diff --git a/apps/go.mod b/apps/go.mod
index 9613bd0b..b0e20e96 100644
--- a/apps/go.mod
+++ b/apps/go.mod
@@ -1,6 +1,6 @@
 module gioui.org/apps
 
-go 1.12
+go 1.13
 
 require (
 	gioui.org/ui v0.0.0-20190902131729-7ad60e08787b
diff --git a/cmd/go.mod b/cmd/go.mod
index 474bccc5..401f45e9 100644
--- a/cmd/go.mod
+++ b/cmd/go.mod
@@ -1,6 +1,6 @@
 module gioui.org/cmd
 
-go 1.12
+go 1.13
 
 require (
 	golang.org/x/image v0.0.0-20190802002840-cff245a6509b
diff --git a/ui/go.mod b/ui/go.mod
index 9e2df813..42de2447 100644
--- a/ui/go.mod
+++ b/ui/go.mod
@@ -1,6 +1,6 @@
 module gioui.org/ui
 
-go 1.12
+go 1.13
 
 require (
 	golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9
diff --git a/website/go.mod b/website/go.mod
index 2ff325f8..75d73b57 100644
--- a/website/go.mod
+++ b/website/go.mod
@@ -1,3 +1,3 @@
 module gioui.org/website
 
-go 1.12
+go 1.13