diff --git a/pyproject.toml b/pyproject.toml
index 54f976d..01a174d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,9 +21,9 @@ readme = "README.md"
 requires-python = ">=3.9"
 dependencies = [
     "MDAnalysis>=2.0.0",
-    "hmmlearn",
-    "networkx",
-    "numpy",
+    "hmmlearn == 0.3.2",
+    "networkx == 3.2.1",
+    "numpy == 1.26.4",
     "scikit-learn == 1.4.2",
     "scipy == 1.13.0"