diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 2cbb8e2..21f6df4 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -12,18 +12,18 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.19]
+        go-version: [1.18, 1.19]
     runs-on: ubuntu-latest
 
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go-version }}
         id: go
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install staticcheck
         run: go install honnef.co/go/tools/cmd/staticcheck@latest
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 99643d8..7385df2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,19 +13,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.19]
+        go-version: [1.18, 1.19]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
 
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go-version }}
         id: go
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run tests
         run: go test -race ./...
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb64630..0f24ed2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,17 @@
 # CHANGELOG
 
+## v0.4.0
+
+**This is the first release of package socket that only supports Go 1.18+.
+Users on older versions of Go must use v0.3.0.**
+
+- [Improvement]: drop support for older versions of Go so we can begin using
+  modern versions of `x/sys` and other dependencies.
+
 ## v0.3.0
 
+**This is the last release of package socket that supports Go 1.17 and below.**
+
 - [New API/API change] [PR](https://github.com/mdlayher/socket/pull/8):
   numerous `socket.Conn` methods now support context cancelation. Future
   releases will continue adding support as needed.
diff --git a/README.md b/README.md
index 97ddcd6..2aa065c 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,12 @@ used directly in end user applications.
 
 Any use of package socket should be guarded by build tags, as one would also
 use when importing the `syscall` or `golang.org/x/sys` packages.
+
+## Stability
+
+See the [CHANGELOG](./CHANGELOG.md) file for a description of changes between
+releases.
+
+This package only supports the two most recent major versions of Go, mirroring
+Go's own release policy. Older versions of Go may lack critical features and bug
+fixes which are necessary for this package to function correctly.
diff --git a/go.mod b/go.mod
index a1fdf6d..22873be 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,10 @@
 module github.com/mdlayher/socket
 
-go 1.17
+go 1.18
 
 require (
-	github.com/google/go-cmp v0.5.7
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20220325203850-36772127a21f
+	github.com/google/go-cmp v0.5.9
+	golang.org/x/net v0.2.0
+	golang.org/x/sync v0.1.0
+	golang.org/x/sys v0.2.0
 )
-
-// Intentional pin to an older release; we don't need new features and would
-// like to support older verions of Go.
-require golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c
diff --git a/go.sum b/go.sum
index ee7b396..11edeaf 100644
--- a/go.sum
+++ b/go.sum
@@ -1,13 +1,8 @@
-github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
-github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c h1:uOCk1iQW6Vc18bnC13MfzScl+wdKBmM9Y9kU7Z83/lw=
-golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20220325203850-36772127a21f h1:TrmogKRsSOxRMJbLYGrB4SBbW+LJcEllYBLME5Zk5pU=
-golang.org/x/sys v0.0.0-20220325203850-36772127a21f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+golang.org/x/net v0.2.0 h1:sZfSu1wtKLGlWI4ZZayP0ck9Y73K1ynO6gqzTdBVdPU=
+golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=