diff --git a/Pipfile b/Pipfile
index ec3dbb1..28699aa 100644
--- a/Pipfile
+++ b/Pipfile
@@ -5,9 +5,9 @@ name = "pypi"
 
 [packages]
 fastcore = "==1.5.27"
-numpy = ">=1.21.6"
+numpy = "==1.21.6"
 matplotlib = "==3.5"
-opencv-python = ">=4.0"
+opencv-python = "==4.7.0.72" # https://github.com/opencv/opencv-python/issues/885
 
 [dev-packages] 
 build = "==0.7"
diff --git a/Pipfile.lock b/Pipfile.lock
index dc0baf6..283d499 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "3e58450ae955d5f8ea2ddaf3cae1d3a4e16863994f1da73cb04f0bfbeae8dec2"
+            "sha256": "b4838cbd2c41b8d3f5b5c922cbfc92bc6e27fcecebeb058b7716a3c7227bbd99"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -202,16 +202,16 @@
         },
         "opencv-python": {
             "hashes": [
-                "sha256:48eb3121d809a873086d6677565e3ac963e6946110d13cd115533fa70e2aa2eb",
-                "sha256:56d84c43ce800938b9b1ec74b33942b2edbcef3f70c2754eb9bfe5dff1ee3ace",
-                "sha256:67bce4b9aad307c98a9a07c6afb7de3a4e823c1f4991d6d8e88e229e7dfeee59",
-                "sha256:93871871b1c9d6b125cddd45b0638a2fa01ee9fd37f5e428823f750e404f2f15",
-                "sha256:9bcb4944211acf13742dbfd9d3a11dc4e36353ffa1746f2c7dcd6a01c32d1376",
-                "sha256:b2349dc9f97ed6c9ba163d0a7a24bcef9695a3e216cd143e92f1b9659c5d9a49",
-                "sha256:ba32cfa75a806abd68249699d34420737d27b5678553387fc5768747a6492147"
+                "sha256:3424794a711f33284581f3c1e4b071cfc827d02b99d6fd9a35391f517c453306",
+                "sha256:7a297e7651e22eb17c265ddbbc80e2ba2a8ff4f4a1696a67c45e5f5798245842",
+                "sha256:812af57553ec1c6709060c63f6b7e9ad07ddc0f592f3ccc6d00c71e0fe0e6376",
+                "sha256:cd08343654c6b88c5a8c25bf425f8025aed2e3189b4d7306b5861d32affaf737",
+                "sha256:d4f8880440c433a0025d78804dda6901d1e8e541a561dda66892d90290aef881",
+                "sha256:ebfc0a3a2f57716e709028b992e4de7fd8752105d7a768531c4f434043c6f9ff",
+                "sha256:eda115797b114fc16ca6f182b91c5d984f0015c19bec3145e55d33d708e9bae1"
             ],
             "index": "pypi",
-            "version": "==4.8.0.76"
+            "version": "==4.7.0.72"
         },
         "packaging": {
             "hashes": [
@@ -611,11 +611,11 @@
         },
         "click": {
             "hashes": [
-                "sha256:48ee849951919527a045bfe3bf7baa8a959c423134e1a5b98c05c20ba75a1cbd",
-                "sha256:fa244bb30b3b5ee2cae3da8f55c9e5e0c0e86093306301fb418eb9dc40fbded5"
+                "sha256:ae74fb96c20a0277a1d615f1e4d73c8414f5a98db8b799a7931d1582f3390c28",
+                "sha256:ca9853ad459e787e2192211578cc907e7594e294c7ccc834310722b41b9ca6de"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==8.1.6"
+            "version": "==8.1.7"
         },
         "colorama": {
             "hashes": [
@@ -1071,16 +1071,16 @@
         },
         "opencv-python": {
             "hashes": [
-                "sha256:48eb3121d809a873086d6677565e3ac963e6946110d13cd115533fa70e2aa2eb",
-                "sha256:56d84c43ce800938b9b1ec74b33942b2edbcef3f70c2754eb9bfe5dff1ee3ace",
-                "sha256:67bce4b9aad307c98a9a07c6afb7de3a4e823c1f4991d6d8e88e229e7dfeee59",
-                "sha256:93871871b1c9d6b125cddd45b0638a2fa01ee9fd37f5e428823f750e404f2f15",
-                "sha256:9bcb4944211acf13742dbfd9d3a11dc4e36353ffa1746f2c7dcd6a01c32d1376",
