diff --git a/pkg/sass-parser/lib/src/postcss.d.ts b/pkg/sass-parser/lib/src/postcss.d.ts
index 5e9bf293a..e7732caf4 100644
--- a/pkg/sass-parser/lib/src/postcss.d.ts
+++ b/pkg/sass-parser/lib/src/postcss.d.ts
@@ -4,16 +4,4 @@
 
 import * as postcss from 'postcss';
 
-declare module 'postcss' {
-  interface Container<Child extends postcss.Node = postcss.ChildNode> {
-    // We need to be able to override this and call it as a super method.
-    // TODO - postcss/postcss#1957: Remove this
-    /** @hidden */
-    normalize(
-      node: string | postcss.ChildProps | postcss.Node,
-      sample: postcss.Node | undefined
-    ): Child[];
-  }
-}
-
 export const isClean: unique symbol;
diff --git a/pkg/sass-parser/lib/src/statement/at-rule-internal.d.ts b/pkg/sass-parser/lib/src/statement/at-rule-internal.d.ts
index 0cff547e9..eacc3eefe 100644
--- a/pkg/sass-parser/lib/src/statement/at-rule-internal.d.ts
+++ b/pkg/sass-parser/lib/src/statement/at-rule-internal.d.ts
@@ -15,7 +15,7 @@ import {AtRule, ChildNode, ChildProps, Comment, Declaration, NewNode} from '.';
  * @hidden
  */
 export class _AtRule<
-  Props extends Partial<postcss.AtRuleProps>,
+  Props
 > extends postcss.AtRule {
   declare nodes: ChildNode[];
 
@@ -36,21 +36,13 @@ export class _AtRule<
   every(
     condition: (node: ChildNode, index: number, nodes: ChildNode[]) => boolean
   ): boolean;
-  index(child: ChildNode | number): number;
-  insertAfter(oldNode: ChildNode | number, newNode: NewNode): this;
-  insertBefore(oldNode: ChildNode | number, newNode: NewNode): this;
+  insertAfter(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
+  insertBefore(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
   next(): ChildNode | undefined;
   prepend(...nodes: NewNode[]): this;
   prev(): ChildNode | undefined;
-  push(child: ChildNode): this;
-  removeChild(child: ChildNode | number): this;
   replaceWith(
-    ...nodes: (
-      | postcss.Node
-      | ReadonlyArray<postcss.Node>
-      | ChildProps
-      | ReadonlyArray<ChildProps>
-    )[]
+    ...nodes: NewNode[]
   ): this;
   root(): Root;
   some(
diff --git a/pkg/sass-parser/lib/src/statement/index.ts b/pkg/sass-parser/lib/src/statement/index.ts
index 0f0b79366..4a8df7f15 100644
--- a/pkg/sass-parser/lib/src/statement/index.ts
+++ b/pkg/sass-parser/lib/src/statement/index.ts
@@ -63,7 +63,7 @@ export type ChildProps = postcss.ChildProps | RuleProps | GenericAtRuleProps;
  * @category Statement
  */
 export interface ContainerProps extends NodeProps {
-  nodes?: (postcss.Node | ChildProps)[];
+  nodes?: ReadonlyArray<postcss.Node | ChildProps>;
 }
 
 /**
@@ -71,7 +71,7 @@ export interface ContainerProps extends NodeProps {
  *
  * @category Statement
  */
-export type StatementWithChildren = postcss.Container<ChildNode> & {
+export type StatementWithChildren = postcss.Container<postcss.ChildNode> & {
   nodes: ChildNode[];
 } & Statement;
 
@@ -123,7 +123,11 @@ export type NewNode =
   | undefined;
 
 /** PostCSS's built-in normalize function. */
-const postcssNormalize = postcss.Container.prototype.normalize;
+const postcssNormalize = postcss.Container.prototype["normalize"] as (
+  nodes: postcss.NewChild,
+  sample: postcss.Node | undefined,
+  type?: 'prepend' | false
+) => postcss.ChildNode[];
 
 /**
  * A wrapper around {@link postcssNormalize} that converts the results to the
diff --git a/pkg/sass-parser/lib/src/statement/root-internal.d.ts b/pkg/sass-parser/lib/src/statement/root-internal.d.ts
index 71a9d6b07..ed79eedc9 100644
--- a/pkg/sass-parser/lib/src/statement/root-internal.d.ts
+++ b/pkg/sass-parser/lib/src/statement/root-internal.d.ts
@@ -34,21 +34,13 @@ export class _Root extends postcss.Root {
   every(
     condition: (node: ChildNode, index: number, nodes: ChildNode[]) => boolean
   ): boolean;
-  index(child: ChildNode | number): number;
-  insertAfter(oldNode: ChildNode | number, newNode: NewNode): this;
-  insertBefore(oldNode: ChildNode | number, newNode: NewNode): this;
+  insertAfter(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
+  insertBefore(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
   next(): ChildNode | undefined;
   prepend(...nodes: NewNode[]): this;
   prev(): ChildNode | undefined;
-  push(child: ChildNode): this;
-  removeChild(child: ChildNode | number): this;
   replaceWith(
-    ...nodes: (
-      | postcss.Node
-      | ReadonlyArray<postcss.Node>
-      | ChildProps
-      | ReadonlyArray<ChildProps>
-    )[]
+    ...nodes: NewNode[]
   ): this;
   root(): Root;
   some(
diff --git a/pkg/sass-parser/lib/src/statement/rule-internal.d.ts b/pkg/sass-parser/lib/src/statement/rule-internal.d.ts
index 93818ea91..262a37240 100644
--- a/pkg/sass-parser/lib/src/statement/rule-internal.d.ts
+++ b/pkg/sass-parser/lib/src/statement/rule-internal.d.ts
@@ -34,21 +34,13 @@ export class _Rule extends postcss.Rule {
   every(
     condition: (node: ChildNode, index: number, nodes: ChildNode[]) => boolean
   ): boolean;
-  index(child: ChildNode | number): number;
-  insertAfter(oldNode: ChildNode | number, newNode: NewNode): this;
-  insertBefore(oldNode: ChildNode | number, newNode: NewNode): this;
+  insertAfter(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
+  insertBefore(oldNode: postcss.ChildNode | number, newNode: NewNode): this;
   next(): ChildNode | undefined;
   prepend(...nodes: NewNode[]): this;
   prev(): ChildNode | undefined;
-  push(child: ChildNode): this;
-  removeChild(child: ChildNode | number): this;
   replaceWith(
-    ...nodes: (
-      | postcss.Node
-      | ReadonlyArray<postcss.Node>
-      | ChildProps
-      | ReadonlyArray<ChildProps>
-    )[]
+    ...nodes: NewNode[]
   ): this;
   root(): Root;
   some(