diff --git a/deduce.go b/deduce.go
index 1e5bac4..2b2679e 100644
--- a/deduce.go
+++ b/deduce.go
@@ -268,7 +268,7 @@ func (m gopkginDeducer) deduceSource(p string, u *url.URL) (maybeSource, error)
 	} else {
 		u.Path = path.Join(v[2], v[3])
 	}
-	major, err := strconv.ParseInt(v[4][1:], 10, 64)
+	major, err := strconv.ParseUint(v[4][1:], 10, 64)
 	if err != nil {
 		// this should only be reachable if there's an error in the regex
 		return nil, fmt.Errorf("could not parse %q as a gopkg.in major version", v[4][1:])
diff --git a/glide.lock b/glide.lock
index fa41844..39cce02 100644
--- a/glide.lock
+++ b/glide.lock
@@ -8,7 +8,7 @@ imports:
 - name: github.com/hashicorp/golang-lru
   version: a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4
 - name: github.com/Masterminds/semver
-  version: 0a2c9fc0eee2c4cbb9526877c4a54da047fdcadd
+  version: 94ad6eaf8457cf85a68c9b53fa42e9b1b8683783
   vcs: git
 - name: github.com/Masterminds/vcs
   version: fbe9fb6ad5b5f35b3e82a7c21123cfc526cbf895
diff --git a/maybe_source.go b/maybe_source.go
index 08629e1..8c5191c 100644
--- a/maybe_source.go
+++ b/maybe_source.go
@@ -100,7 +100,7 @@ type maybeGopkginSource struct {
 	// the actual upstream URL - always github
 	url *url.URL
 	// the major version to apply for filtering
-	major int64
+	major uint64
 }
 
 func (m maybeGopkginSource) try(cachedir string, an ProjectAnalyzer) (source, string, error) {
diff --git a/solve_basic_test.go b/solve_basic_test.go
index 38ce56e..6f5f912 100644
--- a/solve_basic_test.go
+++ b/solve_basic_test.go
@@ -946,7 +946,7 @@ var basicFixtures = map[string]basicFixture{
 	},
 	"no version that matches requirement": {
 		ds: []depspec{
-			mkDepspec("root 0.0.0", "foo >=1.0.0, <2.0.0"),
+			mkDepspec("root 0.0.0", "foo ^1.0.0"),
 			mkDepspec("foo 2.0.0"),
 			mkDepspec("foo 2.1.3"),
 		},
diff --git a/source_test.go b/source_test.go
index 284df82..db4f1d6 100644
--- a/source_test.go
+++ b/source_test.go
@@ -125,7 +125,7 @@ func TestGopkginSourceInteractions(t *testing.T) {
 		}
 	}
 
-	tfunc := func(opath, n string, major int64, evl []Version) {
+	tfunc := func(opath, n string, major uint64, evl []Version) {
 		un := "https://" + n
 		u, err := url.Parse(un)
 		if err != nil {
diff --git a/vcs_source.go b/vcs_source.go
index 19887e5..526ad52 100644
--- a/vcs_source.go
+++ b/vcs_source.go
@@ -281,7 +281,7 @@ func (s *gitSource) doListVersions() (vlist []Version, err error) {
 // according to the input URL.
 type gopkginSource struct {
 	gitSource
-	major int64
+	major uint64
 }
 
 func (s *gopkginSource) listVersions() (vlist []Version, err error) {