpType]  # value = <OpType.DiagonalBox: 101>
@@ -3286,7 +3289,7 @@ class OpType:
     Z: typing.ClassVar[OpType]  # value = <OpType.Z: 22>
     ZZMax: typing.ClassVar[OpType]  # value = <OpType.ZZMax: 70>
     ZZPhase: typing.ClassVar[OpType]  # value = <OpType.ZZPhase: 73>
-    __members__: typing.ClassVar[dict[str, OpType]]  # value = {'Phase': <OpType.Phase: 21>, 'Z': <OpType.Z: 22>, 'X': <OpType.X: 23>, 'Y': <OpType.Y: 24>, 'S': <OpType.S: 25>, 'Sdg': <OpType.Sdg: 26>, 'T': <OpType.T: 27>, 'Tdg': <OpType.Tdg: 28>, 'V': <OpType.V: 29>, 'Vdg': <OpType.Vdg: 30>, 'SX': <OpType.SX: 31>, 'SXdg': <OpType.SXdg: 32>, 'H': <OpType.H: 33>, 'Rx': <OpType.Rx: 34>, 'Ry': <OpType.Ry: 35>, 'Rz': <OpType.Rz: 36>, 'U1': <OpType.U1: 39>, 'U2': <OpType.U2: 38>, 'U3': <OpType.U3: 37>, 'TK1': <OpType.TK1: 40>, 'TK2': <OpType.TK2: 41>, 'CX': <OpType.CX: 42>, 'CY': <OpType.CY: 43>, 'CZ': <OpType.CZ: 44>, 'CH': <OpType.CH: 45>, 'CV': <OpType.CV: 46>, 'CVdg': <OpType.CVdg: 47>, 'CSX': <OpType.CSX: 48>, 'CSXdg': <OpType.CSXdg: 49>, 'CS': <OpType.CS: 50>, 'CSdg': <OpType.CSdg: 51>, 'CRz': <OpType.CRz: 52>, 'CRx': <OpType.CRx: 53>, 'CRy': <OpType.CRy: 54>, 'CU1': <OpType.CU1: 55>, 'CU3': <OpType.CU3: 56>, 'CCX': <OpType.CCX: 58>, 'ECR': <OpType.ECR: 66>, 'SWAP': <OpType.SWAP: 59>, 'CSWAP': <OpType.CSWAP: 60>, 'noop': <OpType.noop: 62>, 'Barrier': <OpType.Barrier: 8>, 'Label': <OpType.Label: 9>, 'Branch': <OpType.Branch: 10>, 'Goto': <OpType.Goto: 11>, 'Stop': <OpType.Stop: 12>, 'BRIDGE': <OpType.BRIDGE: 61>, 'Measure': <OpType.Measure: 63>, 'Reset': <OpType.Reset: 65>, 'CircBox': <OpType.CircBox: 84>, 'PhasePolyBox': <OpType.PhasePolyBox: 94>, 'Unitary1qBox': <OpType.Unitary1qBox: 85>, 'Unitary2qBox': <OpType.Unitary2qBox: 86>, 'Unitary3qBox': <OpType.Unitary3qBox: 87>, 'ExpBox': <OpType.ExpBox: 88>, 'PauliExpBox': <OpType.PauliExpBox: 89>, 'PauliExpPairBox': <OpType.PauliExpPairBox: 90>, 'PauliExpCommutingSetBox': <OpType.PauliExpCommutingSetBox: 91>, 'QControlBox': <OpType.QControlBox: 95>, 'ToffoliBox': <OpType.ToffoliBox: 107>, 'DummyBox': <OpType.DummyBox: 109>, 'CustomGate': <OpType.CustomGate: 93>, 'Conditional': <OpType.Conditional: 104>, 'ISWAP': <OpType.ISWAP: 67>, 'PhasedISWAP': <OpType.PhasedISWAP: 79>, 'XXPhase': <OpType.XXPhase: 71>, 'YYPhase': <OpType.YYPhase: 72>, 'ZZPhase': <OpType.ZZPhase: 73>, 'XXPhase3': <OpType.XXPhase3: 74>, 'PhasedX': <OpType.PhasedX: 68>, 'NPhasedX': <OpType.NPhasedX: 69>, 'CnRy': <OpType.CnRy: 80>, 'CnX': <OpType.CnX: 81>, 'CnY': <OpType.CnY: 83>, 'CnZ': <OpType.CnZ: 82>, 'ZZMax': <OpType.ZZMax: 70>, 'ESWAP': <OpType.ESWAP: 75>, 'FSim': <OpType.FSim: 76>, 'Sycamore': <OpType.Sycamore: 77>, 'ISWAPMax': <OpType.ISWAPMax: 78>, 'ClassicalTransform': <OpType.ClassicalTransform: 13>, 'WASM': <OpType.WASM: 14>, 'SetBits': <OpType.SetBits: 15>, 'CopyBits': <OpType.CopyBits: 16>, 'RangePredicate': <OpType.RangePredicate: 17>, 'ExplicitPredicate': <OpType.ExplicitPredicate: 18>, 'ExplicitModifier': <OpType.ExplicitModifier: 19>, 'MultiBit': <OpType.MultiBit: 20>, 'ClassicalExpBox': <OpType.ClassicalExpBox: 103>, 'MultiplexorBox': <OpType.MultiplexorBox: 96>, 'MultiplexedRotationBox': <OpType.MultiplexedRotationBox: 97>, 'MultiplexedU2Box': <OpType.MultiplexedU2Box: 98>, 'MultiplexedTensoredU2Box': <OpType.MultiplexedTensoredU2Box: 99>, 'StatePreparationBox': <OpType.StatePreparationBox: 100>, 'DiagonalBox': <OpType.DiagonalBox: 101>}
