diff --git a/pyproject.toml b/pyproject.toml
index 923e088..6669fe3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,9 +86,9 @@ test = [
     "pytest>=6.2.0",
 ]
 docs = [
-    "sphinx>=6.1.0",
-    "sphinx-rtd-theme>=1.3.0",
-    "myst_parser>=1.0.0",
+    "sphinx==6.2.1",
+    "sphinx-rtd-theme==2.0.0",
+    "myst_parser==1.0.0",
 ]
 dev = [
     "oakutils[o3d]",