diff --git a/CHANGES.md b/CHANGES.md
index 824894e..966e244 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,8 +6,12 @@ Known issues:
   bug](https://github.com/TooTallNate/node-gyp/issues/65).
 
 
-## bunyan 1.3.7 (not yet released)
+## bunyan 1.4.0 (not yet released)
 
+(Bumping minor ver b/c I'm wary of dtrace-provider changes. :)
+
+- [issue #258, pull #259] Update to dtrace-provider 0.5 to fix
+  install and tests on recent io.js versions.
 - safe-json-stringify@1.0.3 changed output, breaking some tests. Fix those.
 
 
diff --git a/Makefile b/Makefile
index be5ce54..082f3ca 100644
--- a/Makefile
+++ b/Makefile
@@ -87,22 +87,37 @@ test: $(NODEUNIT)
 # Note: 'test10' is last so (if all is well) I end up with a binary
 # dtrace-provider build for node 0.10 (my current version).
 .PHONY: testall
-testall: test11 test08 test10
+testall: test22 test20 test18 test012 test08 test010
 
-.PHONY: test11
-test11:
-	@echo "# Test node 0.11.x (with node `$(NODEOPT)/node-0.11/bin/node --version`)"
-	@$(NODEOPT)/node-0.11/bin/node --version
-	PATH="$(NODEOPT)/node-0.11/bin:$(PATH)" make distclean all test
-.PHONY: test10
-test10:
+.PHONY: test22
+test22:
+	@echo "# Test iojs 2.2.x (with node `$(NODEOPT)/iojs-v2.2/bin/node --version`)"
+	@$(NODEOPT)/iojs-v2.2/bin/node --version | grep '^v2\.2\.'
+	#PATH="$(NODEOPT)/iojs-v2.2/bin:$(PATH)" make distclean all test
+.PHONY: test20
+test20:
+	@echo "# Test iojs 2.0.x (with node `$(NODEOPT)/iojs-v2.0/bin/node --version`)"
+	@$(NODEOPT)/iojs-v2.0/bin/node --version | grep '^v2\.0\.'
+	PATH="$(NODEOPT)/iojs-v2.0/bin:$(PATH)" make distclean all test
+.PHONY: test18
+test18:
+	@echo "# Test iojs 1.8.x (with node `$(NODEOPT)/iojs-v1.8/bin/node --version`)"
+	@$(NODEOPT)/iojs-v1.8/bin/node --version | grep '^v1\.8\.'
+	PATH="$(NODEOPT)/iojs-v1.8/bin:$(PATH)" make distclean all test
+.PHONY: test012
+test012:
+	@echo "# Test node 0.12.x (with node `$(NODEOPT)/node-0.12/bin/node --version`)"
+	@$(NODEOPT)/node-0.12/bin/node --version | grep '^v0\.12\.'
+	PATH="$(NODEOPT)/node-0.12/bin:$(PATH)" make distclean all test
+.PHONY: test010
+test010:
 	@echo "# Test node 0.10.x (with node `$(NODEOPT)/node-0.10/bin/node --version`)"
-	@$(NODEOPT)/node-0.10/bin/node --version
+	@$(NODEOPT)/node-0.10/bin/node --version | grep '^v0\.10\.'
 	PATH="$(NODEOPT)/node-0.10/bin:$(PATH)" make distclean all test
 .PHONY: test08
 test08:
 	@echo "# Test node 0.8.x (with node `$(NODEOPT)/node-0.8/bin/node --version`)"
-	@$(NODEOPT)/node-0.8/bin/node --version
+	@$(NODEOPT)/node-0.8/bin/node --version | grep '^v0\.8\.'
 	PATH="$(NODEOPT)/node-0.8/bin:$(PATH)" make distclean all test
 
 
diff --git a/package.json b/package.json
index ed99868..42b833c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bunyan",
-  "version": "1.3.7",
+  "version": "1.4.0",
   "description": "a JSON logging library for node.js services",
   "author": "Trent Mick <trentm@gmail.com> (http://trentm.com)",
   "main": "./lib/bunyan.js",
diff --git a/test/cli.test.js b/test/cli.test.js
index c4076a4..40fd959 100644
--- a/test/cli.test.js
+++ b/test/cli.test.js
@@ -160,10 +160,15 @@ test('simple.log doesnotexist1.log doesnotexist2.log', function (t) {
             //   ENOENT, no such file or directory 'asdf.log'
             // but node v0.6.14:
             //   ENOENT, open 'asdf.log'
-            // Somewhat annoying change.
-            t.equal(stderr,
-                'bunyan: ENOENT, open \'doesnotexist1.log\'\nbunyan: ENOENT, '
-                + 'open \'doesnotexist2.log\'\n');
+            // io.js 2.2 (at least):
+            //   ENOENT: no such file or directory, open 'doesnotexist1.log'
+            var matches = [
+                /^bunyan: ENOENT.*?, open 'doesnotexist1.log'/m,
+                /^bunyan: ENOENT.*?, open 'doesnotexist2.log'/m,
+            ];
+            matches.forEach(function (match) {
+                t.ok(match.test(stderr), 'stderr matches ' + match.toString());
+            });
             t.end();
         }
     );