-                "sha256:b2349dc9f97ed6c9ba163d0a7a24bcef9695a3e216cd143e92f1b9659c5d9a49",
-                "sha256:ba32cfa75a806abd68249699d34420737d27b5678553387fc5768747a6492147"
+                "sha256:3424794a711f33284581f3c1e4b071cfc827d02b99d6fd9a35391f517c453306",
+                "sha256:7a297e7651e22eb17c265ddbbc80e2ba2a8ff4f4a1696a67c45e5f5798245842",
+                "sha256:812af57553ec1c6709060c63f6b7e9ad07ddc0f592f3ccc6d00c71e0fe0e6376",
+                "sha256:cd08343654c6b88c5a8c25bf425f8025aed2e3189b4d7306b5861d32affaf737",
+                "sha256:d4f8880440c433a0025d78804dda6901d1e8e541a561dda66892d90290aef881",
+                "sha256:ebfc0a3a2f57716e709028b992e4de7fd8752105d7a768531c4f434043c6f9ff",
+                "sha256:eda115797b114fc16ca6f182b91c5d984f0015c19bec3145e55d33d708e9bae1"
             ],
             "index": "pypi",
-            "version": "==4.8.0.76"
+            "version": "==4.7.0.72"
         },
         "packaging": {
             "hashes": [
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index f1359f5..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,97 +0,0 @@
-asttokens==2.2.1
-astunparse==1.6.3
-attrs==23.1.0
-backcall==0.2.0
-black==23.3.0
-bleach==6.0.0
-build==0.7
-certifi==2023.7.22
-cffi==1.15.1
-cfgv==3.3.1
-charset-normalizer==3.2.0
-click==8.1.6
-colorama==0.4.6
-cryptography==41.0.3
-cycler==0.11.0
-debugpy==1.6.7.post1
-decorator==5.1.1
-distlib==0.3.7
-docutils==0.20.1
-entrypoints==0.4
-execnb==0.1.5
-fastcore==1.5.27
-filelock==3.12.2
-flake8==5.0.4
-fonttools==4.38.0
-ghapi==1.0.4
-identify==2.5.24
-idna==3.4
-importlib-metadata==6.7.0
-iniconfig==2.0.0
-ipykernel==6.12.0
-ipython==7.34.0
-jaraco.classes==3.2.3
-jedi==0.19.0
-jeepney==0.8.0
-jupyter-client==7.4.9
-jupyter-core==4.12.0
-keyring==23.9.3
-kiwisolver==1.4.4
-matplotlib==3.5
-matplotlib-inline==0.1.6
-mccabe==0.7.0
-more-itertools==9.1.0
-mypy-extensions==1.0.0
-nbdev==2.3.12
-nest-asyncio==1.5.7
-nodeenv==1.8.0
-numpy==1.21.6
-opencv-python==4.8.0.76
-packaging==23.1
-parso==0.8.3
-pathspec==0.11.2
-pep517==0.13.0
-pexpect==4.8.0
-pickleshare==0.7.5
-pillow==9.5.0
-pip==23.2.1
-pkginfo==1.9.6
-platformdirs==2.6.2
-pluggy==1.2.0
-pre-commit==2.21.0
-prompt-toolkit==3.0.39
-psutil==5.9.5
-ptyprocess==0.7.0
-py==1.11.0
-pycodestyle==2.9.1
-pycparser==2.21
-pyflakes==2.5.0
-pygments==2.16.1
-pyparsing==3.1.1
-pytest==7.1.1
-python-build==0.2.13
-python-dateutil==2.8.2
-pyyaml==6.0.1
-pyzmq==25.1.1
-readme-renderer==37.3
-requests==2.31.0
-requests-toolbelt==1.0.0
-rfc3986==2.0.0
-secretstorage==3.3.3
-setuptools==68.0.0
-setuptools-scm==7.1.0
-six==1.16.0
-tomli==2.0.1
-tornado==6.2
-tqdm==4.66.1
-traitlets==5.9.0
-twine==3.7
-typed-ast==1.5.5
-typing-extensions==4.7.1
-urllib3==2.0.4
-virtualenv==20.16.2
-watchdog==3.0.0
-wcwidth==0.2.6
-webencodings==0.5.1
-wheel==0.41.1
-zipp==3.15.0
diff --git a/settings.ini b/settings.ini
index 3746c09..d4b0ba1 100644
--- a/settings.ini
+++ b/settings.ini
@@ -39,6 +39,6 @@ user = thatgeeman
 black_formatting = True
 
 ### Optional ###
-requirements = fastcore>=1.5.27 numpy>=1.21.6 matplotlib>=3.5 opencv-python>=4.0
+requirements = fastcore>=1.5.27 numpy==1.21.6 matplotlib>=3.5 opencv-python==4.7.0.72
 dev_requirements = build twine ipykernel pytest python-build nbdev pre-commit
 # console_scripts =