diff --git a/.circleci/config.yml b/.circleci/config.yml
index 30b2ef5e4..65534faa6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -263,7 +263,7 @@ workflows:
             - setup
           matrix:
             parameters:
-              golang_version: ["1.14.15", "1.15.8", "1.16.3"]
+              golang_version: ["1.15.8", "1.16.10"]
       - test:
           name: << matrix.test_make_target >>
           resource_class: xlarge
diff --git a/Makefile b/Makefile
index 9878b09d8..e2f659cf2 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ BUILD_TIME := $(shell date -u +%FT%T%z)
 SHARD_WIDTH = 20
 COMMIT := $(shell git describe --exact-match >/dev/null 2>&1 || git rev-parse --short HEAD)
 LDFLAGS="-X github.com/molecula/featurebase/v2.Version=$(VERSION) -X github.com/molecula/featurebase/v2.BuildTime=$(BUILD_TIME) -X github.com/molecula/featurebase/v2.Variant=$(VARIANT) -X github.com/molecula/featurebase/v2.Commit=$(COMMIT) -X github.com/molecula/featurebase/v2.TrialDeadline=$(TRIAL_DEADLINE)"
-GO_VERSION=1.16.3
+GO_VERSION=1.16.10
 DOCKER_BUILD= # set to 1 to use `docker-build` instead of `build` when creating a release
 BUILD_TAGS += shardwidth$(SHARD_WIDTH)
 TEST_TAGS = roaringparanoia
diff --git a/cmd/roaring-migrate/main.go b/cmd/roaring-migrate/main.go
index 627d56ef2..e12348e56 100644
--- a/cmd/roaring-migrate/main.go
+++ b/cmd/roaring-migrate/main.go
@@ -243,6 +243,9 @@ func copyFile(src, dest string) error {
 }
 
 func Migrate(dataDir, backupPath string) error {
+	if strings.HasSuffix(dataDir, "/") {
+		dataDir = dataDir[:len(dataDir)-1]
+	}
 	err := os.MkdirAll(backupPath, 0777)
 	if err != nil {
 		return err
diff --git a/cover-everything.sh b/cover-everything.sh
index f34640cfb..500c9013b 100755
--- a/cover-everything.sh
+++ b/cover-everything.sh
@@ -2,7 +2,8 @@
 
 # actually get test coverage for every single package and subpackage
 # very slow but oh well what are you gonna do, not test things?  
+# note it skips the roaring migrate
 echo "mode: atomic" > coverage.out
-for pkg in $(go list all | grep featurebase); do
+for pkg in $(go list all | grep featurebase | grep -v roaring-migrate); do
     go test -coverprofile=pkgcoverage.out -covermode=atomic $pkg;
     tail -n +2 pkgcoverage.out >> coverage.out; done