diff --git a/.github/workflows/apidocs_builder.yml b/.github/workflows/apidocs_builder.yml
index 45aed13cf3..431d8ca2f2 100644
--- a/.github/workflows/apidocs_builder.yml
+++ b/.github/workflows/apidocs_builder.yml
@@ -22,13 +22,13 @@ jobs:
       blender_version: "2.93"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.9
     - name: Cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ./installation
         key: blender-${{ env.blender_version }}-${{ hashFiles('.github/workflows/apidocs_builder.yml') }}
diff --git a/.github/workflows/building_docs_test.yml b/.github/workflows/building_docs_test.yml
index 29a17d4631..3fc730d38d 100644
--- a/.github/workflows/building_docs_test.yml
+++ b/.github/workflows/building_docs_test.yml
@@ -12,7 +12,7 @@ jobs:
   build_docs:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: ammaraskar/sphinx-action@master
       with:
 
@@ -20,4 +20,4 @@ jobs:
         # https://www.sphinx-doc.org/en/master/man/sphinx-build.html
         # https://www.sphinx-doc.org/en/master/usage/builders/index.html?highlight=DummyBuilder#sphinx.builders.dummy.DummyBuilder
         build-command: sphinx-build -W --keep-going -b dummy . _test
-        pre-build-command: pip install sphinx-rtd-theme
+        pre-build-command: pip install sphinx-rtd-theme==1.2.2
diff --git a/.github/workflows/test-sverchok.yml b/.github/workflows/test-sverchok.yml
index b44f355ea7..f86a201b95 100644
--- a/.github/workflows/test-sverchok.yml
+++ b/.github/workflows/test-sverchok.yml
@@ -16,13 +16,13 @@ jobs:
       blender_version: "2.93"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.9
     - name: Cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ./installation
         key: blender-${{ env.blender_version }}-${{ hashFiles('.github/workflows/test-sverchok.yml') }}
@@ -75,7 +75,7 @@ jobs:
           ./installation/blender/blender-softwaregl
 
     - name: Save logs
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: log_files
diff --git a/docs/tutorials/Celling_00/celling_03.rst b/docs/tutorials/Celling_00/celling_03.rst
new file mode 100644
index 0000000000..1004564ac9
--- /dev/null
+++ b/docs/tutorials/Celling_00/celling_03.rst
@@ -0,0 +1,5 @@
+*********************************
+Celling 03. Flattening and offset
+*********************************
+
+TODO
\ No newline at end of file
diff --git a/docs/tutorials/Celling_00/celling_04.rst b/docs/tutorials/Celling_00/celling_04.rst
new file mode 100644
index 0000000000..fb17dbf400
--- /dev/null
+++ b/docs/tutorials/Celling_00/celling_04.rst
@@ -0,0 +1,5 @@
+******************************************
+Celling 04. Types definition with checking
+******************************************
+
+TODO
\ No newline at end of file
diff --git a/docs/tutorials/Celling_00/celling_05.rst b/docs/tutorials/Celling_00/celling_05.rst
new file mode 100644
index 0000000000..727cfecf0f
--- /dev/null
+++ b/docs/tutorials/Celling_00/celling_05.rst
@@ -0,0 +1,5 @@
+**************************************
+Celling 05. "Layouts" on "paper space"
+**************************************
+
+TODO
\ No newline at end of file
diff --git a/docs/tutorials/Celling_00/celling_06.rst b/docs/tutorials/Celling_00/celling_06.rst
new file mode 100644
index 0000000000..2baebff850
--- /dev/null
+++ b/docs/tutorials/Celling_00/celling_06.rst
@@ -0,0 +1,5 @@
+***********************************
+Celling 06. SVG/DXF/XMLX/IFC export
+***********************************
+
+TODO
\ No newline at end of file