diff --git a/src/postprocessing/EffectComposer.ts b/src/postprocessing/EffectComposer.ts
index 42c21ea0..30927665 100644
--- a/src/postprocessing/EffectComposer.ts
+++ b/src/postprocessing/EffectComposer.ts
@@ -195,6 +195,13 @@ class EffectComposer<TRenderTarget extends WebGLRenderTarget = WebGLRenderTarget
 
     this.setSize(this._width, this._height)
   }
+
+  public dispose() {
+    this.renderTarget1.dispose()
+    this.renderTarget2.dispose()
+
+    this.copyPass.dispose()
+  }
 }
 
 export { EffectComposer }
diff --git a/src/postprocessing/Pass.ts b/src/postprocessing/Pass.ts
index 83c756b9..c69f0c9b 100644
--- a/src/postprocessing/Pass.ts
+++ b/src/postprocessing/Pass.ts
@@ -24,6 +24,8 @@ class Pass {
   ): void {
     console.error('THREE.Pass: .render() must be implemented in derived pass.')
   }
+
+  public dispose() {}
 }
 
 // Helper for passes that need to fill the viewport with a single quad.
diff --git a/src/postprocessing/ShaderPass.ts b/src/postprocessing/ShaderPass.ts
index 48ab0588..f1bc6ed6 100644
--- a/src/postprocessing/ShaderPass.ts
+++ b/src/postprocessing/ShaderPass.ts
@@ -52,6 +52,11 @@ class ShaderPass extends Pass {
       this.fsQuad.render(renderer)
     }
   }
+
+  public dispose() {
+    this.fsQuad.dispose()
+    this.material.dispose()
+  }
 }
 
 export { ShaderPass }