diff --git a/setup.py b/setup.py
index 4ce20d9..a4af4aa 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
     license="Apache 2",
     packages=find_namespace_packages(include=["pytket.*"]),
     include_package_data=True,
-    install_requires=["pytket ~= 1.20", "iqm-client ~= 14.0"],
+    install_requires=["pytket ~= 1.21", "iqm-client ~= 14.0"],
     classifiers=[
         "Environment :: Console",
         "Programming Language :: Python :: 3.9",