diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 86980cf..0498a4d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        go-version: ['1.17', '1.18']
+        go-version: ['1.18']
     runs-on: ${{ matrix.os }}
 
     steps:
diff --git a/README.md b/README.md
index 518759f..3999fbc 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ minitrust uses [go-minisign][go-minisign].
 
 ## Compile
 
-Build from source with Go 1.17+.
+Build from source with Go 1.18+.
 
 	% go build -o . ./cmd/minitrust/minitrust.go