diff --git a/pyproject.toml b/pyproject.toml
index 1f58e61..4614818 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,10 @@ dependencies = [
 [project.optional-dependencies]
 charts = ["plotext>=5.2.0"]
 dashboard = [
-    "streamlit>=1.30.0",
+    # 1.60 is the floor because the dashboard passes width="stretch", the
+    # replacement for use_container_width, which older releases do not accept.
+    # Capped below 2.0 so a major release cannot silently change widget APIs.
+    "streamlit>=1.60.0,<2.0.0",
     "plotly>=5.18.0",
 ]
 dev = [
@@ -24,7 +27,10 @@ dev = [
     "pyflakes>=3.2.0",
     "respx>=0.22.0",
     # The dashboard journey tests drive the real app through streamlit's AppTest.
-    "streamlit>=1.30.0",
+    # 1.60 is the floor because the dashboard passes width="stretch", the
+    # replacement for use_container_width, which older releases do not accept.
+    # Capped below 2.0 so a major release cannot silently change widget APIs.
+    "streamlit>=1.60.0,<2.0.0",
     "plotly>=5.18.0",
     # Terminal charts are an optional feature, but one test covers what happens
     # when drawing them fails, so the test install needs them present.
diff --git a/src/perfect_choice/dashboard/views/detail.py b/src/perfect_choice/dashboard/views/detail.py
index a48cd49..90fa6fd 100644
--- a/src/perfect_choice/dashboard/views/detail.py
+++ b/src/perfect_choice/dashboard/views/detail.py
@@ -73,7 +73,7 @@ def render() -> None:
                 yaxis=dict(autorange="reversed"),
                 height=max(250, len(decision.criteria) * 45),
             )
-            st.plotly_chart(fig_weights, use_container_width=True)
+            st.plotly_chart(fig_weights, width="stretch")
         else:
             st.info("No criteria defined.")
 
@@ -99,7 +99,7 @@ def render() -> None:
                 yaxis_title="Score",
                 height=350,
             )
-            st.plotly_chart(fig_rank, use_container_width=True)
+            st.plotly_chart(fig_rank, width="stretch")
         else:
             st.info("No rankings computed.")
 
@@ -119,7 +119,7 @@ def render() -> None:
         # Reorder columns by criteria order
         col_order = [c.name for c in decision.criteria if c.name in df.columns]
         df = df[col_order]
-        st.dataframe(df, use_container_width=True)
+        st.dataframe(df, width="stretch")
     else:
         st.info("No scores recorded.")
 
@@ -217,4 +217,4 @@ def _render_sensitivity_chart(decision) -> None:
         yaxis=dict(autorange="reversed"),
         height=max(250, len(names) * 45),
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")
diff --git a/src/perfect_choice/dashboard/views/new_decision.py b/src/perfect_choice/dashboard/views/new_decision.py
index abffbd8..52c4795 100644
--- a/src/perfect_choice/dashboard/views/new_decision.py
+++ b/src/perfect_choice/dashboard/views/new_decision.py
@@ -588,7 +588,7 @@ def _render_ranking_chart(rankings: dict[str, list[RankingResult]]) -> None:
         yaxis_title="Score",
         xaxis_title="Alternative",
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")
 
 
 def _render_weight_donut(criteria: list[Criterion]) -> None:
@@ -624,7 +624,7 @@ def _render_weight_donut(criteria: list[Criterion]) -> None:
         **PLOTLY_LAYOUT,
         title="Criteria Weights",
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")
 
 
 def _render_sensitivity_chart(sensitivity: list) -> None:
@@ -666,7 +666,7 @@ def _render_sensitivity_chart(sensitivity: list) -> None:
         xaxis_title="Weight Perturbation (%)",
         yaxis=dict(autorange="reversed"),
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")
 
 
 # ---------------------------------------------------------------------------
diff --git a/src/perfect_choice/dashboard/views/replay.py b/src/perfect_choice/dashboard/views/replay.py
index 42fb90f..7d85e58 100644
--- a/src/perfect_choice/dashboard/views/replay.py
+++ b/src/perfect_choice/dashboard/views/replay.py
@@ -195,7 +195,7 @@ def _run_comparison(decision, new_criteria):
         yaxis_title="Weight (%)",
         height=350,
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")
 
 
 def _render_ranking_chart(rankings, label):
@@ -223,4 +223,4 @@ def _render_ranking_chart(rankings, label):
         yaxis_title="Score",
         height=300,
     )
-    st.plotly_chart(fig, use_container_width=True)
+    st.plotly_chart(fig, width="stretch")