diff --git a/dist/restore/index.js b/dist/restore/index.js
index ef32a83..aaa23a8 100644
--- a/dist/restore/index.js
+++ b/dist/restore/index.js
@@ -88363,7 +88363,7 @@ class CacheConfig {
                 try {
                     const content = await promises_default().readFile(cargo_lock, { encoding: "utf8" });
                     const parsed = parse(content);
-                    if (parsed.version !== 3 || !("package" in parsed)) {
+                    if ((parsed.version !== 3 && parsed.version !== 4) || !("package" in parsed)) {
                         // Fallback to caching them as regular file since this action
                         // can only handle Cargo.lock format version 3
                         lib_core.warning('Unsupported Cargo.lock format, fallback to caching entire file');
diff --git a/dist/save/index.js b/dist/save/index.js
index f50bde9..046bfae 100644
--- a/dist/save/index.js
+++ b/dist/save/index.js
@@ -88363,7 +88363,7 @@ class CacheConfig {
                 try {
                     const content = await promises_default().readFile(cargo_lock, { encoding: "utf8" });
                     const parsed = parse(content);
-                    if (parsed.version !== 3 || !("package" in parsed)) {
+                    if ((parsed.version !== 3 && parsed.version !== 4) || !("package" in parsed)) {
                         // Fallback to caching them as regular file since this action
                         // can only handle Cargo.lock format version 3
                         core.warning('Unsupported Cargo.lock format, fallback to caching entire file');
diff --git a/src/config.ts b/src/config.ts
index 2b24788..15ca1cf 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -197,7 +197,7 @@ export class CacheConfig {
           const content = await fs_promises.readFile(cargo_lock, { encoding: "utf8" });
           const parsed = toml.parse(content);
 
-          if (parsed.version !== 3 || !("package" in parsed)) {
+          if ((parsed.version !== 3 && parsed.version !== 4) || !("package" in parsed)) {
             // Fallback to caching them as regular file since this action
             // can only handle Cargo.lock format version 3
             core.warning('Unsupported Cargo.lock format, fallback to caching entire file');