diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index da3c14c..3c266de 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -21,7 +21,7 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
         python -m pip install coverage
-        python -m pip install -r requirements.txt
+        python -m pip install -r test-requirements.txt
         coverage run --source='.' --parallel -m pytest 
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v1
diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index fb2ccd3..4ce9c11 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -29,7 +29,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
-        python -m pip install -r requirements.txt
+        python -m pip install -r test-requirements.txt
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
diff --git a/graph/visuals.py b/graph/visuals.py
index 7ddcb34..05bf0fe 100644
--- a/graph/visuals.py
+++ b/graph/visuals.py
@@ -5,6 +5,8 @@
     visuals_enabled = True
 except ImportError:
     visuals_enabled = False
+    import warnings
+    warnings.warn("matplotlib is not installed, visuals are disabled. Please install matplotlib>=3.1.0")
 
 
 def visualise(func):
diff --git a/requirements.txt b/requirements.txt
index beadd09..e69de29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +0,0 @@
-matplotlib >= 3.1
\ No newline at end of file
diff --git a/test-requirements.txt b/test-requirements.txt
new file mode 100644
index 0000000..beadd09
--- /dev/null
+++ b/test-requirements.txt
@@ -0,0 +1 @@
+matplotlib >= 3.1
\ No newline at end of file