diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 0ad6d392..f8c928a5 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.18', '1.19', '1.20', '1.21', '1.22' ]
+        go: [ '1.20', '1.21', '1.22' ]
 
     steps:
     - name: Set up Go
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 1405bef1..4ad9c609 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -20,10 +20,12 @@ When releasing a new version:
 
 <!-- Add new changes in this section! -->
 
-Note that genqlient is now tested through Go 1.22.
+Note that genqlient is now tested from Go 1.20 through Go 1.22.
 
 ### Breaking changes:
 
+- genqlient now requires Go 1.20 or higher. It may still work with earlier versions, but we aren't explicitly keeping dependency modules to Go 1.18 and lower.
+
 ### New features:
 
 - The new `optional: generic` allows using a generic type to represent optionality. See the [documentation](genqlient.yaml) for details.
diff --git a/go.mod b/go.mod
index c011393e..5741c420 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/Khan/genqlient
 
-go 1.18
+go 1.20
 
 require (
 	github.com/99designs/gqlgen v0.17.44