diff --git a/pyproject.toml b/pyproject.toml
index c307e72..6eb542f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,9 +35,9 @@ Documentation = "https://sphinx-design.readthedocs.io"
 
 [project.optional-dependencies]
 code-style = ["pre-commit>=3,<4"]
-rtd = ["myst-parser>=1,<3"]
+rtd = ["myst-parser>=1,<4"]
 testing = [
-    "myst-parser>=1,<3",
+    "myst-parser>=1,<4",
     "pytest~=7.1",
     "pytest-cov",
     "pytest-regressions",