diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index b313ddc..5593792 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -10,7 +10,7 @@ source:
 
 build:
   noarch: python
-  number: 0
+  number: 1
   script:
     - {{ PYTHON }} -m pip install . --no-deps --ignore-installed --no-cache-dir -vvv
   entry_points:
@@ -29,7 +29,7 @@ requirements:
     - jupyter_client >=6.1.1
     - jupyter_core >=4.6.0
     - nbconvert
-    - nbformat
+    - nbformat >=5.2.0
     - packaging
     - prometheus_client
     - python >=3.7