diff --git a/com.unity.ml-agents.extensions/package.json b/com.unity.ml-agents.extensions/package.json
index 01ac60f409..9248689f29 100644
--- a/com.unity.ml-agents.extensions/package.json
+++ b/com.unity.ml-agents.extensions/package.json
@@ -5,6 +5,6 @@
   "unity": "2018.4",
   "description": "A source-only package for new features based on ML-Agents",
   "dependencies": {
-    "com.unity.ml-agents": "1.9.0-preview"
+    "com.unity.ml-agents": "2.0.0-exp.1"
   }
 }
diff --git a/com.unity.ml-agents/Runtime/Academy.cs b/com.unity.ml-agents/Runtime/Academy.cs
index aedd14ed81..2f1796f343 100644
--- a/com.unity.ml-agents/Runtime/Academy.cs
+++ b/com.unity.ml-agents/Runtime/Academy.cs
@@ -107,7 +107,7 @@ public class Academy : IDisposable
         /// Unity package version of com.unity.ml-agents.
         /// This must match the version string in package.json and is checked in a unit test.
         /// </summary>
-        internal const string k_PackageVersion = "1.9.0-preview";
+        internal const string k_PackageVersion = "2.0.0-exp.1";
 
         const int k_EditorTrainingPort = 5004;
 
diff --git a/com.unity.ml-agents/package.json b/com.unity.ml-agents/package.json
index 700753daa1..7fd2ddefc7 100755
--- a/com.unity.ml-agents/package.json
+++ b/com.unity.ml-agents/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "1.9.0-preview",
+  "version": "2.0.0-exp.1",
   "unity": "2018.4",
   "description": "Use state-of-the-art machine learning to create intelligent character behaviors in any Unity environment (games, robotics, film, etc.).",
   "dependencies": {
diff --git a/utils/validate_versions.py b/utils/validate_versions.py
index 695650b474..ef4aa245ff 100755
--- a/utils/validate_versions.py
+++ b/utils/validate_versions.py
@@ -85,9 +85,11 @@ def set_version(
             f.write(new_contents)
 
     if csharp_version is not None:
-        package_version = csharp_version + "-preview"
+        package_version = f"{csharp_version}-exp.1"
         if csharp_extensions_version is not None:
-            extension_version = csharp_extensions_version + "-preview"
+            # since this has never been promoted we need to keep
+            # it in preview forever or CI will fail
+            extension_version = f"{csharp_extensions_version}-preview"
         print(
             f"Setting package version to {package_version} in {MLAGENTS_PACKAGE_JSON_PATH}"
             f" and {MLAGENTS_EXTENSIONS_PACKAGE_JSON_PATH}"