diff --git a/Firebase/Core/FIROptions.m b/Firebase/Core/FIROptions.m
index 4f88fc3700..e27d858bf9 100644
--- a/Firebase/Core/FIROptions.m
+++ b/Firebase/Core/FIROptions.m
@@ -43,7 +43,7 @@ NSString *const kFIRIsSignInEnabled = @"IS_SIGNIN_ENABLED";
 NSString *const kFIRLibraryVersionID =
     @"5"     // Major version (one or more digits)
     @"01"    // Minor version (exactly 2 digits)
-    @"01"    // Build number (exactly 2 digits)
+    @"00"    // Build number (exactly 2 digits)
     @"000";  // Fixed "000"
 // Plist file name.
 NSString *const kServiceInfoFileName = @"GoogleService-Info";
diff --git a/FirebaseCore.podspec b/FirebaseCore.podspec
index 3dbf42facc..12f1f2fc98 100644
--- a/FirebaseCore.podspec
+++ b/FirebaseCore.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCore'
-  s.version          = '5.1.1'
+  s.version          = '5.1.0'
   s.summary          = 'Firebase Core for iOS (plus community support for macOS and tvOS)'
 
   s.description      = <<-DESC
@@ -34,6 +34,6 @@ Firebase Core includes FIRApp and FIROptions which provide central configuration
   s.pod_target_xcconfig = {
     'OTHER_CFLAGS' => '-fno-autolink',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
-      'FIRCore_VERSION=' + s.version.to_s + ' Firebase_VERSION=5.6.0'
+      'FIRCore_VERSION=' + s.version.to_s + ' Firebase_VERSION=5.5.0'
   }
 end
diff --git a/FirebaseFirestore.podspec b/FirebaseFirestore.podspec
index 1195a8c871..19ceede63c 100644
--- a/FirebaseFirestore.podspec
+++ b/FirebaseFirestore.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseFirestore'
-  s.version          = '0.13.1'
+  s.version          = '0.13.0'
   s.summary          = 'Google Cloud Firestore for iOS'
 
   s.description      = <<-DESC