diff --git a/CHANGELOG b/CHANGELOG
index 07c7d9b337..c37e975695 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,60 @@
 Change Log for Releases
 ==============================
 
+## 004.006.000.000
+* ci
+  - only build docker images once per week
+  - propagate testLength to RF ATS
+  - replace deprecated ruamel.yaml methods
+  - use build farm for windows builds
+* deb
+  - copyright file update to eliminate errors and warnings
+* docs
+  - X440: Add FBX to daughterboard list
+  - X440: Corrected web link syntax in FBX doc.
+  - x440: Add X440_X4_200 to image flavors
+* examples
+  - L band capture example using dual rate
+* fpga
+  - ci: Add X440_X4_200 to pipelines
+  - lib: Allow buffering in eth_ipv4_chdr_adapter
+  - n3xx: Add CE clock
+  - rfnoc: Add clock info to backend ifc
+  - rfnoc: radio: Add clock index parameters
+  - tools: Add X440_X4_200 to X440 package
+  - x400: Add CE clock
+  - x400: Add X440 200 MHz variant
+  - x400: Split DRAM interface into two banks
+  - x400: Split DRAM interface on X440_X4_200
+  - x400: Update PL DRAM speed bin
+  - x400: bump minor revision
+  - x400: pps_sync cleanup
+  - x400: propagate pps_sync changes
+  - x400: update signals to run on two domains
+  - x440: cpld: led control cleanup
+  - x440: remove extra synchronizer
+* images
+  - bump x4xx fpga images
+  - bump x4xx fpga images
+  - update non-x4xx images
+* lib
+  - rfnoc: Add clock info fields to client zero
+  - rfnoc: Add support for auto-clock discovery
+  - x4xx: Use auto clock ID in x400_radio_control
+* mpm
+  - Add LUT for def. MCR per DSP bandwidth
+  - Disable MTS completely for dual rate
+  - x400: Align FPGA revision
+  - x400: match HDL PPS updates
+  - fix timekeeper misalignment
+* rfnoc
+  - Enable SEP throttle register
+  - image builder: Add clock index support to image builder
+* utils
+  - init device with gpsdo sources in query_gpsdo_sensors
+* x4xx
+  - Add support for auto clock ID
+
 ## 004.005.000.000
 * b200
   - Fix invalid RF switch positions
diff --git a/host/cmake/Modules/UHDVersion.cmake b/host/cmake/Modules/UHDVersion.cmake
index dd6829b553..971c03a3fc 100644
--- a/host/cmake/Modules/UHDVersion.cmake
+++ b/host/cmake/Modules/UHDVersion.cmake
@@ -20,7 +20,7 @@ find_package(Git QUIET)
 #  - set UHD_VERSION_DEVEL to true for master and development branches
 ########################################################################
 set(UHD_VERSION_MAJOR 4)
-set(UHD_VERSION_API   5)
+set(UHD_VERSION_API   6)
 set(UHD_VERSION_ABI   0)
 set(UHD_VERSION_PATCH 0)
 set(UHD_VERSION_DEVEL TRUE)
diff --git a/host/cmake/debian/changelog b/host/cmake/debian/changelog
index 397fbfb297..7f835972e4 100644
--- a/host/cmake/debian/changelog
+++ b/host/cmake/debian/changelog
@@ -1,3 +1,61 @@
+uhd (4.6.0.0-0ubuntu1) ubuntu_release; urgency=low
+
+  * ci
+    - only build docker images once per week
+    - propagate testLength to RF ATS
+    - replace deprecated ruamel.yaml methods
+    - use build farm for windows builds
+  * deb
+    - copyright file update to eliminate errors and warnings
+  * docs
+    - X440: Add FBX to daughterboard list
+    - X440: Corrected web link syntax in FBX doc.
+    - x440: Add X440_X4_200 to image flavors
+  * examples
+    - L band capture example using dual rate
+  * fpga
+    - ci: Add X440_X4_200 to pipelines
+    - lib: Allow buffering in eth_ipv4_chdr_adapter
+    - n3xx: Add CE clock
+    - rfnoc: Add clock info to backend ifc
+    - rfnoc: radio: Add clock index parameters
+    - tools: Add X440_X4_200 to X440 package
+    - x400: Add CE clock
+    - x400: Add X440 200 MHz variant
+    - x400: Split DRAM interface into two banks
+    - x400: Split DRAM interface on X440_X4_200
+    - x400: Update PL DRAM speed bin
+    - x400: bump minor revision
+    - x400: pps_sync cleanup
+    - x400: propagate pps_sync changes
+    - x400: update signals to run on two domains
+    - x440: cpld: led control cleanup
+    - x440: remove extra synchronizer
+  * images
+    - bump x4xx fpga images
+    - bump x4xx fpga images
+    - update non-x4xx images
+  * lib
+    - rfnoc: Add clock info fields to client zero
+    - rfnoc: Add support for auto-clock discovery
+    - x4xx: Use auto clock ID in x400_radio_control
+  * mpm
+    - Add LUT for def. MCR per DSP bandwidth
+    - Disable MTS completely for dual rate
+    - x400: Align FPGA revision
+    - x400: match HDL PPS updates
+    - fix timekeeper misalignment
+  * rfnoc
+    - Enable SEP throttle register
+    - image builder: Add clock index support to image builder
+  * utils
+    - init device with gpsdo sources in query_gpsdo_sensors
+  * x4xx
+    - Add support for auto clock ID
+
+ -- Ettus Research <packages@ettus.com>  Mon, 30 Oct 2023 11:41:37 -0800
+
+
 uhd (4.5.0.0-0ubuntu1) ubuntu_release; urgency=low
 
