diff --git a/Documentation/FEBio_Theory_Manual.lyx b/Documentation/FEBio_Theory_Manual.lyx
index ddcccc191..f70c81cc9 100644
--- a/Documentation/FEBio_Theory_Manual.lyx
+++ b/Documentation/FEBio_Theory_Manual.lyx
@@ -179,11 +179,11 @@ status open
 
 
 \series default
-Theory Manual Version 4.2 
+Theory Manual Version 4.3 
 \end_layout
 
 \begin_layout Date
-Last Updated: June 19, 2023
+Last Updated: August 30, 2023
 \end_layout
 
 \begin_layout Paragraph*
diff --git a/Documentation/FEBio_Theory_Manual.pdf b/Documentation/FEBio_Theory_Manual.pdf
index 04fd5ded0..e73661e9b 100644
Binary files a/Documentation/FEBio_Theory_Manual.pdf and b/Documentation/FEBio_Theory_Manual.pdf differ
diff --git a/Documentation/FEBio_User_Manual.lyx b/Documentation/FEBio_User_Manual.lyx
index 4c053f953..45248c9a5 100644
--- a/Documentation/FEBio_User_Manual.lyx
+++ b/Documentation/FEBio_User_Manual.lyx
@@ -162,13 +162,13 @@ status open
 
 \end_inset
 
-User's Manual Version 4.2
+User's Manual Version 4.3
 \end_layout
 
 \begin_layout Date
 
 \series bold
-Last Updated: June 19, 2023
+Last Updated: August 30, 2023
 \end_layout
 
 \begin_layout Standard
@@ -109122,437 +109122,350 @@ t boundary condition.
 \end_layout
 
 \begin_layout Verbatim
-
 <?xml version="1.0" encoding="ISO-8859-1"?>
 \end_layout
 
 \begin_layout Verbatim
-
 <febio_spec version="4.0">
 \end_layout
 
 \begin_layout Verbatim
-
 	<Module type="solid"/>
 \end_layout
 
 \begin_layout Verbatim
-
 	<Material>
 \end_layout
 
 \begin_layout Verbatim
-
 		<material id="1" name="Material 1" type="neo-Hookean">
 \end_layout
 
 \begin_layout Verbatim
-
 			<density>1.0</density>
 \end_layout
 
 \begin_layout Verbatim
-
 			<E>1</E>
 \end_layout
 
 \begin_layout Verbatim
-
 			<v>0.45</v>
 \end_layout
 
 \begin_layout Verbatim
-
 		</material>
 \end_layout
 
 \begin_layout Verbatim
-
 	</Material>
 \end_layout
 
 \begin_layout Verbatim
-
 	<Mesh>
 \end_layout
 
 \begin_layout Verbatim
-
 		<Nodes>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="1">-2.0,-0.5, 0.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="2">-2.0,-0.5, 1.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="3">-2.0, 0.5, 0.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="4">-2.0, 0.5, 1.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="5"> 2.0,-0.5, 0.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="6"> 2.0,-0.5, 1.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="7"> 2.0, 0.5, 0.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="8"> 2.0, 0.5, 1.0</node>
 \end_layout
 
 \begin_layout Verbatim
-
 		</Nodes>
 \end_layout
 
 \begin_layout Verbatim
-
 		<Elements type="hex8" name="Part1">
 \end_layout
 
 \begin_layout Verbatim
-
 			<elem id="1">1,5,7,3,2,6,8,4</elem>
 \end_layout
 
 \begin_layout Verbatim
-
 		</Elements>
 \end_layout
 
 \begin_layout Verbatim
-
 		<NodeSet name="set1">
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="1"/>
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="2"/>
 \end_layout
 
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 			<node id="3"/>
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 \begin_layout Verbatim
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 			<node id="4"/>
 \end_layout
 
 \begin_layout Verbatim
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 		</NodeSet>
 \end_layout
 
 \begin_layout Verbatim
-
 		<NodeSet name="set2">
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="1"/>
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="2"/>
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="5"/>
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="6"/>
 \end_layout
 
