publishing a null safe stable release (#153)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fdc54f4..de81b95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 4.0.0
+- Publishing a null safe stable release.
+
 ## 4.0.0-nullsafety
 - Updated to support 2.12.0 and null safety.
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 9613c34..42b2e18 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,7 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 
 name: usage
-version: 4.0.0-nullsafety
+version: 4.0.0
 description: A Google Analytics wrapper for command-line, web, and Flutter apps.
 homepage: https://github.com/dart-lang/usage
 
@@ -11,7 +11,7 @@
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  path: ^1.8.0-nullsafety
+  path: ^1.8.0
 
 dev_dependencies:
   pedantic: ^1.9.0