diff --git a/README.md b/README.md
index 07b1541..4c8506a 100644
--- a/README.md
+++ b/README.md
@@ -160,8 +160,8 @@ welltestpy.tools     # Subpackage with miscellaneous tools
 
 - [NumPy >= 1.13.0](https://www.numpy.org)
 - [SciPy >= 0.19.1](https://www.scipy.org)
-- [Pandas >= 0.23.0](https://pandas.pydata.org)
-- [Matplotlib >= 2.2.0](https://matplotlib.org)
+- [Pandas >= 0.20.3](https://pandas.pydata.org)
+- [Matplotlib >= 2.0.2](https://matplotlib.org)
 - [AnaFlow](https://github.com/GeoStat-Framework/AnaFlow)
 - [SpotPy](https://github.com/thouska/spotpy)
 
diff --git a/docs/requirements.txt b/docs/requirements.txt
index f6a07fa..175eac8 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,8 +1,8 @@
 #required for readthedocs.org
 numpy>=1.13.0
 scipy>=0.19.1
-pandas>=0.23.0
+pandas>=0.20.3
+matplotlib>=2.0.2
 anaflow
-matplotlib
 spotpy
 numpydoc
diff --git a/setup.py b/setup.py
index 2af6c65..5431ef7 100644
--- a/setup.py
+++ b/setup.py
@@ -75,9 +75,9 @@ def find_version(*file_paths):
     install_requires=[
         "numpy>=1.13.0",
         "scipy>=0.19.1",
-        "pandas>=0.23.0",
+        "pandas>=0.20.3",
+        "matplotlib>=2.0.2",
         "anaflow",
-        "matplotlib",
         "spotpy",
     ],
     packages=find_packages(exclude=["tests*", "docs*"]),