diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 49869687a..e6d0c9fbe 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -1386,7 +1386,7 @@ interface Keyframe {
     composite?: CompositeOperationOrAuto;
     easing?: string;
     offset?: number | null;
-    [property: string]: string | number | null | undefined;
+    [property: string]: string | number | null | undefined | CSSStyleValue;
 }
 
 interface KeyframeAnimationOptions extends KeyframeEffectOptions {
diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
index c2605d732..dda7d8efb 100644
--- a/baselines/ts5.5/dom.generated.d.ts
+++ b/baselines/ts5.5/dom.generated.d.ts
@@ -1383,7 +1383,7 @@ interface Keyframe {
     composite?: CompositeOperationOrAuto;
     easing?: string;
     offset?: number | null;
-    [property: string]: string | number | null | undefined;
+    [property: string]: string | number | null | undefined | CSSStyleValue;
 }
 
 interface KeyframeAnimationOptions extends KeyframeEffectOptions {
diff --git a/baselines/ts5.6/dom.generated.d.ts b/baselines/ts5.6/dom.generated.d.ts
index 080755c34..7ca7c3bf3 100644
--- a/baselines/ts5.6/dom.generated.d.ts
+++ b/baselines/ts5.6/dom.generated.d.ts
@@ -1383,7 +1383,7 @@ interface Keyframe {
     composite?: CompositeOperationOrAuto;
     easing?: string;
     offset?: number | null;
-    [property: string]: string | number | null | undefined;
+    [property: string]: string | number | null | undefined | CSSStyleValue;
 }
 
 interface KeyframeAnimationOptions extends KeyframeEffectOptions {
diff --git a/baselines/ts5.9/dom.generated.d.ts b/baselines/ts5.9/dom.generated.d.ts
index e7d397376..1fafda75c 100644
--- a/baselines/ts5.9/dom.generated.d.ts
+++ b/baselines/ts5.9/dom.generated.d.ts
@@ -1383,7 +1383,7 @@ interface Keyframe {
     composite?: CompositeOperationOrAuto;
     easing?: string;
     offset?: number | null;
-    [property: string]: string | number | null | undefined;
+    [property: string]: string | number | null | undefined | CSSStyleValue;
 }
 
 interface KeyframeAnimationOptions extends KeyframeEffectOptions {
diff --git a/inputfiles/overridingTypes.jsonc b/inputfiles/overridingTypes.jsonc
index c6e2832d5..88e145ab2 100644
--- a/inputfiles/overridingTypes.jsonc
+++ b/inputfiles/overridingTypes.jsonc
@@ -2923,7 +2923,7 @@
             "BaseKeyframe": {
                 "name": "Keyframe",
                 "overrideIndexSignatures": [
-                    "[property: string]: string | number | null | undefined"
+                    "[property: string]: string | number | null | undefined | CSSStyleValue"
                 ]
             },
             "BasePropertyIndexedKeyframe": {