   * b200
diff --git a/host/cmake/debian/control b/host/cmake/debian/control
index 4c79440994..30ce701b03 100644
--- a/host/cmake/debian/control
+++ b/host/cmake/debian/control
@@ -32,7 +32,7 @@ Vcs-Git: https://github.com/EttusResearch/uhd.git
 
 Package: uhd-host
 Architecture: any
-Depends: libuhd4.5.0 (= ${binary:Version}),
+Depends: libuhd4.6.0 (= ${binary:Version}),
          python3,
          python3-mako,
          python3-numpy,
@@ -55,7 +55,7 @@ Description: hardware driver for Ettus Research products - host apps
  display hardware configuration information, and Doxygen generated
  documentation.
 
-Package: libuhd4.5.0
+Package: libuhd4.6.0
 Architecture: any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
@@ -73,7 +73,7 @@ Description: hardware driver for Ettus Research products
 Package: libuhd-dev
 Architecture: any
 Section: libdevel
-Depends: libuhd4.5.0 (= ${binary:Version}), ${misc:Depends}, ${shlibs:Depends}
+Depends: libuhd4.6.0 (= ${binary:Version}), ${misc:Depends}, ${shlibs:Depends}
 Recommends: gnuradio-dev
 Suggests: uhd-doc
 Description: universal hardware driver for Ettus Research products
@@ -89,7 +89,7 @@ Description: universal hardware driver for Ettus Research products
 Package: python3-uhd
 Architecture: alpha amd64 arm64 armel armhf hppa i386 ia64 m68k mips64el ppc64 ppc64el riscv64 s390x sparc64 x32
 Section: libdevel
-Depends: libuhd4.5.0 (= ${binary:Version}),
+Depends: libuhd4.6.0 (= ${binary:Version}),
          python3,
          python3-mako,
          python3-numpy,
diff --git a/host/cmake/debian/libuhd4.5.0.install b/host/cmake/debian/libuhd4.6.0.install
similarity index 100%
rename from host/cmake/debian/libuhd4.5.0.install
rename to host/cmake/debian/libuhd4.6.0.install
diff --git a/host/cmake/debian/rules b/host/cmake/debian/rules
index 543ba9a949..e7a8bf0aac 100755
--- a/host/cmake/debian/rules
+++ b/host/cmake/debian/rules
@@ -53,7 +53,7 @@ override_dh_acc:
 	- cat logs/libuhd-dev/*/log.txt
 
