diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8681323..c72ddc8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
 
       - name: install dependencies
         run: |
-          pip install -r requirements
+          pip install -r requirements.freeze
           pip install --upgrade coveralls
 
       - name: test
diff --git a/requirements b/requirements
index f34701b..ce4a634 100644
--- a/requirements
+++ b/requirements
@@ -1,4 +1,4 @@
-bitstring
+bitstring==3.1.9
 colour-science
 docopt
 imagehash
diff --git a/requirements.freeze b/requirements.freeze
new file mode 100644
index 0000000..b7df39e
--- /dev/null
+++ b/requirements.freeze
@@ -0,0 +1,14 @@
+bitstring==3.1.9
+colour-science==0.4.1
+docopt==0.6.2
+ImageHash==4.3.1
+imageio==2.34.0
+numpy==1.24.4
+opencv-python==4.9.0.80
+pillow==10.2.0
+PyWavelets==1.4.1
+pywirehair==0.1.0
+reedsolo==1.7.0
+scipy==1.10.1
+typing-extensions==4.9.0
+zstandard==0.22.0