diff --git a/pyproject.toml b/pyproject.toml
index ec4679b..cdef2f5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,11 +3,11 @@ name = "jorisjonkers-commons"
 version = "0.1.0"
 description = "Shared Python packages for estate services."
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = "==3.15.2"
 license = "LicenseRef-JorisJonkers-Proprietary-1.0"
 license-files = ["LICENSE"]
 dependencies = [
-  "cryptography>=44",
+  "cryptography==50.0.2",
 ]
 
 [dependency-groups]
@@ -19,7 +19,7 @@ dev = [
 ]
 
 [build-system]
-requires = ["hatchling>=1.27"]
+requires = ["hatchling==1.33.0"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]