diff --git a/conda-envs/environment-test.yml b/conda-envs/environment-test.yml
index be871892d..867f569ff 100644
--- a/conda-envs/environment-test.yml
+++ b/conda-envs/environment-test.yml
@@ -4,7 +4,7 @@ channels:
 - defaults
 dependencies:
 - pip
-- pymc>=5.1.2
+- pymc>=5.0.2
 - pytest-cov>=2.5
 - pytest>=3.0
 - dask
diff --git a/conda-envs/windows-environment-test.yml b/conda-envs/windows-environment-test.yml
index 5a27e5700..aaeb57bb2 100644
--- a/conda-envs/windows-environment-test.yml
+++ b/conda-envs/windows-environment-test.yml
@@ -4,7 +4,7 @@ channels:
 - defaults
 dependencies:
 - pip
-- pymc>=5.1.2
+- pymc>=5.0.2
 - pytest-cov>=2.5
 - pytest>=3.0
 - dask
diff --git a/requirements.txt b/requirements.txt
index af926a86c..6c55c394f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-pymc>=5.1.2
+pymc>=5.0.2