diff --git a/RATapi/utils/enums.py b/RATapi/utils/enums.py
index 06da0b1d..550b583f 100644
--- a/RATapi/utils/enums.py
+++ b/RATapi/utils/enums.py
@@ -172,6 +172,9 @@ class Priors(RATEnum):
     """A Gaussian distribution centred on the parameter value,
     with shape defined by ``mu`` and ``sigma`` for the parameter."""
 
+    Jeffreys = "jeffreys"
+    """A Jeffreys' prior distribution over the parameter range."""
+
 
 # Project
 class Calculations(RATEnum):
diff --git a/cpp/RAT b/cpp/RAT
index 62421f6d..282d17be 160000
--- a/cpp/RAT
+++ b/cpp/RAT
@@ -1 +1 @@
-Subproject commit 62421f6df7e2d5bb16c628a944d5955aea609d37
+Subproject commit 282d17beb964af0855c1b2cc412e0b187b1a4140