diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24ba7d657..ca5df5eb7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,8 +20,16 @@ string(REGEX REPLACE ".*#define[ \t]+ZFP_VERSION_MINOR[ \t]+([0-9]+).*"
     "\\1" ZFP_VERSION_MINOR ${_zfp_h_contents})
 string(REGEX REPLACE ".*#define[ \t]+ZFP_VERSION_PATCH[ \t]+([0-9]+).*"
     "\\1" ZFP_VERSION_PATCH ${_zfp_h_contents})
-set(ZFP_VERSION
-  "${ZFP_VERSION_MAJOR}.${ZFP_VERSION_MINOR}.${ZFP_VERSION_PATCH}")
+string(REGEX REPLACE ".*#define[ \t]+ZFP_VERSION_TWEAK[ \t]+([0-9]+).*"
+    "\\1" ZFP_VERSION_TWEAK ${_zfp_h_contents})
+
+if(${ZFP_VERSION_TWEAK} EQUAL 0)
+  set(ZFP_VERSION
+    "${ZFP_VERSION_MAJOR}.${ZFP_VERSION_MINOR}.${ZFP_VERSION_PATCH}")
+else()
+  set(ZFP_VERSION
+    "${ZFP_VERSION_MAJOR}.${ZFP_VERSION_MINOR}.${ZFP_VERSION_PATCH}.${ZFP_VERSION_TWEAK}")
+endif()
 
 project(ZFP VERSION ${ZFP_VERSION})
 
diff --git a/docs/source/high-level-api.rst b/docs/source/high-level-api.rst
index 1500a1f70..d006baa3f 100644
--- a/docs/source/high-level-api.rst
+++ b/docs/source/high-level-api.rst
@@ -37,14 +37,17 @@ Macros
 .. c:macro:: ZFP_VERSION_MAJOR
 .. c:macro:: ZFP_VERSION_MINOR
 .. c:macro:: ZFP_VERSION_PATCH
+.. c:macro:: ZFP_VERSION_TWEAK
 .. c:macro:: ZFP_VERSION
 .. c:macro:: ZFP_VERSION_STRING
 
   Macros identifying the |zfp| library version.  :c:macro:`ZFP_VERSION` is
-  a single integer constructed from the previous three macros
+  a single integer constructed from the previous four macros
   (see :c:macro:`ZFP_MAKE_VERSION`).  :c:macro:`ZFP_VERSION_STRING` is a
   string literal (see :c:macro:`ZFP_MAKE_VERSION_STRING`).  See also
-  :c:data:`zfp_library_version` and :c:data:`zfp_version_string`.
+  :c:data:`zfp_library_version` and :c:data:`zfp_version_string`.  
+  :c:macro:`ZFP_VERSION_TWEAK` is new as of |zfp| |versionrelease| and used 
+  to mark intermediate develop versions.
 
 ----
 
@@ -59,6 +62,18 @@ Macros
 
 ----
 
+.. c:macro:: ZFP_MAKE_FULLVERSION(major, minor, patch, tweak)
+.. c:macro:: ZFP_MAKE_FULLVERSION_STRING(major, minor, patch, tweak)
+
+  Utility macros for constructing :c:macro:`ZFP_VERSION` and
+  :c:macro:`ZFP_VERSION_STRING`, respectively.  Includes tweak version 
+  used by intermediate develop versions. Available as of
+  |zfp| |versionrelease|, these macros may be used by applications to test
+  for a certain |zfp| version number, e.g.,
+  :code:`#if ZFP_VERSION >= ZFP_MAKE_FULLVERSION(0, 5, 6, 1)`.
+
+----
+
 .. c:macro:: ZFP_CODEC
 
   Macro identifying the version of the compression CODEC.  See also
@@ -66,6 +81,14 @@ Macros
 
 ----
 
+.. c:macro:: ZFP_DEVELOP
+
+  Macro identifying that the current version is an intermediate develop 
+  version as opposed to an official release. Available as of |zfp| 
+  |versionrelease|.
+
+----
+
 .. c:macro:: ZFP_MIN_BITS
 .. c:macro:: ZFP_MAX_BITS
 .. c:macro:: ZFP_MAX_PREC
diff --git a/include/zfp/version.h b/include/zfp/version.h
index 294cc151e..8a428614f 100644
--- a/include/zfp/version.h
+++ b/include/zfp/version.h
@@ -1,37 +1,70 @@
 #ifndef ZFP_VERSION_H
 #define ZFP_VERSION_H
 
