diff --git a/autotests/integration/effects/scripted_effects_test.cpp b/autotests/integration/effects/scripted_effects_test.cpp
--- a/autotests/integration/effects/scripted_effects_test.cpp
+++ b/autotests/integration/effects/scripted_effects_test.cpp
@@ -306,7 +306,7 @@
         QCOMPARE(animationsForWindow[0].timeLine.duration(), 100ms);
         QCOMPARE(animationsForWindow[0].to, FPx2(1.4));
         QCOMPARE(animationsForWindow[0].attribute, AnimationEffect::Scale);
-        QCOMPARE(animationsForWindow[0].timeLine.easingCurve().type(), QEasingCurve::OutQuad);
+        QCOMPARE(animationsForWindow[0].timeLine.easingCurve().type(), QEasingCurve::OutCubic);
         QCOMPARE(animationsForWindow[0].terminationFlags,
                  AnimationEffect::TerminateAtSource | AnimationEffect::TerminateAtTarget);
 
diff --git a/autotests/integration/effects/scripts/animationTest.js b/autotests/integration/effects/scripts/animationTest.js
--- a/autotests/integration/effects/scripts/animationTest.js
+++ b/autotests/integration/effects/scripts/animationTest.js
@@ -1,5 +1,5 @@
 effects.windowAdded.connect(function(w) {
-    w.anim1 = effect.animate(w, Effect.Scale, 100, 1.4, 0.2, 0, QEasingCurve.OutQuad);
+    w.anim1 = effect.animate(w, Effect.Scale, 100, 1.4, 0.2, 0, QEasingCurve.OutCubic);
     sendTestResponse(typeof(w.anim1) == "number");
 });
 
diff --git a/autotests/integration/effects/scripts/animationTestMulti.js b/autotests/integration/effects/scripts/animationTestMulti.js
--- a/autotests/integration/effects/scripts/animationTestMulti.js
+++ b/autotests/integration/effects/scripts/animationTestMulti.js
@@ -5,10 +5,10 @@
         animations: [{
             type: Effect.Scale,
             to: 1.4,
-            curve: QEasingCurve.OutQuad
+            curve: QEasingCurve.OutCubic
         }, {
             type: Effect.Opacity,
-            curve: QEasingCurve.OutQuad,
+            curve: QEasingCurve.OutCubic,
             to: 0.0
         }]
     });
diff --git a/effects/slidingpopups/slidingpopups.cpp b/effects/slidingpopups/slidingpopups.cpp
--- a/effects/slidingpopups/slidingpopups.cpp
+++ b/effects/slidingpopups/slidingpopups.cpp
@@ -464,7 +464,7 @@
     animation.kind = AnimationKind::In;
     animation.timeLine.setDirection(TimeLine::Forward);
     animation.timeLine.setDuration((*dataIt).slideInDuration);
-    animation.timeLine.setEasingCurve(QEasingCurve::OutQuad);
+    animation.timeLine.setEasingCurve(QEasingCurve::OutCubic);
 
     // If the opposite animation (Out) was active and it had shorter duration,
     // at this point, the timeline can end up in the "done" state. Thus, we have
@@ -503,8 +503,8 @@
     animation.kind = AnimationKind::Out;
     animation.timeLine.setDirection(TimeLine::Backward);
     animation.timeLine.setDuration((*dataIt).slideOutDuration);
-    // this is effectively InQuad because the direction is reversed
-    animation.timeLine.setEasingCurve(QEasingCurve::OutQuad);
+    // this is effectively InCubic because the direction is reversed
+    animation.timeLine.setEasingCurve(QEasingCurve::OutCubic);
 
     // If the opposite animation (In) was active and it had shorter duration,
     // at this point, the timeline can end up in the "done" state. Thus, we have
diff --git a/effects/windowaperture/package/contents/code/main.js b/effects/windowaperture/package/contents/code/main.js
--- a/effects/windowaperture/package/contents/code/main.js
+++ b/effects/windowaperture/package/contents/code/main.js
@@ -162,7 +162,7 @@
                 w.offToCornerId = set({
                     window: w,
                     duration: badBadWindowsEffect.duration,
-                    curve: QEasingCurve.InOutQuad,
+                    curve: QEasingCurve.InOutCubic,
                     animations: [{
                         type: Effect.Position,
                         targetAnchor: anchor,
@@ -180,7 +180,7 @@
                     animate({
                         window: w,
                         duration: badBadWindowsEffect.duration,
-                        curve: QEasingCurve.InOutQuad,
+                        curve: QEasingCurve.InOutCubic,
                         animations: [{
                             type: Effect.Position,
                             sourceAnchor: anchor,
diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -3684,7 +3684,7 @@
     /**
      * Sets new easing curve by providing its type.
      *
-     * @param type Type of the easing curve(e.g. QEasingCurve::InQuad, etc)
+     * @param type Type of the easing curve(e.g. QEasingCurve::InCubic, etc)
      * @see easingCurve
      * @since 5.14
      */
diff --git a/onscreennotification.cpp b/onscreennotification.cpp
--- a/onscreennotification.cpp
+++ b/onscreennotification.cpp
@@ -210,7 +210,7 @@
             m_animation->setStartValue(1.0);
             m_animation->setEndValue(0.0);
             m_animation->setDuration(250);
-            m_animation->setEasingCurve(QEasingCurve::InOutQuad);
+            m_animation->setEasingCurve(QEasingCurve::InOutCubic);
         }
     }
 }
diff --git a/qml/outline/plasma/outline.qml b/qml/outline/plasma/outline.qml
--- a/qml/outline/plasma/outline.qml
+++ b/qml/outline/plasma/outline.qml
@@ -116,19 +116,19 @@
         }
 
         Behavior on x {
-            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutQuad; }
+            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutCubic; }
             enabled: window.animationEnabled
         }
         Behavior on y {
-            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutQuad; }
+            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutCubic; }
             enabled: window.animationEnabled
         }
         Behavior on width {
-            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutQuad; }
+            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutCubic; }
             enabled: window.animationEnabled
         }
         Behavior on height {
-            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutQuad; }
+            NumberAnimation { duration: window.animationDuration; easing.type: Easing.InOutCubic; }
             enabled: window.animationEnabled
         }
     }