diff --git a/packages/core/src/store/state.ts b/packages/core/src/store/state.ts
index 309e8c33..2909bd7b 100644
--- a/packages/core/src/store/state.ts
+++ b/packages/core/src/store/state.ts
@@ -77,7 +77,7 @@ const defaultState = (): State => ({
 
   defaultMarkerColor: '#b1b1b7',
   connectionLineStyle: {},
-  connectionLineType: ConnectionLineType.Bezier,
+  connectionLineType: null,
   connectionLineOptions: {
     type: ConnectionLineType.Bezier,
     style: {},
diff --git a/packages/core/src/types/flow.ts b/packages/core/src/types/flow.ts
index d4a479cf..c6fdcac8 100644
--- a/packages/core/src/types/flow.ts
+++ b/packages/core/src/types/flow.ts
@@ -114,7 +114,7 @@ export interface FlowProps {
   nodeTypes?: NodeTypesObject
   connectionMode?: ConnectionMode
   /** @deprecated use {@link ConnectionLineOptions.type} */
-  connectionLineType?: ConnectionLineType
+  connectionLineType?: ConnectionLineType | null
   /** @deprecated use {@link ConnectionLineOptions.style} */
   connectionLineStyle?: CSSProperties | null
   connectionLineOptions?: ConnectionLineOptions
diff --git a/packages/core/src/types/store.ts b/packages/core/src/types/store.ts
index b7e74a6d..1e8c7b75 100644
--- a/packages/core/src/types/store.ts
+++ b/packages/core/src/types/store.ts
@@ -81,7 +81,7 @@ export interface State extends Omit<FlowOptions, 'id' | 'modelValue'> {
   connectionMode: ConnectionMode
   connectionLineOptions: ConnectionLineOptions
   /** @deprecated use {@link ConnectionLineOptions.type} */
-  connectionLineType: ConnectionLineType
+  connectionLineType: ConnectionLineType | null
   /** @deprecated use {@link ConnectionLineOptions.style} */
   connectionLineStyle: CSSProperties | null
   connectionStartHandle: StartHandle | null