diff --git a/DashAI/back/exploration/explorers/density_heatmap.py b/DashAI/back/exploration/explorers/density_heatmap.py
index ce6d22605..a62b51964 100644
--- a/DashAI/back/exploration/explorers/density_heatmap.py
+++ b/DashAI/back/exploration/explorers/density_heatmap.py
@@ -5,6 +5,8 @@
 from DashAI.back.dependencies.database.models import Explorer, Notebook
 from DashAI.back.exploration.base_explorer import BaseExplorerSchema
 from DashAI.back.exploration.relationship_explorer import RelationshipExplorer
+from DashAI.back.types.categorical import Categorical
+from DashAI.back.types.value_types import Float, Integer
 
 if TYPE_CHECKING:
     from pathlib import Path
@@ -99,7 +101,7 @@ class DensityHeatmapExplorer(RelationshipExplorer):
 
     SCHEMA = DensityHeatmapSchema
     metadata: Dict[str, Any] = {
-        "allowed_types": [],
+        "allowed_types": [Float, Integer, Categorical],
         "allowed_dtypes": [],
         "input_cardinality": {"exact": 2},
     }
diff --git a/DashAI/back/exploration/explorers/histogram_plot.py b/DashAI/back/exploration/explorers/histogram_plot.py
index 987a8bcf3..601ca6097 100644
--- a/DashAI/back/exploration/explorers/histogram_plot.py
+++ b/DashAI/back/exploration/explorers/histogram_plot.py
@@ -13,6 +13,8 @@
 from DashAI.back.dependencies.database.models import Explorer, Notebook
 from DashAI.back.exploration.base_explorer import BaseExplorerSchema
 from DashAI.back.exploration.distribution_explorer import DistributionExplorer
+from DashAI.back.types.categorical import Categorical
+from DashAI.back.types.value_types import Float, Integer
 
 if TYPE_CHECKING:
     from pathlib import Path
@@ -183,7 +185,7 @@ class HistogramPlotExplorer(DistributionExplorer):
 
     SCHEMA = HistogramPlotSchema
     metadata: Dict[str, Any] = {
-        "allowed_types": [],
+        "allowed_types": [Float, Integer, Categorical],
         "allowed_dtypes": [],
         "input_cardinality": {"exact": 1},
     }