diff --git a/README.md b/README.md
index 9bbc474d3f63..b20e3f301b26 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ This repository is the home of the next generation of JUnit, _JUnit 5_.
 
 - General Availability (GA): [JUnit 5.4.1](https://github.com/junit-team/junit5/releases/tag/r5.4.1)
 (March 17, 2019).
-- Preview (Milestone/Release Candidate): N/A
+- Preview (Milestone/Release Candidate): [JUnit 5.5.0-M1](https://github.com/junit-team/junit5/releases/tag/r5.5.0-M1) (March 19, 2019).
 
 ## Documentation
 
@@ -84,7 +84,7 @@ See also <https://repo1.maven.org/maven2/org/junit/> for releases and <https://o
 ### JUnit Platform
 
 - **Group ID**: `org.junit.platform`
-- **Version**: `1.4.1` or `1.5.0-SNAPSHOT`
+- **Version**: `1.4.1`, `5.5.0-M1`, or `1.5.0-SNAPSHOT`
 - **Artifact IDs** and **Automatic-Module-Name**:
   - `junit-platform-commons` (`org.junit.platform.commons`)
   - `junit-platform-console` (`org.junit.platform.console`)
@@ -99,7 +99,7 @@ See also <https://repo1.maven.org/maven2/org/junit/> for releases and <https://o
 ### JUnit Jupiter
 
 - **Group ID**: `org.junit.jupiter`
-- **Version**: `5.4.1` or `5.5.0-SNAPSHOT`
+- **Version**: `5.4.1`, `5.5.0-M1`, or `5.5.0-SNAPSHOT`
 - **Artifact IDs** and **Automatic-Module-Name**:
   - `junit-jupiter` (`org.junit.jupiter`)
   - `junit-jupiter-api` (`org.junit.jupiter.api`)
@@ -110,7 +110,7 @@ See also <https://repo1.maven.org/maven2/org/junit/> for releases and <https://o
 ### JUnit Vintage
 
 - **Group ID**: `org.junit.vintage`
-- **Version**: `5.4.1` or `5.5.0-SNAPSHOT`
+- **Version**: `5.4.1`, `5.5.0-M1`, or `5.5.0-SNAPSHOT`
 - **Artifact ID** and **Automatic-Module-Name**:
   - `junit-vintage-engine` (`org.junit.vintage.engine`)
 
@@ -118,7 +118,7 @@ See also <https://repo1.maven.org/maven2/org/junit/> for releases and <https://o
 
 - **Group ID**: `org.junit`
 - **Artifact ID** `junit-bom`
-- **Version**: `5.4.1` or `5.5.0-SNAPSHOT`
+- **Version**: `5.4.1`, `5.5.0-M1`, or `5.5.0-SNAPSHOT`
 
 ## Java Module Names
 
diff --git a/documentation/src/docs/asciidoc/release-notes/release-notes-5.5.0-M1.adoc b/documentation/src/docs/asciidoc/release-notes/release-notes-5.5.0-M1.adoc
index 4eb816d864a5..1be6f61effa1 100644
--- a/documentation/src/docs/asciidoc/release-notes/release-notes-5.5.0-M1.adoc
+++ b/documentation/src/docs/asciidoc/release-notes/release-notes-5.5.0-M1.adoc
@@ -1,9 +1,9 @@
 [[release-notes-5.5.0-M1]]
 == 5.5.0-M1
 
-*Date of Release:* ❓
+*Date of Release:* March 19, 2019
 
-*Scope:* ❓
+*Scope:* Configurable test discovery implementation
 
 For a complete list of all _closed_ issues and pull requests for this release, consult the
 link:{junit5-repo}+/milestone/34?closed=1+[5.5 M1] milestone page in the JUnit repository
@@ -13,14 +13,6 @@ on GitHub.
 [[release-notes-5.5.0-M1-junit-platform]]
 === JUnit Platform
 
-==== Bug Fixes
-
-* ❓
-
-==== Deprecations and Breaking Changes
-
-* ❓
-
 ==== New Features and Improvements
 
 * Configurable test discovery implementation that can be reused by different test engines
@@ -33,14 +25,6 @@ on GitHub.
 [[release-notes-5.5.0-M1-junit-jupiter]]
 === JUnit Jupiter
 
-==== Bug Fixes
-
-* ❓
-
-==== Deprecations and Breaking Changes
-
-* ❓
-
 ==== New Features and Improvements
 
 * Supply expected and actual values for failed boolean assertions for enhanced IDE
@@ -50,14 +34,4 @@ on GitHub.
 [[release-notes-5.5.0-M1-junit-vintage]]
 === JUnit Vintage
 
-==== Bug Fixes
-
-* ❓
-
-==== Deprecations and Breaking Changes
-
-* ❓
-
-==== New Features and Improvements
-
-* ❓
+No changes.
diff --git a/gradle.properties b/gradle.properties
index 5e65a7a6be50..5e44f01620cb 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,13 +1,13 @@
 group           = org.junit
-version         = 5.5.0-SNAPSHOT
+version         = 5.5.0-M1
 
 jupiterGroup    = org.junit.jupiter
 
 platformGroup   = org.junit.platform
-platformVersion = 1.5.0-SNAPSHOT
+platformVersion = 1.5.0-M1
 
 vintageGroup    = org.junit.vintage
-vintageVersion  = 5.5.0-SNAPSHOT
+vintageVersion  = 5.5.0-M1
 
 defaultBuiltBy  = JUnit Team
 releaseBranch   = master