diff --git a/.travis.yml b/.travis.yml
index 2c9a5e5..be30823 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: go
 
 go:
-  - "1.9"
-  - "1.10"
+  - "1.15"
+  - "1.16"
 
 install:
   - go get github.com/mattn/goveralls
diff --git a/go.mod b/go.mod
index 9ab6ec0..f70ef9d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/osteele/liquid
 
-go 1.16
+go 1.15
 
 require (
 	github.com/osteele/tuesday v1.0.3