 \begin_layout Verbatim
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 		</NodeSet>
 \end_layout
 
 \begin_layout Verbatim
-
 		<NodeSet name="set3">
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="1"/>
 \end_layout
 
 \begin_layout Verbatim
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 			<node id="3"/>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="5"/>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="7"/>
 \end_layout
 
 \begin_layout Verbatim
-
 		</NodeSet>
 \end_layout
 
 \begin_layout Verbatim
-
 		<NodeSet name="set4">
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="5"/>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="6"/>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="7"/>
 \end_layout
 
 \begin_layout Verbatim
-
 			<node id="8"/>
 \end_layout
 
 \begin_layout Verbatim
-
 		</NodeSet>
 \end_layout
 
 \begin_layout Verbatim
-
 	</Mesh>
 \end_layout
 
 \begin_layout Verbatim
-
 	<MeshDomains>
 \end_layout
 
 \begin_layout Verbatim
-
 		<SolidDomain name="Part1" mat="Material 1"/>
 \end_layout
 
 \begin_layout Verbatim
-
 	</MeshDomains>
 \end_layout
 
 \begin_layout Verbatim
-
 	<Boundary>
 \end_layout
 
 \begin_layout Verbatim
-
 		<bc type="zero displacement" node_set="set1">
 \end_layout
 
 \begin_layout Verbatim
-
 			<dofs>x,y,z</dofs>
 \end_layout
 
 \begin_layout Verbatim
-
 		</bc>
 \end_layout
 
 \begin_layout Verbatim
-
 	</Boundary>
 \end_layout
 
 \begin_layout Verbatim
-
 	<LoadData>
 \end_layout
 
 \begin_layout Verbatim
-
 		<load_controller id="1" type="loadcurve">
 \end_layout
 
 \begin_layout Verbatim
-
 			<points>
 \end_layout
 
 \begin_layout Verbatim
-
 				<point>0,0</point>
 \end_layout
 
 \begin_layout Verbatim
-
 				<point>1,0.1</point>
 \end_layout
 
 \begin_layout Verbatim
-
 			</points>
 \end_layout
 
 \begin_layout Verbatim
-
 		</load_controller>
 \end_layout
 
 \begin_layout Verbatim
-
 	</LoadData>
 \end_layout
 
 \begin_layout Verbatim
-
 	<Step>
 \end_layout
 
 \begin_layout Verbatim
-
 		<step id="1">
 \end_layout
 
 \begin_layout Verbatim
-
 			<Control>
 \end_layout
 
 \begin_layout Verbatim
-
 				<time_steps>10</time_steps>
 \end_layout
 
 \begin_layout Verbatim
-
 				<step_size>0.1</step_size>
 \end_layout
 
 \begin_layout Verbatim
-
 			</Control>
 \end_layout
 
 \begin_layout Verbatim
-
 			<Boundary>
 \end_layout
 
 \begin_layout Verbatim
-
 				<bc type="prescribed displacement" node_set="set4">
 \end_layout
 
