diff --git a/VERSION b/VERSION
index cb0c939a936f142669d38cf1ece330266d730965..aaa0831b0d156760215bb3877d7e8692261b45c8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.2
+0.5.3-dev
diff --git a/spack/package.py b/spack/package.py
index e83c8993b9cc02c3a172414f17784076ba3f65c0..191c5a4d40f22926a24821347e72b4416197de9b 100644
--- a/spack/package.py
+++ b/spack/package.py
@@ -12,11 +12,12 @@ class Arbor(CMakePackage, CudaPackage):
 
     homepage = 'https://arbor-sim.org'
     git      = 'https://github.com/arbor-sim/arbor.git'
-    url      = 'https://github.com/arbor-sim/arbor/releases/download/v0.5/arbor-v0.5-full.tar.gz'
+    url      = 'https://github.com/arbor-sim/arbor/releases/download/v0.5.2/arbor-v0.5.2-full.tar.gz'
     maintainers = ['bcumming', 'brenthuisman', 'haampie', 'halfflat']
 
     version('master', branch='master', submodules=True)
-    version('0.5', 'd0c8a4c7f97565d7c30493c66249be794d1dc424de266fc79cecbbf0e313df59', url='https://github.com/arbor-sim/arbor/releases/download/v0.5/arbor-v0.5-full.tar.gz')
+    version('0.5.2', sha256='290e2ad8ca8050db1791cabb6b431e7c0409c305af31b559e397e26b300a115d', url='https://github.com/arbor-sim/arbor/releases/download/v0.5.2/arbor-v0.5.2-full.tar.gz')
+    version('0.5', sha256='d0c8a4c7f97565d7c30493c66249be794d1dc424de266fc79cecbbf0e313df59', url='https://github.com/arbor-sim/arbor/releases/download/v0.5/arbor-v0.5-full.tar.gz')
 
     variant('assertions', default=False, description='Enable arb_assert() assertions in code.')
     variant('doc', default=False, description='Build documentation.')