diff --git a/internal/imports/mkstdlib.go b/internal/imports/mkstdlib.go
index 8eb4e12..47714bf 100644
--- a/internal/imports/mkstdlib.go
+++ b/internal/imports/mkstdlib.go
@@ -70,6 +70,7 @@ func main() {
 		mustOpen(api("go1.15.txt")),
 		mustOpen(api("go1.16.txt")),
 		mustOpen(api("go1.17.txt")),
+		mustOpen(api("go1.18.txt")),
 
 		// The API of the syscall/js package needs to be computed explicitly,
 		// because it's not included in the GOROOT/api/go1.*.txt files at this time.
diff --git a/internal/imports/zstdlib.go b/internal/imports/zstdlib.go
index 7de2be9..437fbb7 100644
--- a/internal/imports/zstdlib.go
+++ b/internal/imports/zstdlib.go
@@ -88,6 +88,7 @@ var stdlib = map[string][]string{
 		"ContainsAny",
 		"ContainsRune",
 		"Count",
+		"Cut",
 		"Equal",
 		"EqualFold",
 		"ErrTooLarge",
@@ -711,6 +712,11 @@ var stdlib = map[string][]string{
 		"ValueConverter",
 		"Valuer",
 	},
+	"debug/buildinfo": []string{
+		"BuildInfo",
+		"Read",
+		"ReadFile",
+	},
 	"debug/dwarf": []string{
 		"AddrType",
 		"ArrayType",
@@ -1944,6 +1950,7 @@ var stdlib = map[string][]string{
 		"R_PPC64_REL24_NOTOC",
 		"R_PPC64_REL32",
 		"R_PPC64_REL64",
+		"R_PPC64_RELATIVE",
 		"R_PPC64_SECTOFF_DS",
 		"R_PPC64_SECTOFF_LO_DS",
 		"R_PPC64_TLS",
@@ -2547,6 +2554,7 @@ var stdlib = map[string][]string{
 		"Symbol",
 	},
 	"debug/plan9obj": []string{
+		"ErrNoSymbols",
 		"File",
 		"FileHeader",
 		"Magic386",
@@ -2906,6 +2914,7 @@ var stdlib = map[string][]string{
 		"Importer",
 		"IncDecStmt",
 		"IndexExpr",
+		"IndexListExpr",
 		"Inspect",
 		"InterfaceType",
 		"IsExported",
@@ -3179,6 +3188,7 @@ var stdlib = map[string][]string{
 		"SUB",
 		"SUB_ASSIGN",
 		"SWITCH",
+		"TILDE",
 		"TYPE",
 		"Token",
 		"UnaryPrec",
@@ -3187,6 +3197,7 @@ var stdlib = map[string][]string{
 		"XOR_ASSIGN",
 	},
 	"go/types": []string{
+		"ArgumentError",
 		"Array",
 		"AssertableTo",
 		"AssignableTo",
@@ -3205,6 +3216,7 @@ var stdlib = map[string][]string{
 		"Complex64",
 		"Config",
 		"Const",
+		"Context",
 		"ConvertibleTo",
 		"DefPredeclaredTestFuncs",
 		"Default",
@@ -3224,6 +3236,8 @@ var stdlib = map[string][]string{
 		"ImporterFrom",
 		"Info",
 		"Initializer",
+		"Instance",
+		"Instantiate",
 		"Int",
 		"Int16",
 		"Int32",
@@ -3254,6 +3268,7 @@ var stdlib = map[string][]string{
 		"NewChan",
 		"NewChecker",
 		"NewConst",
+		"NewContext",
 		"NewField",
 		"NewFunc",
 		"NewInterface",
@@ -3268,10 +3283,14 @@ var stdlib = map[string][]string{
 		"NewPointer",
 		"NewScope",
 		"NewSignature",
+		"NewSignatureType",
 		"NewSlice",
 		"NewStruct",
+		"NewTerm",
 		"NewTuple",
 		"NewTypeName",
+		"NewTypeParam",
+		"NewUnion",
 		"NewVar",
 		"Nil",
 		"Object",
@@ -3296,11 +3315,15 @@ var stdlib = map[string][]string{
 		"StdSizes",
 		"String",
 		"Struct",
+		"Term",
 		"Tuple",
 		"Typ",
 		"Type",
 		"TypeAndValue",
+		"TypeList",
 		"TypeName",
+		"TypeParam",
+		"TypeParamList",
 		"TypeString",
 		"Uint",
 		"Uint16",
