diff --git a/test_package/nbconvert/env/darwin.txt b/test_package/nbconvert/env/darwin.txt
index a638deb..dd560da 100644
--- a/test_package/nbconvert/env/darwin.txt
+++ b/test_package/nbconvert/env/darwin.txt
@@ -44,7 +44,7 @@ packaging==25.0
     # via nbconvert
 pandocfilters==1.5.1
     # via nbconvert
-platformdirs==4.3.8
+platformdirs==4.5.1
     # via jupyter-core
 pygments==2.19.2
     # via nbconvert
diff --git a/test_package/nbconvert/env/linux.txt b/test_package/nbconvert/env/linux.txt
index a638deb..dd560da 100644
--- a/test_package/nbconvert/env/linux.txt
+++ b/test_package/nbconvert/env/linux.txt
@@ -44,7 +44,7 @@ packaging==25.0
     # via nbconvert
 pandocfilters==1.5.1
     # via nbconvert
-platformdirs==4.3.8
+platformdirs==4.5.1
     # via jupyter-core
 pygments==2.19.2
     # via nbconvert
diff --git a/test_package/nbconvert/env/win32.txt b/test_package/nbconvert/env/win32.txt
index 14abe46..badf5a0 100644
--- a/test_package/nbconvert/env/win32.txt
+++ b/test_package/nbconvert/env/win32.txt
@@ -44,7 +44,7 @@ packaging==25.0
     # via nbconvert
 pandocfilters==1.5.1
     # via nbconvert
-platformdirs==4.3.8
+platformdirs==4.5.1
     # via jupyter-core
 pygments==2.19.2
     # via nbconvert