diff --git a/docs/changelog.rst b/docs/changelog.rst
index 83be035e..e3b57ccf 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,12 @@
 Changelog
 ~~~~~~~~~
 
+Unreleased
+----------
+
+* Fix conversion of symbols into qiskit.
+* Require qiskit >= 1.2.0.
+
 0.55.0 (July 2024)
 ------------------
 
diff --git a/pytket/extensions/qiskit/qiskit_convert.py b/pytket/extensions/qiskit/qiskit_convert.py
index 69edbc53..116997aa 100644
--- a/pytket/extensions/qiskit/qiskit_convert.py
+++ b/pytket/extensions/qiskit/qiskit_convert.py
@@ -35,6 +35,7 @@
 
 import numpy as np
 from symengine import sympify  # type: ignore
+from symengine.lib import symengine_wrapper  # type: ignore
 
 import sympy
 import qiskit.circuit.library.standard_gates as qiskit_gates  # type: ignore
@@ -846,7 +847,9 @@ def tk_to_qiskit(
             # See Parameter.__init__() in qiskit/circuit/parameter.py.
             new_p = Parameter(p_name)
             new_p._uuid = uuid
-            new_p._parameter_keys = frozenset(((p_name, uuid),))
+            new_p._parameter_keys = frozenset(
+                ((symengine_wrapper.Symbol(p_name), uuid),)
+            )
             new_p._hash = hash((new_p._parameter_keys, new_p._symbol_expr))
             updates[p] = new_p
     qcirc.assign_parameters(updates, inplace=True)
diff --git a/setup.py b/setup.py
index 85e001e0..864aa2f9 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@
     include_package_data=True,
     install_requires=[
         "pytket >= 1.30.0",
-        "qiskit >= 1.1",
+        "qiskit >= 1.2.0",
         "qiskit-algorithms >= 0.3.0",
         "qiskit-ibm-runtime >= 0.24.1",
         "qiskit-aer >= 0.14.2",