 override_dh_shlibdeps:
-	dh_shlibdeps --package=uhd-host --libpackage=libuhd4.5.0
-	dh_shlibdeps --package=libuhd4.5.0 --libpackage=libuhd4.5.0
-	dh_shlibdeps --package=libuhd-dev --libpackage=libuhd4.5.0
-	dh_shlibdeps --package=python3-uhd --libpackage=libuhd4.5.0
+	dh_shlibdeps --package=uhd-host --libpackage=libuhd4.6.0
+	dh_shlibdeps --package=libuhd4.6.0 --libpackage=libuhd4.6.0
+	dh_shlibdeps --package=libuhd-dev --libpackage=libuhd4.6.0
+	dh_shlibdeps --package=python3-uhd --libpackage=libuhd4.6.0
diff --git a/images/manifest.txt b/images/manifest.txt
index 54bf3390c6..7558830638 100644
--- a/images/manifest.txt
+++ b/images/manifest.txt
@@ -9,9 +9,9 @@ x4xx_zbx_cpld_default           uhd-8d022b3       x4xx/uhd-8d022b3/x4xx_zbx_cpld
 x4xx_x440_fpga_default          uhd-e7ff542       x4xx/uhd-e7ff542/x4xx_x440_fpga_default-ge7ff542.zip       e420094efe9f6b47832fd16746a356f826fa8c682751a0cb9fbb158c4b93f65b
 x4xx_x440_cpld_default          uhd-f5bb3e0       x4xx/uhd-f5bb3e0/x4xx_x440_cpld_default-gf5bb3e0.zip       1c929c125b868bac47e027e4351ca8f3cbafc8ea517fff24693a1801955eb4db
 # X410-Series Filesystems
-x4xx_common_sdk_default         meta-ettus-v4.5.0.0  x4xx/meta-ettus-v4.5.0.0/x4xx_common_sdk_default-v4.5.0.0.zip       0
-x4xx_common_mender_default      meta-ettus-v4.5.0.0  x4xx/meta-ettus-v4.5.0.0/x4xx_common_mender_default-v4.5.0.0.zip    0
-x4xx_common_sdimg_default       meta-ettus-v4.5.0.0  x4xx/meta-ettus-v4.5.0.0/x4xx_common_sdimg_default-v4.5.0.0.zip     0
+x4xx_common_sdk_default         meta-ettus-v4.6.0.0-rc1  x4xx/meta-ettus-v4.6.0.0-rc1/x4xx_common_sdk_default-v4.6.0.0-rc1.zip       0
+x4xx_common_mender_default      meta-ettus-v4.6.0.0-rc1  x4xx/meta-ettus-v4.6.0.0-rc1/x4xx_common_mender_default-v4.6.0.0-rc1.zip    0
+x4xx_common_sdimg_default       meta-ettus-v4.6.0.0-rc1  x4xx/meta-ettus-v4.6.0.0-rc1/x4xx_common_sdimg_default-v4.6.0.0-rc1.zip     0
 
 # X300-Series
 x3xx_x310_fpga_default          uhd-0790f58       x3xx/uhd-0790f58/x3xx_x310_fpga_default-g0790f58.zip                  b6e1b4ad7007836074add5730bd3ee9b06e3555120e383b0c3914a61a18d0cb1
@@ -26,16 +26,16 @@ e3xx_e310_sg3_fpga_default      uhd-0790f58       e3xx/uhd-0790f58/e3xx_e310_sg3
 e3xx_e320_fpga_default          uhd-0790f58       e3xx/uhd-0790f58/e3xx_e320_fpga_default-g0790f58.zip                 9976cee010814a59cddfc9a2bd5ca33c4f2df1a21ceecc1929fb1704a997cccf
 
