diff --git a/internal/arduino/resources/resources_test.go b/internal/arduino/resources/resources_test.go
index 0ca1bdd884b..3cd1d7a0098 100644
--- a/internal/arduino/resources/resources_test.go
+++ b/internal/arduino/resources/resources_test.go
@@ -131,29 +131,45 @@ func TestIndexDownloadAndSignatureWithinArchive(t *testing.T) {
 	require.NoError(t, err)
 	defer ln.Close()
 	go server.Serve(ln)
+	defer server.Close()
 
-	validIdxURL, err := url.Parse("http://" + ln.Addr().String() + "/valid/package_index.tar.bz2")
-	require.NoError(t, err)
-	idxResource := &IndexResource{URL: validIdxURL}
-	destDir, err := paths.MkTempDir("", "")
-	require.NoError(t, err)
-	defer destDir.RemoveAll()
-	err = idxResource.Download(ctx, destDir, func(curr *rpc.DownloadProgress) {}, downloader.GetDefaultConfig())
-	require.NoError(t, err)
-	require.True(t, destDir.Join("package_index.json").Exist())
-	require.True(t, destDir.Join("package_index.json.sig").Exist())
-
-	invalidIdxURL, err := url.Parse("http://" + ln.Addr().String() + "/invalid/package_index.tar.bz2")
-	require.NoError(t, err)
-	invIdxResource := &IndexResource{URL: invalidIdxURL}
-	invDestDir, err := paths.MkTempDir("", "")
-	require.NoError(t, err)
-	defer invDestDir.RemoveAll()
-	err = invIdxResource.Download(ctx, invDestDir, func(curr *rpc.DownloadProgress) {}, downloader.GetDefaultConfig())
-	require.Error(t, err)
-	require.Contains(t, err.Error(), "invalid signature")
-	require.False(t, invDestDir.Join("package_index.json").Exist())
-	require.False(t, invDestDir.Join("package_index.json.sig").Exist())
+	{
+		validIdxURL, err := url.Parse("http://" + ln.Addr().String() + "/valid_signature_in_the_future/package_index.tar.bz2")
+		require.NoError(t, err)
+		idxResource := &IndexResource{URL: validIdxURL}
+		destDir, err := paths.MkTempDir("", "")
+		require.NoError(t, err)
+		defer destDir.RemoveAll()
+		err = idxResource.Download(ctx, destDir, func(curr *rpc.DownloadProgress) {}, downloader.GetDefaultConfig())
+		require.ErrorContains(t, err, "is your system clock set correctly?")
+		require.False(t, destDir.Join("package_index.json").Exist())
+		require.False(t, destDir.Join("package_index.json.sig").Exist())
+	}
+	{
+		validIdxURL, err := url.Parse("http://" + ln.Addr().String() + "/valid/package_index.tar.bz2")
+		require.NoError(t, err)
+		idxResource := &IndexResource{URL: validIdxURL}
+		destDir, err := paths.MkTempDir("", "")
+		require.NoError(t, err)
+		defer destDir.RemoveAll()
+		err = idxResource.Download(ctx, destDir, func(curr *rpc.DownloadProgress) {}, downloader.GetDefaultConfig())
+		require.NoError(t, err)
+		require.True(t, destDir.Join("package_index.json").Exist())
+		require.True(t, destDir.Join("package_index.json.sig").Exist())
+	}
+	{
+		invalidIdxURL, err := url.Parse("http://" + ln.Addr().String() + "/invalid/package_index.tar.bz2")
+		require.NoError(t, err)
+		invIdxResource := &IndexResource{URL: invalidIdxURL}
+		invDestDir, err := paths.MkTempDir("", "")
+		require.NoError(t, err)
+		defer invDestDir.RemoveAll()
+		err = invIdxResource.Download(ctx, invDestDir, func(curr *rpc.DownloadProgress) {}, downloader.GetDefaultConfig())
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "invalid signature")
+		require.False(t, invDestDir.Join("package_index.json").Exist())
+		require.False(t, invDestDir.Join("package_index.json.sig").Exist())
+	}
 }
 
 func TestIndexFileName(t *testing.T) {
diff --git a/internal/arduino/resources/testdata/valid_signature_in_the_future/package_index.tar.bz2 b/internal/arduino/resources/testdata/valid_signature_in_the_future/package_index.tar.bz2
new file mode 100644
index 00000000000..22284c67be4
Binary files /dev/null and b/internal/arduino/resources/testdata/valid_signature_in_the_future/package_index.tar.bz2 differ
diff --git a/internal/arduino/security/signatures.go b/internal/arduino/security/signatures.go
index fb6ed9b0697..ebd86e4a037 100644
--- a/internal/arduino/security/signatures.go
+++ b/internal/arduino/security/signatures.go
@@ -16,12 +16,14 @@
 package security
 
 import (
+	"bytes"
 	"embed"
 	"errors"
 	"io"
 	"os"
 
 	"github.com/ProtonMail/go-crypto/openpgp"
+	pgperrors "github.com/ProtonMail/go-crypto/openpgp/errors"
 	"github.com/arduino/arduino-cli/internal/i18n"
 	"github.com/arduino/go-paths-helper"
 )
@@ -71,16 +73,19 @@ func VerifySignature(targetPath *paths.Path, signaturePath *paths.Path, arduinoK
 	if err != nil {
 		return false, nil, errors.New(i18n.Tr("retrieving Arduino public keys: %s", err))
 	}
-	target, err := targetPath.Open()
+	target, err := targetPath.ReadFile()
 	if err != nil {
 		return false, nil, errors.New(i18n.Tr("opening target file: %s", err))
 	}
-	defer target.Close()
-	signature, err := signaturePath.Open()
+	signature, err := signaturePath.ReadFile()
 	if err != nil {
 		return false, nil, errors.New(i18n.Tr("opening signature file: %s", err))
 	}
-	defer signature.Close()
-	signer, err := openpgp.CheckDetachedSignature(keyRing, target, signature, nil)
+	signer, err := openpgp.CheckDetachedSignature(keyRing, bytes.NewBuffer(target), bytes.NewBuffer(signature), nil)
+
+	if errors.Is(err, pgperrors.ErrSignatureExpired) {
+		err = errors.New(i18n.Tr("signature expired: is your system clock set correctly?"))
+	}
+
 	return (signer != nil && err == nil), signer, err
 }