diff --git a/install/install-tk.iss b/install/install-tk.iss
index bec10bc0a..dfd49cd67 100644
--- a/install/install-tk.iss
+++ b/install/install-tk.iss
@@ -3,11 +3,11 @@
 ; AppID can never be changed as subsequent installations require the same installation ID each time
 AppID=FHIRToolkit
 AppName=Health Intersections FHIR Toolkit
-AppVerName=FHIRToolkit v3.4.19
+AppVerName=FHIRToolkit v3.4.20
 
 ; compilation control
 OutputDir=..\install\build
-OutputBaseFilename=fhirtoolkit-win64-3.4.19
+OutputBaseFilename=fhirtoolkit-win64-3.4.20
 Compression=lzma2/ultra64
 
 ; 64 bit
@@ -32,11 +32,11 @@ UninstallFilesDir={app}\uninstall
 ; win2000+ add/remove programs support
 AppPublisher=Health Intersections P/L
 AppPublisherURL=http://www.healthintersections.com.au
-AppVersion=3.4.19
+AppVersion=3.4.20
 AppSupportURL=https://github.com/grahamegrieve/fhirserver
 AppUpdatesURL=https://github.com/grahamegrieve/fhirserver
 AppCopyright=Copyright (c) Health Intersections Pty Ltd 2020+
-VersionInfoVersion=3.4.19.0
+VersionInfoVersion=3.4.20.0
 
 ; dialog support
 LicenseFile=..\license
diff --git a/install/install.iss b/install/install.iss
index 40bbd7aa4..498b02685 100644
--- a/install/install.iss
+++ b/install/install.iss
@@ -3,11 +3,11 @@
 ; AppID can never be changed as subsequent installations require the same installation ID each time
 AppID=FHIRServer
 AppName=Health Intersections FHIR Server
-AppVerName=FHIRServer v3.4.19
+AppVerName=FHIRServer v3.4.20
 
 ; compilation control
 OutputDir=..\install\build
-OutputBaseFilename=fhirserver-win64-3.4.19
+OutputBaseFilename=fhirserver-win64-3.4.20
 Compression=lzma2/ultra64
 
 ; 64 bit
@@ -34,11 +34,11 @@ UninstallFilesDir={app}\uninstall
 ; win2000+ add/remove programs support
 AppPublisher=Health Intersections P/L
 AppPublisherURL=http://www.healthintersections.com.au
-AppVersion=3.4.19
+AppVersion=3.4.20
 AppSupportURL=https://github.com/grahamegrieve/fhirserver
 AppUpdatesURL=https://github.com/grahamegrieve/fhirserver
 AppCopyright=Copyright (c) Health Intersections Pty Ltd 2011+
-VersionInfoVersion=3.4.19.0
+VersionInfoVersion=3.4.20.0
 
 ; dialog support
 LicenseFile=..\license
diff --git a/library/version.inc b/library/version.inc
index b9d0c6637..31824aaea 100644
--- a/library/version.inc
+++ b/library/version.inc
@@ -1,3 +1,3 @@
- FHIR_CODE_FULL_VERSION = '3.4.19';
- FHIR_CODE_RELEASE_DATE = '2024-10-03';
- FHIR_CODE_RELEASE_DATETIME = '20241003134003.015Z';
+ FHIR_CODE_FULL_VERSION = '3.4.20';
+ FHIR_CODE_RELEASE_DATE = '2024-10-09';
+ FHIR_CODE_RELEASE_DATETIME = '20241009094205.550Z';
diff --git a/server/fhirconsole.lpi b/server/fhirconsole.lpi
index 47b4e794b..f3c6b3e37 100644
--- a/server/fhirconsole.lpi
+++ b/server/fhirconsole.lpi
@@ -18,7 +18,7 @@
     <VersionInfo>
       <MajorVersionNr Value="3"/>
       <MinorVersionNr Value="4"/>
-      <RevisionNr Value="19"/>
+      <RevisionNr Value="20"/>
       <Attributes pvaDebug="False"/>
     </VersionInfo>
     <BuildModes Count="8">
diff --git a/server/fhirserver.dproj b/server/fhirserver.dproj
index e079b742a..b8314b012 100644
--- a/server/fhirserver.dproj
+++ b/server/fhirserver.dproj
@@ -92,7 +92,7 @@
     <VerInfo_IncludeVerInfo>true</VerInfo_IncludeVerInfo>
     <VerInfo_MajorVer>3</VerInfo_MajorVer>
     <VerInfo_MinorVer>4</VerInfo_MinorVer>
-    <VerInfo_Release>19</VerInfo_Release>
+    <VerInfo_Release>20</VerInfo_Release>
     <VerInfo_Debug>false</VerInfo_Debug>
   </PropertyGroup>
   <PropertyGroup Condition="&apos;$(Base_Win32)&apos;!=&apos;&apos;">
@@ -167,7 +167,7 @@
     <DCC_RangeChecking>true</DCC_RangeChecking>
     <DCC_DebugDCUs>false</DCC_DebugDCUs>
     <VerInfo_MajorVer>3</VerInfo_MajorVer>
-    <VerInfo_Release>19</VerInfo_Release>
+    <VerInfo_Release>20</VerInfo_Release>
     <AppDPIAwarenessMode>none</AppDPIAwarenessMode>
     <VerInfo_MinorVer>4</VerInfo_MinorVer>
     <VerInfo_Debug>false</VerInfo_Debug>
diff --git a/server/fhirserver.lpi b/server/fhirserver.lpi
index 513d58edf..13f2f7e30 100644
--- a/server/fhirserver.lpi
+++ b/server/fhirserver.lpi
@@ -19,7 +19,7 @@
       <UseVersionInfo Value="True"/>
       <MajorVersionNr Value="3"/>
       <MinorVersionNr Value="4"/>
-      <RevisionNr Value="19"/>
+      <RevisionNr Value="20"/>
       <Attributes pvaDebug="False"/>
     </VersionInfo>
     <BuildModes Count="8">
diff --git a/toolkit2/fhirtoolkit.lpi b/toolkit2/fhirtoolkit.lpi
index 59411106d..f1e1c3f99 100644
--- a/toolkit2/fhirtoolkit.lpi
+++ b/toolkit2/fhirtoolkit.lpi
@@ -17,7 +17,7 @@
       <UseVersionInfo Value="True"/>
       <MajorVersionNr Value="3"/>
       <MinorVersionNr Value="4"/>
-      <RevisionNr Value="19"/>
+      <RevisionNr Value="20"/>
       <Attributes pvaDebug="False"/>
     </VersionInfo>
     <BuildModes>