diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d665cd7..3cd66bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,8 +21,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Install package and dev dependencies
-        run: pip install -e ".[dev]"
+      - name: Install package with all dependencies
+        run: pip install -e ".[dev,analysis,viz,viz-interactive]"
 
       - name: Run tests
         run: python -m pytest tests/ -v --tb=short
diff --git a/pyproject.toml b/pyproject.toml
index 877689a..d1de699 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,7 @@ dependencies = [
     "pyshacl>=0.25",
     "owlrl>=6.0",
     "pandas>=2.0",
+    "pyyaml>=6.0",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/test_analysis.py b/tests/test_analysis.py
index 658e487..e57c1d5 100644
--- a/tests/test_analysis.py
+++ b/tests/test_analysis.py
@@ -11,7 +11,10 @@
 """
 
 import pytest
-import numpy as np
+
+np = pytest.importorskip("numpy")
+scipy = pytest.importorskip("scipy")
+
 from numpy.testing import assert_allclose
 
 from knowledgecomplex.schema import SchemaBuilder, vocab
diff --git a/tests/test_partition.py b/tests/test_partition.py
index 9be1735..ace934a 100644
--- a/tests/test_partition.py
+++ b/tests/test_partition.py
@@ -12,7 +12,10 @@
 """
 
 import pytest
-import numpy as np
+
+np = pytest.importorskip("numpy")
+scipy = pytest.importorskip("scipy")
+
 from numpy.testing import assert_allclose
 
 from knowledgecomplex.schema import SchemaBuilder, vocab
diff --git a/tests/test_stress.py b/tests/test_stress.py
index 24fe5c2..c201bbb 100644
--- a/tests/test_stress.py
+++ b/tests/test_stress.py
@@ -255,6 +255,7 @@ def test_from_function_all_same_value(self):
 class TestAnalysisEdgeCases:
 
     def test_betti_single_vertex(self):
+        pytest.importorskip("scipy")
         from knowledgecomplex.analysis import betti_numbers
         sb = SchemaBuilder(namespace="test")
         sb.add_vertex_type("N")
@@ -263,6 +264,7 @@ def test_betti_single_vertex(self):
         assert betti_numbers(kc) == [1, 0, 0]
 
     def test_betti_no_elements(self):
+        pytest.importorskip("scipy")
         from knowledgecomplex.analysis import betti_numbers
         sb = SchemaBuilder(namespace="test")
         sb.add_vertex_type("N")
@@ -270,6 +272,7 @@ def test_betti_no_elements(self):
         assert betti_numbers(kc) == [0, 0, 0]
 
     def test_boundary_matrices_vertices_only(self):
+        pytest.importorskip("scipy")
         from knowledgecomplex.analysis import boundary_matrices
         sb = SchemaBuilder(namespace="test")
         sb.add_vertex_type("N")
diff --git a/tests/test_topology.py b/tests/test_topology.py
index 2a20b8e..438a1e4 100644
--- a/tests/test_topology.py
+++ b/tests/test_topology.py
@@ -1,4 +1,4 @@
-"""
+r"""
 tests/test_topology.py
 
 Tests for topological query methods on KnowledgeComplex:
diff --git a/uv.lock b/uv.lock
index 3df45d5..3bc2200 100644
--- a/uv.lock
+++ b/uv.lock
@@ -584,6 +584,7 @@ dependencies = [
     { name = "owlrl" },
     { name = "pandas" },
     { name = "pyshacl" },
+    { name = "pyyaml" },
     { name = "rdflib" },
 ]
 
@@ -628,6 +629,7 @@ requires-dist = [
     { name = "pyshacl", specifier = ">=0.25" },
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=8.0" },
     { name = "pytest-cov", marker = "extra == 'dev'" },
+    { name = "pyyaml", specifier = ">=6.0" },
     { name = "rdflib", specifier = ">=7.0" },
     { name = "ruff", marker = "extra == 'dev'" },
     { name = "scipy", marker = "extra == 'analysis'", specifier = ">=1.10" },