diff --git a/platformio/package/manifest/schema.py b/platformio/package/manifest/schema.py
index 11d3f902..3502550a 100644
--- a/platformio/package/manifest/schema.py
+++ b/platformio/package/manifest/schema.py
@@ -149,7 +149,13 @@ class ExampleSchema(StrictSchema):
 
 class ManifestSchema(BaseSchema):
     # Required fields
-    name = fields.Str(required=True, validate=validate.Length(min=1, max=100))
+    name = fields.Str(
+        required=True,
+        validate=[
+            validate.Length(min=1, max=100),
+            validate.Regexp(r"^[^:/]+$", error="The next chars [:/] are not allowed"),
+        ],
+    )
     version = fields.Str(required=True, validate=validate.Length(min=1, max=50))
 
     # Optional fields
diff --git a/tests/package/test_manifest.py b/tests/package/test_manifest.py
index e497c0b4..73acfdaf 100644
--- a/tests/package/test_manifest.py
+++ b/tests/package/test_manifest.py
@@ -841,3 +841,7 @@ def test_broken_schemas():
                 version="1.2.3",
             )
         )
+
+    # invalid package name
+    with pytest.raises(ManifestValidationError, match=("are not allowed")):
+        ManifestSchema().load_manifest(dict(name="C/C++ :library", version="1.2.3"))