diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index b534f5c..6d14e1a 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -10,19 +10,17 @@ permissions:
 
 jobs:
   build:
-    strategy:
-      fail-fast: false
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
-          go-version: "1.18.5"
+          go-version: "1.24.7"
 
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@2226d7cb06a077cd73e56eedd38eecad18e5d837
+        uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20
         with:
-          version: v1.47.3
+          version: v2.11.4
           args: --verbose --config .golangci.yaml
           skip-cache: true
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index dcdba63..c5957c6 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -11,15 +11,13 @@ permissions:
 
 jobs:
   test:
-    strategy:
-      fail-fast: false
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
-          go-version: "1.18.5"
+          go-version: "1.24.7"
 
       - name: Build program
         run: go build ./...
diff --git a/.golangci.yaml b/.golangci.yaml
index 4149076..ad095cc 100644
--- a/.golangci.yaml
+++ b/.golangci.yaml
@@ -1,48 +1,27 @@
 # prerequisite:
 #   [install golangci-lint](https://golangci-lint.run/usage/install/#local-installation)
-run:
-  # timeout for analysis, e.g. 30s, 5m, default is 1m
-  timeout: 5m
-
-  skip-files:
-    - .peg\.go
-    - .*\.pb\.go
-  skip-dirs:
-    - vendor
-
+version: "2"
 linters:
   enable:
-    - deadcode
-    - depguard
     - errcheck
-    - exportloopref
     - gocritic
     - gocyclo
-    - gofmt
-    - goimports
     - gosec
-    - gosimple
     - govet
     - ineffassign
     - misspell
     - nakedret
-    - prealloc
     - revive
     - staticcheck
-    - structcheck
-    - typecheck
     - unconvert
     - unused
-    - varcheck
   disable:
     - gochecknoglobals # we allow global variables in packages
     - gochecknoinits # we allow inits in packages
     - goconst # we allow repeated values to go un-const'd
     - lll # we allow any line length
     - unparam # we allow function calls to name unused parameters
-
-issues:
-  exclude-rules:
-    # Probably some broken linter for generics?
-    - linters: [ revive ]
-      text: 'receiver-naming: receiver name \S+ should be consistent with previous receiver name \S+ for invalid-type'
+formatters:
+  enable:
+    - gofmt
+    - goimports
diff --git a/cmd/spdx-validate/main.go b/cmd/spdx-validate/main.go
index d31bf2d..d386f25 100644
--- a/cmd/spdx-validate/main.go
+++ b/cmd/spdx-validate/main.go
@@ -1,3 +1,4 @@
+// Package main validates newline-separated SPDX expressions from stdin or a file.
 package main
 
 import (
@@ -26,14 +27,17 @@ Examples:
   echo "MIT" | spdx-validate
   printf "MIT\nApache-2.0\n" | spdx-validate
   spdx-validate -f licenses.txt`,
-	RunE: func(cmd *cobra.Command, args []string) error {
+	RunE: func(_ *cobra.Command, _ []string) error {
 		var r io.Reader = os.Stdin
 		if filePath != "" {
+			// #nosec G304 -- file path is an explicit CLI input for this command.
 			f, err := os.Open(filePath)
 			if err != nil {
 				return fmt.Errorf("unable to open file: %w", err)
 			}
-			defer f.Close()
+			defer func() {
+				_ = f.Close()
+			}()
 			r = f
 		}
 		ok, err := validateExpressions(r, os.Stderr)
@@ -71,7 +75,7 @@ func validateExpressions(r io.Reader, w io.Writer) (bool, error) {
 		valid, _ := spdxexp.ValidateLicenses([]string{line})
 		if !valid {
 			failures++
-			fmt.Fprintf(w, "line %d: invalid SPDX expression: %q\n", lineNum, line)
+			_, _ = fmt.Fprintf(w, "line %d: invalid SPDX expression: %q\n", lineNum, line)
 		}
 	}
 
@@ -84,7 +88,7 @@ func validateExpressions(r io.Reader, w io.Writer) (bool, error) {
 	}
 
 	if failures > 0 {
-		fmt.Fprintf(w, "%d of %d expressions failed validation\n", failures, lineNum)
+		_, _ = fmt.Fprintf(w, "%d of %d expressions failed validation\n", failures, lineNum)
 		return false, nil
 	}
 
diff --git a/cmd/spdx-validate/main_test.go b/cmd/spdx-validate/main_test.go
index 9fe7388..a0c4d46 100644
--- a/cmd/spdx-validate/main_test.go
+++ b/cmd/spdx-validate/main_test.go
@@ -166,11 +166,14 @@ func TestValidateExpressions_FromTempFile(t *testing.T) {
 		t.Fatalf("failed to write temp file: %v", err)
 	}
 
+	// #nosec G304 -- path is created within t.TempDir for this test.
 	f, err := os.Open(path)
 	if err != nil {
 		t.Fatalf("failed to open temp file: %v", err)
 	}
-	defer f.Close()
+	defer func() {
+		_ = f.Close()
+	}()
 
 	var w bytes.Buffer
 	ok, err := validateExpressions(f, &w)
@@ -191,11 +194,14 @@ func TestValidateExpressions_FromTempFileWithFailures(t *testing.T) {
 		t.Fatalf("failed to write temp file: %v", err)
 	}
 
