diff --git a/INFO.txt b/INFO.txt
index 321f466..1fe11e1 100644
--- a/INFO.txt
+++ b/INFO.txt
@@ -1,4 +1,4 @@
-MEAP version 1.2.1
+MEAP version 1.5.3a
 
     Copyright (C) 2014 Matthew Cieslak and Will Ryan
 
diff --git a/meap/__init__.py b/meap/__init__.py
index 45889cf..2ae53e3 100644
--- a/meap/__init__.py
+++ b/meap/__init__.py
@@ -19,7 +19,7 @@
 SEARCH_WINDOW=30 #samples
 BLOOD_RESISTIVITY=135. # Ohms cm
 n_regions=0
-__version__= "1.5.3"
+__version__= "1.5.3a"
 
 # MEAP only knows what to do with a couple of signals
 SUPPORTED_SIGNALS=["ecg", "ecg2", "dzdt", "z0", "bp",
diff --git a/packaging/innosetup/meap.iss b/packaging/innosetup/meap.iss
index 862ccdd..ccd45e7 100644
--- a/packaging/innosetup/meap.iss
+++ b/packaging/innosetup/meap.iss
@@ -2,7 +2,7 @@
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
 #define MyAppName "MEAP"
-#define MyAppVersion "1.5.3"
+#define MyAppVersion "1.5.3a"
 #define MyAppPublisher "UCSB Department of Psycholgical and Brain Sciences"
 #define MyAppURL "http://meap.readthedocs.io/en/latest/"
 #define MyAppExeName "MEAP.exe"