 # E310 Filesystems
-e3xx_e310_sdk_default         meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e310_sdk_default-v4.5.0.0.zip       0
-e3xx_e310_sg1_mender_default  meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e310_sg1_mender_default-v4.5.0.0.zip    0
-e3xx_e310_sg1_sdimg_default   meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e310_sg1_sdimg_default-v4.5.0.0.zip     0
-e3xx_e310_sg3_mender_default  meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e310_sg3_mender_default-v4.5.0.0.zip    0
-e3xx_e310_sg3_sdimg_default   meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e310_sg3_sdimg_default-v4.5.0.0.zip     0
+e3xx_e310_sdk_default         meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e310_sdk_default-v4.6.0.0-rc1.zip       0
+e3xx_e310_sg1_mender_default  meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e310_sg1_mender_default-v4.6.0.0-rc1.zip    0
+e3xx_e310_sg1_sdimg_default   meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e310_sg1_sdimg_default-v4.6.0.0-rc1.zip     0
+e3xx_e310_sg3_mender_default  meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e310_sg3_mender_default-v4.6.0.0-rc1.zip    0
+e3xx_e310_sg3_sdimg_default   meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e310_sg3_sdimg_default-v4.6.0.0-rc1.zip     0
 
 # E320 Filesystems, etc
-e3xx_e320_sdk_default         meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e320_sdk_default-v4.5.0.0.zip       0
-e3xx_e320_mender_default      meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e320_mender_default-v4.5.0.0.zip    0
-e3xx_e320_sdimg_default       meta-ettus-v4.5.0.0  e3xx/meta-ettus-v4.5.0.0/e3xx_e320_sdimg_default-v4.5.0.0.zip     0
+e3xx_e320_sdk_default         meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e320_sdk_default-v4.6.0.0-rc1.zip       0
+e3xx_e320_mender_default      meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e320_mender_default-v4.6.0.0-rc1.zip    0
+e3xx_e320_sdimg_default       meta-ettus-v4.6.0.0-rc1  e3xx/meta-ettus-v4.6.0.0-rc1/e3xx_e320_sdimg_default-v4.6.0.0-rc1.zip     0
 
 # N300-Series
 n3xx_n310_fpga_default          uhd-0790f58         n3xx/uhd-0790f58/n3xx_n310_fpga_default-g0790f58.zip                f354eb0142e6d5369dcd8b38c4570eef2596e4584380b561a1af2c3c490a32d1
@@ -46,9 +46,9 @@ n3xx_n320_cpld_default          uhd-739b37b         n3xx/uhd-739b37b/n3xx_n320_c
 # N3XX Mykonos firmware
 #n3xx_n310_fw_default           fpga-6bea23d        n3xx/fpga-6bea23d/n3xx_n310_fw_default-g6bea23d.zip                     0
 # N300-Series Filesystems, etc
-n3xx_common_sdk_default         meta-ettus-v4.5.0.0  n3xx/meta-ettus-v4.5.0.0/n3xx_common_sdk_default-v4.5.0.0.zip       0
-n3xx_common_mender_default      meta-ettus-v4.5.0.0  n3xx/meta-ettus-v4.5.0.0/n3xx_common_mender_default-v4.5.0.0.zip    0
-n3xx_common_sdimg_default       meta-ettus-v4.5.0.0  n3xx/meta-ettus-v4.5.0.0/n3xx_common_sdimg_default-v4.5.0.0.zip     0
+n3xx_common_sdk_default         meta-ettus-v4.6.0.0-rc1  n3xx/meta-ettus-v4.6.0.0-rc1/n3xx_common_sdk_default-v4.6.0.0-rc1.zip       0
+n3xx_common_mender_default      meta-ettus-v4.6.0.0-rc1  n3xx/meta-ettus-v4.6.0.0-rc1/n3xx_common_mender_default-v4.6.0.0-rc1.zip    0
+n3xx_common_sdimg_default       meta-ettus-v4.6.0.0-rc1  n3xx/meta-ettus-v4.6.0.0-rc1/n3xx_common_sdimg_default-v4.6.0.0-rc1.zip     0
 
 # B200-Series
 b2xx_b200_fpga_default          uhd-92c09f7       b2xx/uhd-92c09f7/b2xx_b200_fpga_default-g92c09f7.zip               8df8872fb383738b9fc0e83eb5166b080662e54681d191274e19e1a8b291df23