diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f1435a21..81af805a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -26,7 +26,7 @@ jobs:
       matrix:
         python-version: ["3.6", "3.12"]
         # NOTE: align with versions in noxfile.py:
-        cocotb-version: ["1.6.0", "1.9.0", "github-828d127e"]
+        cocotb-version: ["1.6.0", "1.9.0", "github-b9dd5ee1"]
         include:
         - sim: icarus
           sim-version: apt
diff --git a/noxfile.py b/noxfile.py
index a3643ea6..f8f148d6 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -2,7 +2,7 @@
 
 
 @nox.session
-@nox.parametrize("cocotb", ["1.6.0", "1.9.0", "github-828d127e"])
+@nox.parametrize("cocotb", ["1.6.0", "1.9.0", "github-b9dd5ee1"])
 def tests(session, cocotb):
     if cocotb.startswith("github-"):
         cocotb_req = "git+https://github.com/cocotb/cocotb@" + cocotb[len("github-"):]