diff --git a/Makefile b/Makefile
index 6ffd371..a6a3713 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ TOOLCHAIN_SUFFIX ?=
 TOOLCHAIN_TAG ?= devel$(TOOLCHAIN_SUFFIX)
 TOOLCHAIN_CONFIG ?= configs/ct-ng-config$(TOOLCHAIN_SUFFIX)
 CONTAINER_BASE := /opt/cartesi/toolchain$(TOOLCHAIN_SUFFIX)
-KERNEL_VERSION ?= 6.5.9-ctsi-1
+KERNEL_VERSION ?= output-unification-test1
 KERNEL_SRCPATH := linux-$(KERNEL_VERSION).tar.gz
 
 BUILD_ARGS = --build-arg TOOLCHAIN_CONFIG=$(TOOLCHAIN_CONFIG) \
@@ -50,7 +50,7 @@ run-as-root:
 
 # fetch the public cartesi linux sources if none was provided
 $(KERNEL_SRCPATH):
-	@wget -O $@ https://github.com/cartesi/linux/archive/v$(KERNEL_VERSION).tar.gz
+	@wget -O $@ https://github.com/cartesi/linux/archive/$(KERNEL_VERSION).tar.gz
 
 shasumfile: $(KERNEL_SRCPATH)
 	@shasum -a 256 $^ > $@
diff --git a/configs/ct-ng-config b/configs/ct-ng-config
index d961054..a9da885 100644
--- a/configs/ct-ng-config
+++ b/configs/ct-ng-config
@@ -263,7 +263,7 @@ CT_LINUX_PKG_NAME="linux"
 # CT_LINUX_SRC_RELEASE is not set
 # CT_LINUX_SRC_DEVEL is not set
 CT_LINUX_SRC_CUSTOM=y
-CT_LINUX_CUSTOM_LOCATION="/tmp/build/linux-6.5.9-ctsi-1.tar.gz"
+CT_LINUX_CUSTOM_LOCATION="/tmp/build/linux-output-unification-test1.tar.gz"
 CT_LINUX_PATCH_GLOBAL=y
 # CT_LINUX_PATCH_BUNDLED is not set
 # CT_LINUX_PATCH_LOCAL is not set
diff --git a/configs/ct-ng-config-rv64ima-lp64 b/configs/ct-ng-config-rv64ima-lp64
index c5e4fa1..0ddf0a0 100644
--- a/configs/ct-ng-config-rv64ima-lp64
+++ b/configs/ct-ng-config-rv64ima-lp64
@@ -263,7 +263,7 @@ CT_LINUX_PKG_NAME="linux"
 # CT_LINUX_SRC_RELEASE is not set
 # CT_LINUX_SRC_DEVEL is not set
 CT_LINUX_SRC_CUSTOM=y
-CT_LINUX_CUSTOM_LOCATION="/tmp/build/linux-6.5.9-ctsi-1.tar.gz"
+CT_LINUX_CUSTOM_LOCATION="/tmp/build/linux-output-unification-test1.tar.gz"
 CT_LINUX_PATCH_GLOBAL=y
 # CT_LINUX_PATCH_BUNDLED is not set
 # CT_LINUX_PATCH_LOCAL is not set
diff --git a/shasumfile b/shasumfile
index 410f06a..e9c3012 100644
--- a/shasumfile
+++ b/shasumfile
@@ -1 +1 @@
-bfc4d196b90592a2a6bef83ead9e196da6ab6d5978b48ee5e8ccf02913355bc2  linux-6.5.9-ctsi-1.tar.gz
+6d6174f9a432bd8aa5bd84c193761e0782a2d06d41d554e0ab4c07d734cbf8d0  linux-output-unification-test1.tar.gz