@@ -3308,6 +3331,7 @@ var stdlib = map[string][]string{
 		"Uint64",
 		"Uint8",
 		"Uintptr",
+		"Union",
 		"Universe",
 		"Unsafe",
 		"UnsafePointer",
@@ -4080,9 +4104,11 @@ var stdlib = map[string][]string{
 		"SRV",
 		"SplitHostPort",
 		"TCPAddr",
+		"TCPAddrFromAddrPort",
 		"TCPConn",
 		"TCPListener",
 		"UDPAddr",
+		"UDPAddrFromAddrPort",
 		"UDPConn",
 		"UnixAddr",
 		"UnixConn",
@@ -4142,6 +4168,7 @@ var stdlib = map[string][]string{
 		"ListenAndServe",
 		"ListenAndServeTLS",
 		"LocalAddrContextKey",
+		"MaxBytesHandler",
 		"MaxBytesReader",
 		"MethodConnect",
 		"MethodDelete",
@@ -4338,6 +4365,25 @@ var stdlib = map[string][]string{
 		"ParseDate",
 		"ReadMessage",
 	},
+	"net/netip": []string{
+		"Addr",
+		"AddrFrom16",
+		"AddrFrom4",
+		"AddrFromSlice",
+		"AddrPort",
+		"AddrPortFrom",
+		"IPv4Unspecified",
+		"IPv6LinkLocalAllNodes",
+		"IPv6Unspecified",
+		"MustParseAddr",
+		"MustParseAddrPort",
+		"MustParsePrefix",
+		"ParseAddr",
+		"ParseAddrPort",
+		"ParsePrefix",
+		"Prefix",
+		"PrefixFrom",
+	},
 	"net/rpc": []string{
 		"Accept",
 		"Call",
@@ -4641,6 +4687,8 @@ var stdlib = map[string][]string{
 		"Method",
 		"New",
 		"NewAt",
+		"Pointer",
+		"PointerTo",
 		"Ptr",
 		"PtrTo",
 		"RecvDir",
@@ -4819,9 +4867,11 @@ var stdlib = map[string][]string{
 	},
 	"runtime/debug": []string{
 		"BuildInfo",
+		"BuildSetting",
 		"FreeOSMemory",
 		"GCStats",
 		"Module",
+		"ParseBuildInfo",
 		"PrintStack",
 		"ReadBuildInfo",
 		"ReadGCStats",
@@ -4939,11 +4989,13 @@ var stdlib = map[string][]string{
 	},
 	"strings": []string{
 		"Builder",
+		"Clone",
 		"Compare",
 		"Contains",
 		"ContainsAny",
 		"ContainsRune",
 		"Count",
+		"Cut",
 		"EqualFold",
 		"Fields",
 		"FieldsFunc",
@@ -9793,6 +9845,7 @@ var stdlib = map[string][]string{
 		"Syscall18",
 		"Syscall6",
 		"Syscall9",
+		"SyscallN",
 		"Sysctl",
 		"SysctlUint32",
 		"Sysctlnode",
@@ -10202,7 +10255,6 @@ var stdlib = map[string][]string{
 		"Value",
 		"ValueError",
 		"ValueOf",
-		"Wrapper",
 	},
 	"testing": []string{
 		"AllocsPerRun",
@@ -10213,9 +10265,11 @@ var stdlib = map[string][]string{
 		"CoverBlock",
 		"CoverMode",
 		"Coverage",
+		"F",
 		"Init",
 		"InternalBenchmark",
 		"InternalExample",
+		"InternalFuzzTarget",
 		"InternalTest",
 		"M",
 		"Main",
@@ -10313,9 +10367,11 @@ var stdlib = map[string][]string{
 		"ActionNode",
 		"BoolNode",
 		"BranchNode",
+		"BreakNode",
 		"ChainNode",
 		"CommandNode",
 		"CommentNode",
+		"ContinueNode",
 		"DotNode",
 		"FieldNode",
 		"IdentifierNode",
@@ -10329,9 +10385,11 @@ var stdlib = map[string][]string{
 		"Node",
 		"NodeAction",
 		"NodeBool",
+		"NodeBreak",
 		"NodeChain",
 		"NodeCommand",
 		"NodeComment",
+		"NodeContinue",
 		"NodeDot",
 		"NodeField",
 		"NodeIdentifier",
@@ -10727,6 +10785,7 @@ var stdlib = map[string][]string{
 		"IsSurrogate",
 	},
 	"unicode/utf8": []string{
+		"AppendRune",
 		"DecodeLastRune",
 		"DecodeLastRuneInString",
 		"DecodeRune",