diff --git a/CHANGELOG.md b/CHANGELOG.md
index bbdcff942..29ae11e15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.5.1
+
+- Fix server subscription logic bug that was leading to memory leak / resource exhaustion in some edge cases.
+
 # 0.5.0
 
 - No changes in SMP server implementation - it is backwards compatible with v0.4.1
diff --git a/package.yaml b/package.yaml
index 828811db9..4f3e66ac7 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: simplexmq
-version: 0.5.0
+version: 0.5.1
 synopsis: SimpleXMQ message broker
 description:  |
   This package includes <./docs/Simplex-Messaging-Server.html server>,
diff --git a/simplexmq.cabal b/simplexmq.cabal
index 554d17f7b..c81835e81 100644
--- a/simplexmq.cabal
+++ b/simplexmq.cabal
@@ -4,10 +4,10 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 3bdb491a0318dc4b53cba4131f192e4c4e17b42e88043495666d1688a1f95443
+-- hash: ff75c96b1b4f19821ceda01f32e8759e89ad661380f324f1ab9eec3d5c223425
 
 name:           simplexmq
-version:        0.5.0
+version:        0.5.1
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                 <./docs/Simplex-Messaging-Client.html client> and
diff --git a/src/Simplex/Messaging/Transport.hs b/src/Simplex/Messaging/Transport.hs
index 10b470c98..39153c39d 100644
--- a/src/Simplex/Messaging/Transport.hs
+++ b/src/Simplex/Messaging/Transport.hs
@@ -222,7 +222,7 @@ major :: SMPVersion -> (Int, Int)
 major (SMPVersion a b _ _) = (a, b)
 
 currentSMPVersion :: SMPVersion
-currentSMPVersion = "0.5.0.0"
+currentSMPVersion = "0.5.1.0"
 
 currentSMPVersionStr :: ByteString
 currentSMPVersionStr = serializeSMPVersion currentSMPVersion