+    __members__: typing.ClassVar[dict[str, OpType]]  # value = {'Phase': <OpType.Phase: 21>, 'Z': <OpType.Z: 22>, 'X': <OpType.X: 23>, 'Y': <OpType.Y: 24>, 'S': <OpType.S: 25>, 'Sdg': <OpType.Sdg: 26>, 'T': <OpType.T: 27>, 'Tdg': <OpType.Tdg: 28>, 'V': <OpType.V: 29>, 'Vdg': <OpType.Vdg: 30>, 'SX': <OpType.SX: 31>, 'SXdg': <OpType.SXdg: 32>, 'H': <OpType.H: 33>, 'Rx': <OpType.Rx: 34>, 'Ry': <OpType.Ry: 35>, 'Rz': <OpType.Rz: 36>, 'U1': <OpType.U1: 39>, 'U2': <OpType.U2: 38>, 'U3': <OpType.U3: 37>, 'TK1': <OpType.TK1: 40>, 'TK2': <OpType.TK2: 41>, 'CX': <OpType.CX: 42>, 'CY': <OpType.CY: 43>, 'CZ': <OpType.CZ: 44>, 'CH': <OpType.CH: 45>, 'CV': <OpType.CV: 46>, 'CVdg': <OpType.CVdg: 47>, 'CSX': <OpType.CSX: 48>, 'CSXdg': <OpType.CSXdg: 49>, 'CS': <OpType.CS: 50>, 'CSdg': <OpType.CSdg: 51>, 'CRz': <OpType.CRz: 52>, 'CRx': <OpType.CRx: 53>, 'CRy': <OpType.CRy: 54>, 'CU1': <OpType.CU1: 55>, 'CU3': <OpType.CU3: 56>, 'CCX': <OpType.CCX: 58>, 'ECR': <OpType.ECR: 66>, 'SWAP': <OpType.SWAP: 59>, 'CSWAP': <OpType.CSWAP: 60>, 'noop': <OpType.noop: 62>, 'Barrier': <OpType.Barrier: 8>, 'Label': <OpType.Label: 9>, 'Branch': <OpType.Branch: 10>, 'Goto': <OpType.Goto: 11>, 'Stop': <OpType.Stop: 12>, 'BRIDGE': <OpType.BRIDGE: 61>, 'Measure': <OpType.Measure: 63>, 'Reset': <OpType.Reset: 65>, 'CircBox': <OpType.CircBox: 84>, 'PhasePolyBox': <OpType.PhasePolyBox: 94>, 'Unitary1qBox': <OpType.Unitary1qBox: 85>, 'Unitary2qBox': <OpType.Unitary2qBox: 86>, 'Unitary3qBox': <OpType.Unitary3qBox: 87>, 'ExpBox': <OpType.ExpBox: 88>, 'PauliExpBox': <OpType.PauliExpBox: 89>, 'PauliExpPairBox': <OpType.PauliExpPairBox: 90>, 'PauliExpCommutingSetBox': <OpType.PauliExpCommutingSetBox: 91>, 'QControlBox': <OpType.QControlBox: 95>, 'ToffoliBox': <OpType.ToffoliBox: 107>, 'ConjugationBox': <OpType.ConjugationBox: 102>, 'DummyBox': <OpType.DummyBox: 109>, 'CustomGate': <OpType.CustomGate: 93>, 'Conditional': <OpType.Conditional: 104>, 'ISWAP': <OpType.ISWAP: 67>, 'PhasedISWAP': <OpType.PhasedISWAP: 79>, 'XXPhase': <OpType.XXPhase: 71>, 'YYPhase': <OpType.YYPhase: 72>, 'ZZPhase': <OpType.ZZPhase: 73>, 'XXPhase3': <OpType.XXPhase3: 74>, 'PhasedX': <OpType.PhasedX: 68>, 'NPhasedX': <OpType.NPhasedX: 69>, 'CnRy': <OpType.CnRy: 80>, 'CnX': <OpType.CnX: 81>, 'CnY': <OpType.CnY: 83>, 'CnZ': <OpType.CnZ: 82>, 'ZZMax': <OpType.ZZMax: 70>, 'ESWAP': <OpType.ESWAP: 75>, 'FSim': <OpType.FSim: 76>, 'Sycamore': <OpType.Sycamore: 77>, 'ISWAPMax': <OpType.ISWAPMax: 78>, 'ClassicalTransform': <OpType.ClassicalTransform: 13>, 'WASM': <OpType.WASM: 14>, 'SetBits': <OpType.SetBits: 15>, 'CopyBits': <OpType.CopyBits: 16>, 'RangePredicate': <OpType.RangePredicate: 17>, 'ExplicitPredicate': <OpType.ExplicitPredicate: 18>, 'ExplicitModifier': <OpType.ExplicitModifier: 19>, 'MultiBit': <OpType.MultiBit: 20>, 'ClassicalExpBox': <OpType.ClassicalExpBox: 103>, 'MultiplexorBox': <OpType.MultiplexorBox: 96>, 'MultiplexedRotationBox': <OpType.MultiplexedRotationBox: 97>, 'MultiplexedU2Box': <OpType.MultiplexedU2Box: 98>, 'MultiplexedTensoredU2Box': <OpType.MultiplexedTensoredU2Box: 99>, 'StatePreparationBox': <OpType.StatePreparationBox: 100>, 'DiagonalBox': <OpType.DiagonalBox: 101>}
     noop: typing.ClassVar[OpType]  # value = <OpType.noop: 62>
     @staticmethod
     def from_name(arg0: str) -> OpType: