diff --git a/test_package/nbconvert/env/darwin.txt b/test_package/nbconvert/env/darwin.txt
index a638deb..32ec3f9 100644
--- a/test_package/nbconvert/env/darwin.txt
+++ b/test_package/nbconvert/env/darwin.txt
@@ -18,7 +18,7 @@ jsonschema-specifications==2025.4.1
     # via jsonschema
 jupyter-client==8.6.3
     # via nbclient
-jupyter-core==5.8.1
+jupyter-core==5.9.1
     # via
     #   jupyter-client
     #   nbclient
diff --git a/test_package/nbconvert/env/linux.txt b/test_package/nbconvert/env/linux.txt
index a638deb..32ec3f9 100644
--- a/test_package/nbconvert/env/linux.txt
+++ b/test_package/nbconvert/env/linux.txt
@@ -18,7 +18,7 @@ jsonschema-specifications==2025.4.1
     # via jsonschema
 jupyter-client==8.6.3
     # via nbclient
-jupyter-core==5.8.1
+jupyter-core==5.9.1
     # via
     #   jupyter-client
     #   nbclient
diff --git a/test_package/nbconvert/env/win32.txt b/test_package/nbconvert/env/win32.txt
index 14abe46..4697137 100644
--- a/test_package/nbconvert/env/win32.txt
+++ b/test_package/nbconvert/env/win32.txt
@@ -18,7 +18,7 @@ jsonschema-specifications==2025.4.1
     # via jsonschema
 jupyter-client==8.6.3
     # via nbclient
-jupyter-core==5.8.1
+jupyter-core==5.9.1
     # via
     #   jupyter-client
     #   nbclient