diff --git a/requirements.txt b/requirements.txt
index 8b22fe9..4390a4b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,10 +4,10 @@ matplotlib>=2.1.1
 numpy>=1.13.1
 numpydoc>=0.7.0
 pandas>=0.21.1
-pymc3>=3.4.1
+pymc3==3.4.1
 scikit-learn>=0.19.1
 scipy>=1.0.0
 seaborn>=0.8.1
 six>=1.10.0
-theano>=1.0.0
+theano>=1.0.4
 tqdm>=4.8.4