diff --git a/src/conda_devenv/devenv.py b/src/conda_devenv/devenv.py
index 2f6e18d..496ba49 100644
--- a/src/conda_devenv/devenv.py
+++ b/src/conda_devenv/devenv.py
@@ -348,7 +348,7 @@ def process_constraints_into_dependencies(yaml_dict: YAMLData) -> None:
         return
 
     dependency_names = {
-        PackageSpecifier.parse(dep).name for dep in yaml_dict["dependencies"]
+        PackageSpecifier.parse(dep).name for dep in yaml_dict["dependencies"] if isinstance(dep, str)
     }
 
     added_dependencies = [
diff --git a/tests/test_load_yaml_dict.py b/tests/test_load_yaml_dict.py
index 044ac32..6bd5f97 100644
--- a/tests/test_load_yaml_dict.py
+++ b/tests/test_load_yaml_dict.py
@@ -16,6 +16,12 @@ def test_load_yaml_dict(datadir) -> None:
     assert set(environment["PATH"]) == {"b_path", "a_path"}
 
 
+def test_load_yaml_dict_with_pip(datadir) -> None:
+    conda_yaml_dict = load_yaml_dict(datadir / "d.yml")
+    dependencies = conda_yaml_dict["dependencies"]
+    assert dependencies == ['a_dependency', {'pip': ['d_dependency']}]
+
+
 def test_load_yaml_dict_with_wrong_definition_at_environment_key(datadir) -> None:
     filename = datadir / "a_wrong_definition_at_environment.yml"
     with pytest.raises(ValueError) as e:
@@ -250,6 +256,24 @@ def test_constraints_respected(self) -> None:
             "attrs >=20",
         ]
 
+    def test_constraints_respected_with_pip(self) -> None:
+        """
+        Constraints are declared as dependency if they are explicitly declared.
+        """
+        data = {
+            "dependencies": ["attrs >19", "boltons", "pytest>=6", {"pip": ["lupa >= 1.14"]}],
+            "constraints": ["pytest >7", "attrs >=20", "requests <2"],
+        }
+        process_constraints_into_dependencies(data)
+        assert data["dependencies"] == [
+            "attrs >19",
+            "boltons",
+            "pytest>=6",
+            {'pip': ['lupa >= 1.14']},
+            "pytest >7",
+            "attrs >=20",
+        ]
+
     def test_integration(self, tmp_path: Path) -> None:
         utils_fn = tmp_path / "common-utils.devenv.yml"
         utils_fn.write_text(
diff --git a/tests/test_load_yaml_dict/d.yml b/tests/test_load_yaml_dict/d.yml
new file mode 100644
index 0000000..ae614f9
--- /dev/null
+++ b/tests/test_load_yaml_dict/d.yml
@@ -0,0 +1,8 @@
+name: d
+dependencies:
+  - a_dependency
+  - pip:
+    - d_dependency
+environment:
+  PATH:
+    - a_path
diff --git a/tests/test_locking.py b/tests/test_locking.py
index f83255f..6f6f02a 100644
--- a/tests/test_locking.py
+++ b/tests/test_locking.py
@@ -32,6 +32,8 @@ def test_create_and_update_lock_files(
             - pytest
             - wincom  # [win]
             - shmem  # [unix]
+            - pip:
+              - lupa
             """
         )
     )
diff --git a/tests/test_locking/expected.linux-64.lock_environment.yml b/tests/test_locking/expected.linux-64.lock_environment.yml
index dc2c9b2..fbaf9d4 100644
--- a/tests/test_locking/expected.linux-64.lock_environment.yml
+++ b/tests/test_locking/expected.linux-64.lock_environment.yml
@@ -6,6 +6,8 @@ dependencies:
 - flock
 - pytest
 - shmem
+- pip:
+  - lupa
 environment: {}
 name: foo-py310
 platforms:
diff --git a/tests/test_locking/expected.win-64.lock_environment.yml b/tests/test_locking/expected.win-64.lock_environment.yml
index ad90bf4..ee247ad 100644
--- a/tests/test_locking/expected.win-64.lock_environment.yml
+++ b/tests/test_locking/expected.win-64.lock_environment.yml
@@ -6,6 +6,8 @@ dependencies:
 - pytest
 - pywin32
 - wincom
+- pip:
+  - lupa
 environment: {}
 name: foo-py310
 platforms: