diff --git a/.golangci.toml b/.golangci.toml
index 6c81374..5cd887f 100644
--- a/.golangci.toml
+++ b/.golangci.toml
@@ -102,7 +102,16 @@ excludes = [
   'G304',
   'G307',
   'G702',
-  'G706'
+  'G706',
+]
+includes = [
+  'G501', # Import blocklist: crypto/md5
+  'G502', # Import blocklist: crypto/des
+  'G503', # Import blocklist: crypto/rc4
+  'G504', # Import blocklist: net/http/cgi
+  'G505', # Import blocklist: crypto/sha1
+  'G506', # Import blocklist: golang.org/x/crypto/md4
+  'G507', # Import blocklist: golang.org/x/crypto/ripemd160
 ]
 
 [linters.settings.gosec.config]
diff --git a/mage/main.go b/mage/main.go
index 49df3d3..393f97d 100644
--- a/mage/main.go
+++ b/mage/main.go
@@ -3,7 +3,7 @@ package mage
 
 import (
 	"context"
-	"crypto/sha256"
+	"crypto/sha3"
 	"errors"
 	"flag"
 	"fmt"
@@ -682,13 +682,13 @@ func ExeName(goCmd, cacheDir string, files []string) (string, error) {
 	}
 	// hash the mainfile template to ensure if it gets updated, we make a new
 	// binary.
-	hashes = append(hashes, fmt.Sprintf("%x", sha256.Sum256([]byte(mageMainfileTplString))))
+	hashes = append(hashes, fmt.Sprintf("%x", sha3.Sum256([]byte(mageMainfileTplString))))
 	sort.Strings(hashes)
 	ver, err := internal.OutputDebug(goCmd, "version")
 	if err != nil {
 		return "", err
 	}
-	hash := sha256.Sum256([]byte(strings.Join(hashes, "") + magicRebuildKey + ver))
+	hash := sha3.Sum256([]byte(strings.Join(hashes, "") + magicRebuildKey + ver))
 	filename := fmt.Sprintf("%x", hash)
 
 	out := filepath.Join(cacheDir, filename)
@@ -705,7 +705,7 @@ func hashFile(fn string) (string, error) {
 	}
 	defer f.Close()
 
-	h := sha256.New()
+	h := sha3.New256()
 	if _, err := io.Copy(h, f); err != nil {
 		return "", fmt.Errorf("can't write data to hash: %w", err)
 	}
diff --git a/mg/fn_test.go b/mg/fn_test.go
index 95f2b58..697bf5c 100644
--- a/mg/fn_test.go
+++ b/mg/fn_test.go
@@ -52,7 +52,7 @@ func TestFuncCheck(t *testing.T) {
 		t.Error("func is not on a namespace")
 	}
 
-	hasContext, isNamespace, err = checkF(Foo.Bare, nil)
+	_, _, err = checkF(Foo.Bare, nil)
 	if err != nil {
 		t.Error(err)
 	}