 \begin_layout Verbatim
-
 					<dof>x</dof>
 \end_layout
 
 \begin_layout Verbatim
-
 					<scale lc="1">1.0</scale>
 \end_layout
 
 \begin_layout Verbatim
-
 				</bc>
 \end_layout
 
 \begin_layout Verbatim
-
 			</Boundary>
 \end_layout
 
 \begin_layout Verbatim
-
 		</step>
 \end_layout
 
 \begin_layout Verbatim
-
 		<step id="2">
 \end_layout
 
 \begin_layout Verbatim
-
 			<Control>
 \end_layout
 
 \begin_layout Verbatim
-
 				<time_steps>50</time_steps>
 \end_layout
 
 \begin_layout Verbatim
-
 				<step_size>0.5</step_size>
 \end_layout
 
 \begin_layout Verbatim
-
 				<analysis>DYNAMIC</analysis>
 \end_layout
 
 \begin_layout Verbatim
-
 			</Control>
 \end_layout
 
 \begin_layout Verbatim
-
 		</step>
 \end_layout
 
 \begin_layout Verbatim
-
 	</Step>
 \end_layout
 
 \begin_layout Verbatim
-
 </febio_spec>
 \end_layout
 
diff --git a/Documentation/FEBio_User_Manual.pdf b/Documentation/FEBio_User_Manual.pdf
index 1b9ef9ada..51167ed3d 100644
Binary files a/Documentation/FEBio_User_Manual.pdf and b/Documentation/FEBio_User_Manual.pdf differ
diff --git a/Documentation/ReleaseNotes.txt b/Documentation/ReleaseNotes.txt
index 46b0a2df9..420efbf16 100644
--- a/Documentation/ReleaseNotes.txt
+++ b/Documentation/ReleaseNotes.txt
@@ -39,6 +39,51 @@ the FEBio User's Manual for a more detailed description of the new features.
 To report any bugs or request new features, please visit the FEBio forum 
 at https://forums.febio.org/.
 
+===========================================================================
+
+ R E L E A S E   4.3   8/30/2023
+
+===========================================================================
+
+New Features:
+* The "CG-solver" now supports preconditioners (#67)
+* Added fluid supply function to biphasic-FSI materials. 
+* Added Starling fluid supply constitutive model for biphasic-FSI fluid supplies.
+* Implemented nrrd image reader.
+* Added support for storing global data in plot file. By default, PID controller values are now stored to the plot file.
+* Added "mesh_data" plot variable, which allows storing mesh data in the plot file.
+
+Improvements:
+* Added support for reading part lists from feb4 file.
+* Improved error detection in fluid dilatation calculation of FERealVapor.
+* Added check for node ID numbers in linear constraints.
+* Updated default analysis type for biphasic analyses to be TRANSIENT.
+* The "m" parameters of Ogden materials now supports maps.
+* Added support for reading vector of strings as xml tag.
+* Modified default settings for biphasic-solute and multiphasic analyses to be TRANSIENT (instead of STEADY-STATE).
+* Added units for coefficients c1 and c2 of Mooney-Rivlin materials that were missing them.
+* Added units to velocity in fluid normal velocity.
+* Added documentation on CG-solid solver.
+* Added error message when a fixed constraints has no dofs fixed.
+* Now, storing initial line coordinates of line object.
+* Updated some plot variables that were not thread-safe.
+* Added support for domain data stored as FMT_NODE.
+* The Surface-to-surface map is now evaluated at the nodes so that it can be replicated more accurately in a plot variable.
+* Updated error message when the fiber property of a material cannot be found when parsing ElementData section.
+* Added support for .fiber variable in ElementData. (which allows the "old" way of assigning user fiber data to mixture components.)
+
+
+Bug Fixes:
+* Fixed bug in assembling stiffness of linear constraints.
+* Fixed bug in FEBioPlotFile::Open.
+* Fixed bug with assigning maps to array parameters.
+* Fixed issue with model reset.
+* Fixed issue with attributes getting processed twice.
+* Fixed issue with default name for line objects.
+* Fixed issue with initialization of rigid body COM so the correct values are available for PID controllers that reference these parameters.
+* Fixed bug in "fluid surface force" plot variable to update surface area and surface normal at each time point, producing correct results for fluid-FSI problems. Fluid problems not affected.
+
+
 ===========================================================================
 
  R E L E A S E   4.2   6/20/2023
diff --git a/FEBioLib/version.h b/FEBioLib/version.h
index 33696d5b7..5515868ad 100644
--- a/FEBioLib/version.h
+++ b/FEBioLib/version.h
@@ -35,7 +35,7 @@ SOFTWARE.*/
 // SUBSUBVERSION is incremented when bugs are fixed.
 
 #define VERSION			4
-#define SUBVERSION		2
+#define SUBVERSION		3
 #define SUBSUBVERSION	0
 
 ///////////////////////////////////////////////////////////////////////////////