diff --git a/tests/requirements.colab.2024.02.txt b/tests/requirements.colab.2024.02.txt
index 4933e178..b4b23046 100644
--- a/tests/requirements.colab.2024.02.txt
+++ b/tests/requirements.colab.2024.02.txt
@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.6
 graphviz==0.21
 jupyter-client==8.8.0
 jupyter-console==6.6.3
diff --git a/tests/requirements.colab.2025.02.txt b/tests/requirements.colab.2025.02.txt
index de6609c3..298977b4 100644
--- a/tests/requirements.colab.2025.02.txt
+++ b/tests/requirements.colab.2025.02.txt
@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.6
 graphviz==0.21
 html5lib==1.1
 ipywidgets==8.1.8
diff --git a/tests/requirements.colab.2026.02.txt b/tests/requirements.colab.2026.02.txt
index ebfe0241..981759ef 100644
--- a/tests/requirements.colab.2026.02.txt
+++ b/tests/requirements.colab.2026.02.txt
@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.6
 graphviz==0.21
 html5lib==1.1
 ipywidgets==8.1.8