diff --git a/src/jupyter_contrib_nbextensions/nbextensions/code_font_size/code_font_size.yaml b/src/jupyter_contrib_nbextensions/nbextensions/code_font_size/code_font_size.yaml
index 02717f4..e5a79fc 100644
--- a/src/jupyter_contrib_nbextensions/nbextensions/code_font_size/code_font_size.yaml
+++ b/src/jupyter_contrib_nbextensions/nbextensions/code_font_size/code_font_size.yaml
@@ -4,4 +4,4 @@ Link: README.md
 Description: Adds toolbar buttons to increase and decrease code's font size.
              This is useful, for example, when projecting the notebook.
 Main: code_font_size.js
-Compatibility: 4.x
+Compatibility: 4.x, 5.x
diff --git a/src/jupyter_contrib_nbextensions/nbextensions/runtools/runtools.yaml b/src/jupyter_contrib_nbextensions/nbextensions/runtools/runtools.yaml
index bb42a4f..d88391e 100644
--- a/src/jupyter_contrib_nbextensions/nbextensions/runtools/runtools.yaml
+++ b/src/jupyter_contrib_nbextensions/nbextensions/runtools/runtools.yaml
@@ -4,4 +4,4 @@ Description: Runtools provide a number of additional functions for working with
 Link: readme.md
 Icon: icon.png
 Main: main.js
-Compatibility: 4.x
+Compatibility: 4.x, 5.x
diff --git a/src/jupyter_contrib_nbextensions/nbextensions/spellchecker/config.yaml b/src/jupyter_contrib_nbextensions/nbextensions/spellchecker/config.yaml
index 3b73007..9931bad 100644
--- a/src/jupyter_contrib_nbextensions/nbextensions/spellchecker/config.yaml
+++ b/src/jupyter_contrib_nbextensions/nbextensions/spellchecker/config.yaml
@@ -1,5 +1,5 @@
 Type: IPython Notebook Extension
-Compatibility: 4.x
+Compatibility: 4.x, 5.x
 Name: spellchecker
 Main: main.js
 Description: 'Adds a CodeMirror overlay mode for Typo.js spellchecking'