diff --git a/.github/workflows/copywrite.yml b/.github/workflows/copywrite.yml
new file mode 100644
index 0000000..1b72f36
--- /dev/null
+++ b/.github/workflows/copywrite.yml
@@ -0,0 +1,24 @@
+name: Check Copywrite Headers
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  copywrite:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+      - uses: hashicorp/setup-copywrite@32638da2d4e81d56a0764aa1547882fc4d209636 # v1.1.3
+        name: Setup Copywrite
+        with:
+          version: v0.25.3
+          archive-checksum: e43f4b72fff3f219c5a5f883438d63edd5b68f5bea90a5d18abb3001c8c3aedc
+      - name: Check Header Compliance
+        run: make copywriteheaders
+permissions:
+  contents: read
diff --git a/.golangci.yml b/.golangci.yml
index 85ba7c9..90cf761 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,4 +1,4 @@
-# Copyright IBM Corp. 2019, 2025
+# Copyright IBM Corp. 2019, 2026
 # SPDX-License-Identifier: MPL-2.0
 
 version: "2"
diff --git a/LICENSE b/LICENSE
index 90eaf6d..466e285 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright IBM Corp. 2019, 2025
+Copyright IBM Corp. 2019, 2026
 
 Mozilla Public License Version 2.0
 ==================================
diff --git a/Makefile b/Makefile
index 566192e..3620efe 100644
--- a/Makefile
+++ b/Makefile
@@ -51,10 +51,15 @@ filter:
 	@go build ./examples/filter
 
 deps:
+	@go install github.com/hashicorp/copywrite@b3e6599f43beff698f471c6f46888045453fa030 # v0.25.3
 	@go get github.com/mna/pigeon@master
 	@go get golang.org/x/tools/cmd/goimports
 	@go get golang.org/x/tools/cmd/cover
 	@go mod tidy
 
-.PHONY: generate test coverage fmt deps bench examples expr-parse expr-eval filter
+copywriteheaders:
+	@echo "==> Running copywrite headers plan..."
+	@copywrite headers --plan
+	@echo "==> Done"
 
+.PHONY: generate test coverage fmt deps bench examples expr-parse expr-eval filter
diff --git a/bexpr_test.go b/bexpr_test.go
index b9707ef..3d4a741 100644
--- a/bexpr_test.go
+++ b/bexpr_test.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package bexpr
diff --git a/common_test.go b/common_test.go
index 49ba0f8..e551f03 100644
--- a/common_test.go
+++ b/common_test.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package bexpr
diff --git a/evaluate.go b/evaluate.go
index b388464..b317e57 100644
--- a/evaluate.go
+++ b/evaluate.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package bexpr
diff --git a/evaluate_test.go b/evaluate_test.go
index 1013c5e..54a01fa 100644
--- a/evaluate_test.go
+++ b/evaluate_test.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package bexpr
diff --git a/examples/expr-eval/expr-eval.go b/examples/expr-eval/expr-eval.go
index de1c4ea..b1ba513 100644
--- a/examples/expr-eval/expr-eval.go
+++ b/examples/expr-eval/expr-eval.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package main
diff --git a/filter.go b/filter.go
index d5d60f5..ec962c9 100644
--- a/filter.go
+++ b/filter.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package bexpr
diff --git a/grammar/ast.go b/grammar/ast.go
index 2aad8e1..ffc9fae 100644
--- a/grammar/ast.go
+++ b/grammar/ast.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package grammar
diff --git a/grammar/ast_test.go b/grammar/ast_test.go
index 53d6ed7..e2f7fab 100644
--- a/grammar/ast_test.go
+++ b/grammar/ast_test.go
@@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2019, 2025
+// Copyright IBM Corp. 2019, 2026
 // SPDX-License-Identifier: MPL-2.0
 
 package grammar