diff --git a/appveyor.yml b/appveyor.yml
index 85ca7702..b3bcc5c2 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -49,7 +49,7 @@ install:
   - go get -u github.com/golang-sql/civil
   - go get -u github.com/golang-sql/sqlexp
   - go get -u golang.org/x/crypto/md4
-  - go get github.com/stretchr/testify/assert
+  - go get github.com/stretchr/testify/assert@v1.8.1
   - go get -u golang.org/x/text/encoding/unicode
 
 build_script: