diff --git a/package.json b/package.json
index 7b6cfd7..0ebe1ae 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "test": "vitest"
   },
   "dependencies": {
-    "content-tag": "^3.1.2",
+    "content-tag": "^4.2.0",
     "jscodeshift": "^17.2.0"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 71c2459..8fc31e7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -9,8 +9,8 @@ importers:
   .:
     dependencies:
       content-tag:
-        specifier: ^3.1.2
-        version: 3.1.2
+        specifier: ^4.2.0
+        version: 4.2.0
       jscodeshift:
         specifier: ^17.2.0
         version: 17.2.0
@@ -851,8 +851,8 @@ packages:
   config-chain@1.1.13:
     resolution: {integrity: sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==}
 
-  content-tag@3.1.2:
-    resolution: {integrity: sha512-Z+MGhZfnFFKzYC+pUTWXnoDYhfiXP9ojZe3JbwsYufmDuoeq2EvuDyeFAJ/RnKokUwz5s9bQhDOrbvSYRShcrQ==}
+  content-tag@4.2.0:
+    resolution: {integrity: sha512-f/o+F3qSa4gg23I7RWy6cMDxP2nPo99YWusxw2bjne7ZC6Acqqf4uB/+87AekOq1ehTocHH7b7nMd2X4S3NHVw==}
 
   convert-source-map@2.0.0:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
@@ -2755,7 +2755,7 @@ snapshots:
       ini: 1.3.8
       proto-list: 1.2.4
 
-  content-tag@3.1.2: {}
+  content-tag@4.2.0: {}
 
   convert-source-map@2.0.0: {}
 
diff --git a/src/coordinates-of.js b/src/coordinates-of.js
index 231fa51..f125948 100644
--- a/src/coordinates-of.js
+++ b/src/coordinates-of.js
@@ -24,9 +24,9 @@ export function coordinatesOf(source, parsedResult) {
 
   let { contentRange: byteRange } = parsedResult;
   let inclusiveContent = buffer
-    .slice(byteRange.start, byteRange.end)
+    .slice(byteRange.startByte, byteRange.endByte)
     .toString();
-  let beforeContent = buffer.slice(0, byteRange.start).toString();
+  let beforeContent = buffer.slice(0, byteRange.startByte).toString();
   let before = beforeContent.length;
 
   let startCharIndex = before;
diff --git a/src/internal-types.ts b/src/internal-types.ts
index 3dd1799..aa788af 100644
--- a/src/internal-types.ts
+++ b/src/internal-types.ts
@@ -7,11 +7,11 @@ export interface ContentRangeResult {
     /**
      * The start byte index of the content-range
      */
-    start: number;
+    startByte: number;
     /**
      * The end byte index of the content-range
      */
-    end: number;
+    endByte: number;
   };
 }
 
diff --git a/src/transformer.js b/src/transformer.js
index 7bdd1fc..05ff87e 100644
--- a/src/transformer.js
+++ b/src/transformer.js
@@ -414,7 +414,7 @@ export class ParseResultStringUtils {
    * @param {ParseResult} parseResult
    */
   contentBefore(parseResult) {
-    return this.#buffer.slice(0, parseResult.range.start).toString();
+    return this.#buffer.slice(0, parseResult.range.startByte).toString();
   }
 
   /**
@@ -422,7 +422,10 @@ export class ParseResultStringUtils {
    */
   originalContentOf(parseResult) {
     return this.#buffer
-      .slice(parseResult.contentRange.start, parseResult.contentRange.end)
+      .slice(
+        parseResult.contentRange.startByte,
+        parseResult.contentRange.endByte,
+      )
       .toString();
   }
 
@@ -442,7 +445,7 @@ export class ParseResultStringUtils {
    */
   openingTag(parseResult) {
     let openingTag = this.#buffer
-      .slice(parseResult.startRange.start, parseResult.startRange.end)
+      .slice(parseResult.startRange.startByte, parseResult.startRange.endByte)
       .toString();
     return openingTag;
   }
@@ -452,7 +455,7 @@ export class ParseResultStringUtils {
    */
   closingTag(parseResult) {
     let closingTag = this.#buffer
-      .slice(parseResult.endRange.start, parseResult.endRange.end)
+      .slice(parseResult.endRange.startByte, parseResult.endRange.endByte)
       .toString();
     return closingTag;
   }
diff --git a/tests/transformer.parseResultAt.test.ts b/tests/transformer.parseResultAt.test.ts
index f7d0f5f..1a3091f 100644
--- a/tests/transformer.parseResultAt.test.ts
+++ b/tests/transformer.parseResultAt.test.ts
@@ -31,19 +31,19 @@ for (let scenario of coords) {
   it(`matches start ${scenario.start}`, () => {
     const result = t.parseResultAt({ start: scenario.start });
 
-    expect(result?.contentRange?.start).toEqual(scenario.start);
+    expect(result?.contentRange?.startByte).toEqual(scenario.start);
   });
 
   it(`matches end ${scenario.end}`, () => {
     const result = t.parseResultAt({ end: scenario.end });
 
-    expect(result?.contentRange?.end).toEqual(scenario.end);
+    expect(result?.contentRange?.endByte).toEqual(scenario.end);
   });
 
   it(`matches whole thing ${scenario.start}`, () => {
     const result = t.parseResultAt(scenario);
 
-    expect(result?.contentRange?.end).toEqual(scenario.end);
+    expect(result?.contentRange?.endByte).toEqual(scenario.end);
   });
 
   it(`matches line and column ${scenario.line} ${scenario.column}`, () => {
@@ -52,6 +52,6 @@ for (let scenario of coords) {
       column: scenario.column,
     });
 
-    expect(result?.contentRange?.end).toEqual(scenario.end);
+    expect(result?.contentRange?.endByte).toEqual(scenario.end);
   });
 }
diff --git a/tests/unprocess.test.ts b/tests/unprocess.test.ts
index 384b6fd..e74f080 100644
--- a/tests/unprocess.test.ts
+++ b/tests/unprocess.test.ts
@@ -11,8 +11,14 @@ import { Preprocessor } from "content-tag";
 
 let p = new Preprocessor();
 
+/**
+ * content-tag's process strips the whitespace around template contents,
+ * so a round-trip cannot restore newlines next to the template tags.
+ */
 function normalizeCode(input: string) {
   return input
+    .replaceAll("<template>", "\n<template>\n")
+    .replaceAll("</template>", "\n</template>\n")
     .split("\n")
     .map((x) => x.trim())
     .filter(Boolean);
@@ -79,8 +85,7 @@ it("implicitDefault.js", async () => {
 it("unicodeSingle", () => {
   let result = doUndo(unicodeSingle);
 
-  // @ts-expect-error - how do types for this work
-  expect(result).toMatchObject(unicodeSingle);
+  expect(result).toMatchCode(unicodeSingle);
 });
 
 it("unicodeMulti", () => {