diff --git a/README.md b/README.md
index 7cf46b80b..2ab5363e0 100644
--- a/README.md
+++ b/README.md
@@ -279,6 +279,7 @@ To install `yfinance` using `conda`, see
 -   [requests](http://docs.python-requests.org/en/master/) \>= 2.26
 -   [lxml](https://pypi.org/project/lxml/) \>= 4.9.1
 -   [appdirs](https://pypi.org/project/appdirs) \>= 1.4.4
+-   [cryptography](https://pypi.org/project/cryptography) \>=3.3.2
 
 ### Optional (if you want to use `pandas_datareader`)
 
diff --git a/meta.yaml b/meta.yaml
index 42bed9631..cd8a3b90f 100644
--- a/meta.yaml
+++ b/meta.yaml
@@ -22,6 +22,7 @@ requirements:
     - multitasking >=0.0.7
     - lxml >=4.9.1
     - appdirs >= 1.4.4
+    - cryptography >= 3.3.2
     - pip
     - python
 
@@ -32,6 +33,7 @@ requirements:
     - multitasking >=0.0.7
     - lxml >=4.9.1
     - appdirs >= 1.4.4
+    - cryptography >= 3.3.2
     - python
 
 test:
diff --git a/requirements.txt b/requirements.txt
index acea07261..ee5730119 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ requests>=2.26
 multitasking>=0.0.7
 lxml>=4.9.1
 appdirs>=1.4.4
+cryptography>=3.3.2
diff --git a/setup.py b/setup.py
index f711684f0..9799ac17d 100644
--- a/setup.py
+++ b/setup.py
@@ -63,7 +63,8 @@
     packages=find_packages(exclude=['contrib', 'docs', 'tests', 'examples']),
     install_requires=['pandas>=1.3.0', 'numpy>=1.16.5',
                       'requests>=2.26', 'multitasking>=0.0.7',
-                      'lxml>=4.9.1', 'appdirs>=1.4.4'],
+                      'lxml>=4.9.1', 'appdirs>=1.4.4'
+                      'cryptography>=3.3.2'],
     entry_points={
         'console_scripts': [
             'sample=sample:main',
diff --git a/yfinance/utils.py b/yfinance/utils.py
index b7a5e630f..7883b5524 100644
--- a/yfinance/utils.py
+++ b/yfinance/utils.py
@@ -36,6 +36,7 @@
 usePycryptodome = False  # slightly faster
 # usePycryptodome = True
 if usePycryptodome:
+    # NOTE: if decide to use 'pycryptodome', set min version to 3.6.6
     from Crypto.Cipher import AES
     from Crypto.Util.Padding import unpad
 else: