diff --git a/.forgejo/workflows/build.yaml b/.forgejo/workflows/build.yaml
index 8ffd2dc..6b08303 100644
--- a/.forgejo/workflows/build.yaml
+++ b/.forgejo/workflows/build.yaml
@@ -14,7 +14,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.22.4
+          go-version: 1.24
       - uses: actions/setup-node@v4
         with:
           node-version: 21.1
diff --git a/ucl/builtins.go b/ucl/builtins.go
index 78dc19c..da7ddc4 100644
--- a/ucl/builtins.go
+++ b/ucl/builtins.go
@@ -180,64 +180,6 @@ func modBuiltin(ctx context.Context, args invocationArgs) (Object, error) {
 	return IntObject(n), nil
 }
 
-// TODO: this may need to be a macro
-func setBuiltin(ctx context.Context, args invocationArgs) (Object, error) {
-	if err := args.expectArgn(2); err != nil {
-		return nil, err
-	}
-
-	name, err := args.stringArg(0)
-	if err != nil {
-		return nil, err
-	} else if len(name) == 0 {
-		return nil, fmt.Errorf("attempt to set empty string")
-	}
-
-	newVal := args.args[1]
-
-	if strings.HasPrefix(name, "@") {
-		pname := name[1:]
-		pvar, ok := args.ec.getPseudoVar(pname)
-		if ok {
-			if err := pvar.set(ctx, pname, newVal); err != nil {
-				return nil, err
-			}
-			return newVal, nil
-		}
-
-		if pvar := args.inst.missingPseudoVarHandler; pvar != nil {
-			if err := pvar.set(ctx, pname, newVal); err != nil {
-				return nil, err
-			}
-			return newVal, nil
-		}
-
-		return nil, fmt.Errorf("attempt to set '%v' to a non-existent pseudo-variable", name)
-	}
-
-	args.ec.setOrDefineVar(name, newVal)
-	return newVal, nil
-}
-
-func mustSetBuiltin(ctx context.Context, args invocationArgs) (Object, error) {
-	if err := args.expectArgn(2); err != nil {
-		return nil, err
-	}
-
-	name, err := args.stringArg(0)
-	if err != nil {
-		return nil, err
-	}
-
-	newVal := args.args[1]
-	if newVal == nil {
-		return nil, fmt.Errorf("attempt to set '%v' to a nil value", args.args[0])
-	}
-
-	args.ec.setOrDefineVar(name, newVal)
-	return newVal, nil
-}
-
 func eqBuiltin(ctx context.Context, args invocationArgs) (Object, error) {
 	if err := args.expectArgn(2); err != nil {
 		return nil, err
diff --git a/ucl/inst.go b/ucl/inst.go
index 9484809..585bea3 100644
--- a/ucl/inst.go
+++ b/ucl/inst.go
@@ -57,8 +57,6 @@ func New(opts ...InstOption) *Inst {
 	rootEC.root = rootEC
 
 	rootEC.addCmd("echo", invokableFunc(echoBuiltin))
-	rootEC.addCmd("set", invokableFunc(setBuiltin))
-	rootEC.addCmd("set!", invokableFunc(mustSetBuiltin))
 	rootEC.addCmd("len", invokableFunc(lenBuiltin))
 	rootEC.addCmd("index", invokableFunc(indexBuiltin))
 	rootEC.addCmd("call", invokableFunc(callBuiltin))