diff --git a/setup.py b/setup.py
index 916fb889a..82cc2e171 100644
--- a/setup.py
+++ b/setup.py
@@ -13,38 +13,47 @@
     history = history_file.read()
 
 requirements = [
-    "Click>=7.0",
-    "PyGithub",
-    "colorama",
-    "coloredlogs",
-    "emoji",
-    "f90nml",
-    "gfw-creator",
-    "gitpython",
-    "loguru",
-    "numpy",
-    "packaging",
-    "pandas>=1.0",
-    "psutil",
-    "pyyaml",
-    "pyyaml>=5.1",
-    "questionary",
-    "semver",
-    "sqlalchemy",
-    "tabulate",
-    "tqdm",
-    "typing_extensions>=3.10.0.0",
-    "xdgenvpy",
+    "Click==8.0.4",  # Maximum version for Python 3.6 support
+    "PyGithub==1.55",
+    "colorama==0.4.5",
+    "coloredlogs==15.0.1",  # NOTE(PG): Should be removed during cleanup for loguru instead
+    "emoji==1.7.0",
+    "f90nml==1.4.2",
+    "gfw-creator==0.2.2",
+    "gitpython==3.1.20",  # Maximum version for Python 3.6 support
+    "loguru==0.6.0",
+    "numpy==1.19.5",  # Maximum version for Python 3.6 support
+    "packaging==21.3",
+    "pandas==1.1.5",  # Correct compatiability with xarray for Python 3.6
+    "psutil==5.9.1",
+    "pyyaml==5.1",
+    "questionary==1.10.0",
+    "semver==2.13.0",
+    "sqlalchemy==1.4.39",
+    "tabulate==0.8.10",
+    "tqdm==4.64.0",
+    "typing_extensions==4.1.1",  # Maximum number for Python 3.6 support
+    "xdgenvpy==2.3.5",
 ]
 
 setup_requirements = []
 
-test_requirements = ["pyfakefs"]
+test_requirements = [
+    "pyfakefs==4.6.0",
+]
 
 setup(
-    author="Dirk Barbi",
-    author_email="dirk.barbi@awi.de",
-    python_requires=">=3.6, <=3.11",
+    author="The ESM Tools Team",
+    author_email=[
+        "dirk.barbi@awi.de",
+        "paul.gierz@awi.de",
+        "miguel.andres-martinez@awi.de",
+        "deniz.ural@awi.de",
+        "jan.streffing@awi.de",
+        "sebastian.wahl@geomar.de",
+	      "kai.himstedt@dkrz.de",
+    ],
+    python_requires=">=3.6, <3.10",
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Intended Audience :: Science/Research",