diff --git a/pyproject.toml b/pyproject.toml
index be3623439..87ca91b70 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,12 +42,12 @@ torch = {version=">=2.0.0, !=2.0.1, !=2.1.0", optional=true}
 pandas = "*"
 numba = "^0.58.1"
 scikit-fda = {version="^0.9", optional=true}
-scikit-learn = {version="*", optional=true}
-sphinx = {version="*", optional=true}
-sphinx-gallery = { version= "*", optional=true}
-sphinx-math-dollar = {version="*", optional=true}
-numpydoc = {version="*", optional=true}
-myst-parser = {version="*", optional=true}
+scikit-learn = {version="1.2.2", optional=true}
+sphinx = {version="6.2.1", optional=true}
+sphinx-gallery = { version= "^0.14.0", optional=true}
+sphinx-math-dollar = {version="^1.2.1", optional=true}
+numpydoc = {version="^1.6.0", optional=true}
+myst-parser = {version="^2.0.0", optional=true}
 
 
 ########### hack : some dependencies are not compatible #############