diff --git a/pyproject.toml b/pyproject.toml
index 6424fa1..bede962 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,10 +50,10 @@ doc_build = [
   "myst-parser",
   "pandas",
   "matplotlib",
-  "ipykernel",
-  "jupyter",
-  "nbconvert",
-  "notedown"
+  "ipykernel==6.29",
+  "jupyter==1.1",
+  "nbconvert==7.16",
+  "notedown==1.5"
 ]
 
 [tool.mypy]