+/* library version information */
+#define ZFP_VERSION_MAJOR 0 /* library major version number */
+#define ZFP_VERSION_MINOR 5 /* library minor version number */
+#define ZFP_VERSION_PATCH 5 /* library patch version number */
+#define ZFP_VERSION_TWEAK 0 /* library tweak version number */
+
+#define ZFP_VERSION_RELEASE ZFP_VERSION_MAJOR
+
+/* codec version number (see also zfp_codec_version) */
+#define ZFP_CODEC 5
+
+/* whether this is a full release or intermediate version */
+#define ZFP_DEVELOP 1
+
 /* stringification */
 #define _zfp_str_(x) # x
 #define _zfp_str(x) _zfp_str_(x)
 
 /* macro for generating an integer version identifier */
-#define ZFP_MAKE_VERSION(major, minor, patch) \
-  (((major) << 8) + \
-   ((minor) << 4) + \
-   ((patch) << 0))
+#define ZFP_MAKE_VERSION(major, minor, patch, tweak) \
+  (((major) << 12) + \
+   ((minor) << 8) + \
+   ((patch) << 4) + \
+   ((tweak) << 0))
 
-/* macro for generating a version string */
+/* macros for generating a version string */
 #define ZFP_MAKE_VERSION_STRING(major, minor, patch) \
   _zfp_str(major) "." \
   _zfp_str(minor) "." \
   _zfp_str(patch)
 
-/* library version information */
-#define ZFP_VERSION_MAJOR 0 /* library major version number */
-#define ZFP_VERSION_MINOR 5 /* library minor version number */
-#define ZFP_VERSION_PATCH 5 /* library patch version number */
-#define ZFP_VERSION_RELEASE ZFP_VERSION_PATCH
+#define ZFP_MAKE_VERSION_STRING(major, minor, patch) \
+  _zfp_str(major) "." \
+  _zfp_str(minor) "." \
+  _zfp_str(patch)
 
-/* codec version number (see also zfp_codec_version) */
-#define ZFP_CODEC 5
+#define ZFP_MAKE_FULLVERSION_STRING(major, minor, patch, tweak) \
+  _zfp_str(major) "." \
+  _zfp_str(minor) "." \
+  _zfp_str(patch) "." \
+  _zfp_str(tweak)
+
+#define ZFP_MAKE_FULLVERSION_STRING(major, minor, patch, tweak) \
+  _zfp_str(major) "." \
+  _zfp_str(minor) "." \
+  _zfp_str(patch) "." \
+  _zfp_str(tweak)
 
 /* library version number (see also zfp_library_version) */
-#define ZFP_VERSION \
-  ZFP_MAKE_VERSION(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH)
+#if ZFP_VERSION_TWEAK == 0
+    #define ZFP_VERSION \
+        ZFP_MAKE_VERSION(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH)
+#else
+    #define ZFP_VERSION \
+        ZFP_MAKE_FULLVERSION(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH, ZFP_VERSION_TWEAK)
+#endif
 
 /* library version string (see also zfp_version_string) */
-#define ZFP_VERSION_STRING \
-  ZFP_MAKE_VERSION_STRING(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH)
+#if ZFP_VERSION_TWEAK == 0
+    #define ZFP_VERSION_STRING \
+        ZFP_MAKE_VERSION_STRING(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH)
+#else
+    #define ZFP_VERSION_STRING \
+        ZFP_MAKE_FULLVERSION_STRING(ZFP_VERSION_MAJOR, ZFP_VERSION_MINOR, ZFP_VERSION_PATCH, ZFP_VERSION_TWEAK)
+#endif
 
 #endif
diff --git a/zfp-config-version.cmake.in b/zfp-config-version.cmake.in
index 4a77db0a1..449327023 100644
--- a/zfp-config-version.cmake.in
+++ b/zfp-config-version.cmake.in
@@ -1,6 +1,8 @@
 set(PACKAGE_VERSION_MAJOR @ZFP_VERSION_MAJOR@)
 set(PACKAGE_VERSION_MINOR @ZFP_VERSION_MINOR@)
 set(PACKAGE_VERSION_PATCH @ZFP_VERSION_PATCH@)
+set(PACKAGE_VERSION_TWEAK @ZFP_VERSION_TWEAK@)
+
 set(PACKAGE_VERSION @ZFP_VERSION@)
 
 # Check whether the requested PACKAGE_FIND_VERSION is compatible