diff --git a/R/DESCRIPTION b/R/DESCRIPTION
index 845f475..80fb7c2 100644
--- a/R/DESCRIPTION
+++ b/R/DESCRIPTION
@@ -19,7 +19,7 @@ Imports:
     extraDistr,
     ggplot2,
     grid,
-    rstan,
+    rstan (>= 2.14.0),
     scales,
     stats,
     tidyr,
diff --git a/python/setup.py b/python/setup.py
index 6cccfc9..4381df0 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -78,13 +78,13 @@ setup(
     packages=['fbprophet', 'fbprophet.tests'],
     setup_requires=[
         'Cython>=0.22',
-        'pystan>=2.8',
+        'pystan>=2.14',
     ],
     install_requires=[
         'matplotlib',
         'numpy',
         'pandas>=0.16',
-        'pystan>=2.8',
+        'pystan>=2.14',
     ],
     zip_safe=False,
     include_package_data=True,