diff --git a/README.md b/README.md
index e130e2a..7920fb5 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,13 @@ The format for the ROI mask is an nd numpy array of type bool. It is an array of
 pip install rt_utils
 ```
 
+## Installation in editable mode
+```
+git clone https://github.com/qurit/rt-utils.git
+cd rt-utils
+pip install -e .
+```
+
 ## Creating new RT Structs
 ```Python
 from rt_utils import RTStructBuilder
diff --git a/requirements.txt b/requirements.txt
index 0820bef..5633c9b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 pydicom
 numpy
-opencv-python
+opencv-python>=4.0.0
 dataclasses
\ No newline at end of file
diff --git a/setup.py b/setup.py
index cb48721..5d525ed 100644
--- a/setup.py
+++ b/setup.py
@@ -23,11 +23,9 @@
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Typing :: Typed",
         "License :: OSI Approved :: MIT License",
@@ -41,6 +39,6 @@
         "Intended Audience :: Science/Research",
         "Intended Audience :: Developers",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     install_requires=required,
 )