+	// #nosec G304 -- path is created within t.TempDir for this test.
 	f, err := os.Open(path)
 	if err != nil {
 		t.Fatalf("failed to open temp file: %v", err)
 	}
-	defer f.Close()
+	defer func() {
+		_ = f.Close()
+	}()
 
 	var w bytes.Buffer
 	ok, err := validateExpressions(f, &w)
diff --git a/spdxexp/benchmark_setup_test.go b/spdxexp/benchmark_setup_test.go
index 85bab37..33e3303 100644
--- a/spdxexp/benchmark_setup_test.go
+++ b/spdxexp/benchmark_setup_test.go
@@ -41,10 +41,10 @@ func TestMain(m *testing.M) {
 			_ = benchFlag.Value.Set("$^")
 		}
 
-		fmt.Fprintln(os.Stdout, "Benchmark summary tables:")
-		fmt.Fprintln(os.Stdout, "- ns/op average: average time per operation")
-		fmt.Fprintln(os.Stdout, "- Scale: relative to a fixed baseline per table")
-		fmt.Fprintln(os.Stdout, "")
+		_, _ = fmt.Fprintln(os.Stdout, "Benchmark summary tables:")
+		_, _ = fmt.Fprintln(os.Stdout, "- ns/op average: average time per operation")
+		_, _ = fmt.Fprintln(os.Stdout, "- Scale: relative to a fixed baseline per table")
+		_, _ = fmt.Fprintln(os.Stdout, "")
 	}
 
 	code := m.Run()
@@ -148,10 +148,10 @@ func printBenchmarkTable(w *os.File, title string, rows []benchmarkTableRow, ben
 	}
 
 	line := func() {
-		fmt.Fprintf(w, "+-%s-+-%s-+-%s-+\n", strings.Repeat("-", col1), strings.Repeat("-", col2), strings.Repeat("-", col3))
+		_, _ = fmt.Fprintf(w, "+-%s-+-%s-+-%s-+\n", strings.Repeat("-", col1), strings.Repeat("-", col2), strings.Repeat("-", col3))
 	}
 	row := func(c1, c2, c3 string) {
-		fmt.Fprintf(w, "| %-*s | %-*s | %-*s |\n", col1, c1, col2, c2, col3, c3)
+		_, _ = fmt.Fprintf(w, "| %-*s | %-*s | %-*s |\n", col1, c1, col2, c2, col3, c3)
 	}
 
 	line()
@@ -162,7 +162,7 @@ func printBenchmarkTable(w *os.File, title string, rows []benchmarkTableRow, ben
 		row(r.label, ns, r.scale)
 	}
 	line()
-	fmt.Fprintln(w, "")
+	_, _ = fmt.Fprintln(w, "")
 }
 
 func nsNumberString(ns float64) string {
diff --git a/spdxexp/doc.go b/spdxexp/doc.go
index f487539..04ba228 100644
--- a/spdxexp/doc.go
+++ b/spdxexp/doc.go
@@ -1,6 +1,7 @@
 /*
-Spdxexp package validates licenses and determines if a license expression is satisfied by a list of licenses.
-Validity of a license is determined by the [SPDX license list].
+Package spdxexp validates licenses and determines if a license expression is
+satisfied by a list of licenses. Validity of a license is determined by the
+[SPDX license list].
 
 [SPDX license list]: https://spdx.org/licenses/
 */
diff --git a/spdxexp/spdxlicenses/doc.go b/spdxexp/spdxlicenses/doc.go
index 81d3860..0d6725f 100644
--- a/spdxexp/spdxlicenses/doc.go
+++ b/spdxexp/spdxlicenses/doc.go
@@ -1,8 +1,10 @@
 /*
-Spdxlicenses package provides functions to get licenses, deprecated licenses, and exceptions.  These are auto-generated and should not be modified directly.
+Package spdxlicenses provides functions to get licenses, deprecated licenses,
+and exceptions. These are auto-generated and should not be modified directly.
 Licenses are generated from the [SPDX official machine readable license list].
 
-In addition, this package includes a function to return license ranges for sequential licenses and ranges including modifiers (i.e. -only, -or-later).
+In addition, this package includes a function to return license ranges for
+sequential licenses and ranges including modifiers (i.e. -only, -or-later).
 
 [SPDX official machine readable license list]: https://github.com/spdx/license-list-data
 */
diff --git a/spdxexp/spdxlicenses/license_ranges.go b/spdxexp/spdxlicenses/license_ranges.go
index 4fb87da..e5b01be 100644
--- a/spdxexp/spdxlicenses/license_ranges.go
+++ b/spdxexp/spdxlicenses/license_ranges.go
@@ -1,6 +1,6 @@
 package spdxlicenses
 
-// licenseRanges returns a list of license ranges.
+// LicenseRanges returns a list of license ranges.
 //
 // Ranges are organized into groups (referred to as license groups) of the same base license (e.g. GPL).
 // Groups have sub-groups of license versions (referred to as the range) where each member is considered