diff --git a/README.md b/README.md
index e3e250c..33fc007 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ The pyEGA3 download client is a python-based tool for viewing and downloading fi
 
 ## Requirements
 
-* Python3 ([download instructions](https://www.python.org/downloads/))
+* Python 3.6 or newer. ([download instructions](https://www.python.org/downloads/))
 
 ### Firewall ports
 
@@ -107,6 +107,21 @@ If the ports are open, both of the sites should load with no timeouts.
     pyega3/pyega3.py --help
     ```
 
+### Using Docker
+
+There are Docker images built by Bioconda: https://bioconda.github.io/recipes/pyega3/README.html  
+An example of running pyEGA3 in a Docker container:
+
+```bash
+docker run --rm -v /tmp:/app -w /app quay.io/biocontainers/pyega3:3.4.0--py_0 pyega3 -d -t fetch EGAF00001775036
+```
+
+This example command mounts your /tmp folder into the Docker container as /app,
+starts the 3.4.0 version of pyEGA3 and downloads a test file.
+The test file will be downloaded into your /tmp folder.
+You can find other, possibly newer, versions ("tags") of the pyEGA3 Docker image
+on the above-mentioned Bioconda page.
+
 ## Usage - File download
 
 ```bash
diff --git a/pyega3/pyega3.py b/pyega3/pyega3.py
index e840197..50cbc73 100755
--- a/pyega3/pyega3.py
+++ b/pyega3/pyega3.py
@@ -19,7 +19,7 @@
 import requests
 from tqdm import tqdm
 
-version = "3.4.0"
+version = "3.4.1"
 session_id = random.getrandbits(32)
 logging_level = logging.INFO
 
diff --git a/setup.py b/setup.py
index 56efa7c..616be49 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,25 @@
+import sys
+
 from setuptools import setup, find_packages
 
+CURRENT_PYTHON_VERSION = sys.version_info[:2]
+
+# When changing the value of the REQUIRED_PYTHON_VERSION variable,
+# make sure to also change the "python_requires" variable
+# and the "classifiers" section in this file (setup.py).
+REQUIRED_PYTHON_VERSION = (3, 6)
+
+if CURRENT_PYTHON_VERSION < REQUIRED_PYTHON_VERSION:
+    sys.stderr.write("""
+==========================
+Unsupported Python version
+==========================
+This version of pyEGA3 requires Python {}.{}, but you're trying to
+install it on Python {}.{}. Please try to upgrade to a newer Python
+version or maybe use pyEGA3 in a Docker container (see the README for that).
+""".format(*(REQUIRED_PYTHON_VERSION + CURRENT_PYTHON_VERSION)))
+    sys.exit(1)
+
 with open("README.md", encoding='utf-8') as f:
     long_description = f.read()
 
@@ -9,9 +29,10 @@
     long_description=long_description,
     long_description_content_type="text/plain",
     packages=find_packages(),
-    version = "3.4.0",
+    version="3.4.1",
     author="EGA team",
     author_email="ega-helpdesk@ebi.ac.uk",
+    python_requires=">=3.6",
     install_requires=["requests", "tqdm", "htsget", "psutil"],
     keywords=["EGA", "archive"],
     license="Apache License, Version 2.0",
@@ -21,11 +42,11 @@
         "Development Status :: 3 - Alpha",
         "Topic :: Scientific/Engineering :: Bio-Informatics",
         "License :: OSI Approved :: Apache Software License",
-        "Programming Language :: Python :: 3.5"
-    ],    
+        "Programming Language :: Python :: 3.6"
+    ],
     entry_points={
-            "console_scripts": [
-                "pyega3 = pyega3.pyega3:main",
-            ]
-        }
+        "console_scripts": [
+            "pyega3 = pyega3.pyega3:main",
+        ]
+    }
 )