diff --git a/artifice/artifice_core/consts.py b/artifice/artifice_core/consts.py
index 11a5970..c9254e3 100644
--- a/artifice/artifice_core/consts.py
+++ b/artifice/artifice_core/consts.py
@@ -187,7 +187,7 @@ def get_resource(filepath):
 
 RAMPART_VERSION = None
 PIRANHA_VERSION = None
-PIRANHA_GUI_VERSION = '1.5.6'
+PIRANHA_GUI_VERSION = '1.5.5'
 
 config = None
 #LOGFILE = None
diff --git a/artifice/linux_build/linux_dist_files/piranhaGUI/control b/artifice/linux_build/linux_dist_files/piranhaGUI/control
index 2b15580..4a14523 100644
--- a/artifice/linux_build/linux_dist_files/piranhaGUI/control
+++ b/artifice/linux_build/linux_dist_files/piranhaGUI/control
@@ -1,5 +1,5 @@
 Package: piranhaGUI
-Version: 1.5.6
+Version: 1.5.5
 Architecture: amd64
 Maintainer: Corey Ansley <c.ansley@ed.ac.uk>
 Description: Graphical interface for bioinformatics tools
diff --git a/artifice/linux_build/version_number b/artifice/linux_build/version_number
index 8428f8c..f6dcc9b 100644
--- a/artifice/linux_build/version_number
+++ b/artifice/linux_build/version_number
@@ -1,3 +1,3 @@
 #!/bin/bash 
 
-VERSION_NUMBER=1.5.6
\ No newline at end of file
+VERSION_NUMBER=1.5.5
\ No newline at end of file
diff --git a/artifice/mac_build/pyinstaller_build/piranhaGUI.spec b/artifice/mac_build/pyinstaller_build/piranhaGUI.spec
index e0f59f9..02285bc 100644
--- a/artifice/mac_build/pyinstaller_build/piranhaGUI.spec
+++ b/artifice/mac_build/pyinstaller_build/piranhaGUI.spec
@@ -26,7 +26,7 @@ exe = EXE(
     a.scripts,
     [],
     exclude_binaries=True,
-    name='piranhaGUIv1.5.6',
+    name='piranhaGUIv1.5.5',
     debug=False,
     bootloader_ignore_signals=False,
     strip=False,
@@ -51,7 +51,7 @@ coll = COLLECT(
 )
 app = BUNDLE(
     coll,
-    name='piranhaGUIv1.5.6.app',
+    name='piranhaGUIv1.5.5.app',
     icon='../../resources/piranha_resized.icns',
     bundle_identifier=None,
 )
diff --git a/artifice/windows_build/dist/piranhaGUI_installer.iss b/artifice/windows_build/dist/piranhaGUI_installer.iss
index bfd9579..af9b2ad 100644
--- a/artifice/windows_build/dist/piranhaGUI_installer.iss
+++ b/artifice/windows_build/dist/piranhaGUI_installer.iss
@@ -4,7 +4,7 @@
 
 [Setup]
 AppName=piranhaGUI
-AppVersion=1.5.6
+AppVersion=1.5.5
 WizardStyle=modern
 DefaultDirName={autopf}\piranhaGUI
 DefaultGroupName=piranhaGUI
@@ -12,7 +12,7 @@ UninstallDisplayIcon={app}\.exe
 Compression=lzma2
 SolidCompression=yes
 OutputDir=.\installer
-OutputBaseFilename=piranhaGUIv1.5.6_installer_windows
+OutputBaseFilename=piranhaGUIv1.5.5_installer_windows
 
 [Tasks]
 Name: desktopicon; Description: "Create a &desktop icon";