diff --git a/cmd/siftool/modif.go b/cmd/siftool/modif.go
index 01672087..7bd3c65b 100644
--- a/cmd/siftool/modif.go
+++ b/cmd/siftool/modif.go
@@ -13,7 +13,7 @@ import (
 	"strconv"
 
 	"github.com/sylabs/sif/internal/app/siftool"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 var (
diff --git a/cmd/siftool/siftool.go b/cmd/siftool/siftool.go
index bd8cbfdf..c3b3b4fa 100644
--- a/cmd/siftool/siftool.go
+++ b/cmd/siftool/siftool.go
@@ -14,7 +14,7 @@ import (
 	"os"
 	"runtime"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 var usageMessage = `siftool is a utility program for manipulating SIF files.
diff --git a/internal/app/siftool/file.go b/internal/app/siftool/file.go
index 56b10acb..b8926d8f 100644
--- a/internal/app/siftool/file.go
+++ b/internal/app/siftool/file.go
@@ -6,7 +6,7 @@
 package siftool
 
 import (
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 // withFileImage calls fn with a FileImage loaded from path.
diff --git a/internal/app/siftool/info.go b/internal/app/siftool/info.go
index a1facbf7..1470cc8d 100644
--- a/internal/app/siftool/info.go
+++ b/internal/app/siftool/info.go
@@ -14,7 +14,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 // Header displays a SIF file global header.
diff --git a/internal/app/siftool/modif.go b/internal/app/siftool/modif.go
index 53597742..d2a5169d 100644
--- a/internal/app/siftool/modif.go
+++ b/internal/app/siftool/modif.go
@@ -12,7 +12,7 @@ import (
 	"io"
 
 	uuid "github.com/satori/go.uuid"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 // New creates a new empty SIF file.
diff --git a/pkg/integrity/digest.go b/pkg/integrity/digest.go
index 3f248c8a..8daee6a2 100644
--- a/pkg/integrity/digest.go
+++ b/pkg/integrity/digest.go
@@ -15,7 +15,7 @@ import (
 	"io"
 	"strings"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 var (
diff --git a/pkg/integrity/digest_test.go b/pkg/integrity/digest_test.go
index 4b4ad203..997f1c5f 100644
--- a/pkg/integrity/digest_test.go
+++ b/pkg/integrity/digest_test.go
@@ -17,7 +17,7 @@ import (
 	"testing"
 
 	"github.com/sebdah/goldie/v2"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 func TestNewLegacyDigest(t *testing.T) {
diff --git a/pkg/integrity/doc.go b/pkg/integrity/doc.go
index 19739fd0..e332573e 100644
--- a/pkg/integrity/doc.go
+++ b/pkg/integrity/doc.go
@@ -42,5 +42,10 @@ on object group 1 only:
 Finally, to perform cryptographic verification:
 
 	err := v.Verify()
+
+Deprecated: this package is deprecated. Users should migrate applications to package
+github.com/sylabs/sif/v2/pkg/integrity.
+
+This package is frozen and no new functionality will be added.
 */
 package integrity
diff --git a/pkg/integrity/metadata.go b/pkg/integrity/metadata.go
index 664733f2..e73de61f 100644
--- a/pkg/integrity/metadata.go
+++ b/pkg/integrity/metadata.go
@@ -13,7 +13,7 @@ import (
 	"fmt"
 	"io"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 var (
diff --git a/pkg/integrity/metadata_test.go b/pkg/integrity/metadata_test.go
index a7b288e8..97a26513 100644
--- a/pkg/integrity/metadata_test.go
+++ b/pkg/integrity/metadata_test.go
@@ -19,7 +19,7 @@ import (
 
 	uuid "github.com/satori/go.uuid"
 	"github.com/sebdah/goldie/v2"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 func TestWriteHeader(t *testing.T) {
diff --git a/pkg/integrity/result.go b/pkg/integrity/result.go
index 8bd0af25..e245c4d3 100644
--- a/pkg/integrity/result.go
+++ b/pkg/integrity/result.go
@@ -6,7 +6,7 @@
 package integrity
 
 import (
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 	"golang.org/x/crypto/openpgp"
 )
 
diff --git a/pkg/integrity/select.go b/pkg/integrity/select.go
index 246b9b19..93bfbb0b 100644
--- a/pkg/integrity/select.go
+++ b/pkg/integrity/select.go
@@ -12,7 +12,7 @@ import (
 	"io"
 	"sort"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 var (
diff --git a/pkg/integrity/sign.go b/pkg/integrity/sign.go
index 07aa2a89..a60961f3 100644
--- a/pkg/integrity/sign.go
+++ b/pkg/integrity/sign.go
@@ -13,7 +13,7 @@ import (
 	"fmt"
 	"sort"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 	"golang.org/x/crypto/openpgp"
 	"golang.org/x/crypto/openpgp/packet"
 )
diff --git a/pkg/integrity/sign_test.go b/pkg/integrity/sign_test.go
index 8ef1457a..3db0b449 100644
--- a/pkg/integrity/sign_test.go
+++ b/pkg/integrity/sign_test.go
@@ -15,7 +15,7 @@ import (
 	"testing"
 
 	"github.com/sebdah/goldie/v2"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 	"golang.org/x/crypto/openpgp"
 	"golang.org/x/crypto/openpgp/packet"
 )
diff --git a/pkg/integrity/verify.go b/pkg/integrity/verify.go
index 2fd9adde..53681f40 100644
--- a/pkg/integrity/verify.go
+++ b/pkg/integrity/verify.go
@@ -13,7 +13,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 	"golang.org/x/crypto/openpgp"
 )
 
diff --git a/pkg/integrity/verify_test.go b/pkg/integrity/verify_test.go
index 9289f559..50ec2f1f 100644
--- a/pkg/integrity/verify_test.go
+++ b/pkg/integrity/verify_test.go
@@ -12,7 +12,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 	"golang.org/x/crypto/openpgp"
 	pgperrors "golang.org/x/crypto/openpgp/errors"
 )
diff --git a/pkg/sif/sif.go b/pkg/sif/sif.go
index 1ddccc26..7915c3a5 100644
--- a/pkg/sif/sif.go
+++ b/pkg/sif/sif.go
@@ -80,6 +80,10 @@
 //     | .                                              |
 //     `================================================'
 //
+// Deprecated: this package is deprecated. Users should migrate applications to package
+// github.com/sylabs/sif/v2/pkg/sif.
+//
+// This package is frozen and no new functionality will be added.
 package sif
 
 import (
diff --git a/pkg/siftool/add.go b/pkg/siftool/add.go
index 5992acaa..01eeadb5 100644
--- a/pkg/siftool/add.go
+++ b/pkg/siftool/add.go
@@ -13,7 +13,7 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/sylabs/sif/internal/app/siftool"
-	"github.com/sylabs/sif/pkg/sif"
+	"github.com/sylabs/sif/pkg/sif" //nolint:staticcheck // In use until v2 API
 )
 
 // Add implements 'siftool add' sub-command.
diff --git a/pkg/siftool/siftool.go b/pkg/siftool/siftool.go
index 12d41649..2796b87c 100644
--- a/pkg/siftool/siftool.go
+++ b/pkg/siftool/siftool.go
@@ -7,6 +7,11 @@
 
 // Package siftool implements cobra.Command structs for the siftool functionality. This
 // allows for easy inclusion of siftool functions in the singularity cli.
+//
+// Deprecated: this package is deprecated. Users should migrate applications to package
+// github.com/sylabs/sif/v2/pkg/siftool.
+//
+// This package is frozen and no new functionality will be added.
 package siftool
 
 import (