diff --git a/docs/rtd_env.yml b/docs/rtd_env.yml
index 67dc2b9..f9ec9ee 100644
--- a/docs/rtd_env.yml
+++ b/docs/rtd_env.yml
@@ -5,19 +5,19 @@ channels:
 dependencies:
   - python=3.7
   - basemap>=1.1.0
-  - dask
-  - matplotlib
-  - netcdf4
-  - numpy
-  - numpydoc
-  - pandas
-  - pip
-  - psutil
-  - scipy
+  - dask=2.1.0
+  - matplotlib=3.1.0
+  - netcdf4=1.5.3
+  - numpy=1.16.4
+  - numpydoc=0.9.1
+  - pandas=0.24.2
+  - pip=19.1.1
+  - psutil=5.6.3
+  - scipy=1.3.0
   - seaborn=0.9.0
-  - setuptools
-  - sphinx
-  - xarray
-  - yaml
+  - setuptools=41.0.1
+  - sphinx=2.1.2
+  - xarray=0.14.1
+  - yaml=0.1.7
   - pip:
     - sphinx-rtd-theme