diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9a8bba2..fdacbd98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@
 
 The espeak-ng project is a fork of the espeak project.
 
-### 1.51 (In Development)
+### 1.51
 
 *  Add support for speechPlayer.
 *  Add more tests to check the various parts of espeak-ng.
diff --git a/android/AndroidManifest.xml b/android/AndroidManifest.xml
index 87c44c0f..9074bee6 100644
--- a/android/AndroidManifest.xml
+++ b/android/AndroidManifest.xml
@@ -2,7 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.reecedunn.espeak"
     android:versionCode="20"
-    android:versionName="1.51-dev" >
+    android:versionName="1.51" >
 
     <uses-feature
         android:name="android.hardware.touchscreen"
diff --git a/android/build.gradle b/android/build.gradle
index d67fd7ee..40fff2eb 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -30,7 +30,7 @@ android {
         minSdkVersion 14
         targetSdkVersion 26
         versionCode 20
-        versionName "1.51-dev"
+        versionName "1.51"
     }
 
     sourceSets {
diff --git a/android/jni/include/config.h b/android/jni/include/config.h
index edae8175..396eb79c 100644
--- a/android/jni/include/config.h
+++ b/android/jni/include/config.h
@@ -1,2 +1,2 @@
 // This is created by autoconf on POSIX-compatibe build environments.
-#define PACKAGE_VERSION "1.51-dev"
+#define PACKAGE_VERSION "1.51"
diff --git a/configure.ac b/configure.ac
index 46e50019..09e2cdc5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ([2.63])
-AC_INIT([eSpeak NG], [1.51-dev], [https://github.com/espeak-ng/espeak-ng/issues], [espeak-ng], [https://github.com/espeak-ng/espeak-ng])
+AC_INIT([eSpeak NG], [1.51], [https://github.com/espeak-ng/espeak-ng/issues], [espeak-ng], [https://github.com/espeak-ng/espeak-ng])
 AM_INIT_AUTOMAKE()
 LT_INIT
 
diff --git a/src/windows/config.h b/src/windows/config.h
index 937b67ed..9b8f1dc4 100644
--- a/src/windows/config.h
+++ b/src/windows/config.h
@@ -9,4 +9,4 @@
 #define _CRT_NONSTDC_NO_DEPRECATE
 
 // This is created by autoconf on POSIX-compatibe build environments.
-#define PACKAGE_VERSION "1.51-dev"
+#define PACKAGE_VERSION "1.51"