diff --git a/_metadata.py b/_metadata.py
index 3347fde..38b2144 100644
--- a/_metadata.py
+++ b/_metadata.py
@@ -1,2 +1,2 @@
-__extension_version__ = "0.39.0"
+__extension_version__ = "0.40.0"
 __extension_name__ = "pytket-qsharp"
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 8b11aa4..8f47b78 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,11 @@
 Changelog
 ~~~~~~~~~
 
+0.40.0 (March 2024)
+-------------------
+
+* Updated pytket version requirement to 1.26.
+
 0.39.0 (January 2024)
 ---------------------
 
diff --git a/setup.py b/setup.py
index 100e1e9..296c462 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
     packages=find_namespace_packages(include=["pytket.*"]),
     include_package_data=True,
     install_requires=[
-        "pytket ~= 1.24",
+        "pytket ~= 1.26",
         "qsharp ~= 0.28.291394",
         "qsharp-core ~= 0.28.291394",
         "markdown",