diff --git a/CHANGES b/CHANGES
index 9d33f4c6b0..dc714a6b34 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+6.1.0-dev.80 | 2023-06-15 12:15:29 -0700
+
+  * Force -std=c++17 mode for plugin targets, remove use of RequireCXX17.cmake (Tim Wojtulewicz, Corelight)
+
+  * Add Spicy updates to NEWS for 6.0. (Robin Sommer, Corelight)
+
 6.1.0-dev.76 | 2023-06-15 18:36:25 +0200
 
   * plugin/Manager: Warn when plugin with the same name is found (Arne Welzel, Corelight)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4af1e6567..76d720c0b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -188,7 +188,6 @@ add_library(zeek_internal INTERFACE)
 add_library(Zeek::Internal ALIAS zeek_internal)
 set_target_properties(zeek_internal PROPERTIES EXPORT_NAME Internal)
 install(TARGETS zeek_internal EXPORT ZeekTargets)
-target_compile_features(zeek_internal INTERFACE ${ZEEK_CXX_STD})
 
 # Skip "link-time version check" in Plugin.h for plugins that we bake in.
 target_compile_definitions(zeek_internal INTERFACE ZEEK_PLUGIN_SKIP_VERSION_CHECK)
@@ -200,6 +199,8 @@ add_custom_target(zeek_autogen_files)
 # reasons and backwards compatibility).
 if (ZEEK_STANDALONE)
     add_executable(zeek_exe)
+    target_compile_features(zeek_exe PRIVATE ${ZEEK_CXX_STD})
+    set_target_properties(zeek_exe PROPERTIES CXX_EXTENSIONS OFF)
     target_link_libraries(zeek_exe PRIVATE $<BUILD_INTERFACE:zeek_internal>)
     add_dependencies(zeek_exe zeek_autogen_files)
     set_target_properties(zeek_exe PROPERTIES RUNTIME_OUTPUT_NAME zeek)
@@ -238,6 +239,8 @@ endif ()
 # bundles all of our object libraries and other dependencies.
 if (ZEEK_ENABLE_FUZZERS)
     add_library(zeek_fuzzer_shared SHARED)
+    target_compile_features(zeek_fuzzer_shared PRIVATE ${ZEEK_CXX_STD})
+    set_target_properties(zeek_fuzzer_shared PROPERTIES CXX_EXTENSIONS OFF)
     target_link_libraries(zeek_fuzzer_shared PUBLIC $<BUILD_INTERFACE:zeek_internal>)
     # Tell zeek_target_link_libraries to add library dependencies as PUBLIC.
     set(zeek_fuzzer_shared_access PUBLIC)
@@ -284,7 +287,6 @@ target_include_directories(
     zeek_dynamic_plugin_base
     INTERFACE $<INSTALL_INTERFACE:include> $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
               $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>)
-target_compile_features(zeek_dynamic_plugin_base INTERFACE ${ZEEK_CXX_STD})
 add_library(Zeek::DynamicPluginBase ALIAS zeek_dynamic_plugin_base)
 set_target_properties(zeek_dynamic_plugin_base PROPERTIES EXPORT_NAME DynamicPluginBase)
 install(TARGETS zeek_dynamic_plugin_base EXPORT ZeekTargets)
@@ -334,6 +336,8 @@ function (zeek_add_subdir_library name)
     # Create target and add the sources.
     set(target_name "zeek_${name}_obj")
     add_library(${target_name} OBJECT ${FN_ARGS_SOURCES})
+    target_compile_features(${target_name} PRIVATE ${ZEEK_CXX_STD})
+    set_target_properties(${target_name} PROPERTIES CXX_EXTENSIONS OFF)
     target_compile_definitions(${target_name} PRIVATE ZEEK_CONFIG_SKIP_VERSION_H)
     add_dependencies(${target_name} zeek_autogen_files)
     target_link_libraries(${target_name} PRIVATE $<BUILD_INTERFACE:zeek_internal>)
@@ -1056,7 +1060,6 @@ include(PCAPTests)
 include(OpenSSLTests)
 include(CheckNameserCompat)
 include(GetArchitecture)
-include(RequireCXX17)
 include(FindKqueue)
 include(FindCAres)
 include_directories(BEFORE "auxil/out_ptr/include")
diff --git a/VERSION b/VERSION
index d3475505af..d6262ed535 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.1.0-dev.76
+6.1.0-dev.80
diff --git a/cmake b/cmake
index 4c3cd1146e..0840965d6a 160000
--- a/cmake
+++ b/cmake
@@ -1 +1 @@
-Subproject commit 4c3cd1146e9be6d7e04a5978336351b73f82a691
+Subproject commit 0840965d6aaa5a90b1d0979c029d7ce9016fe827
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 413f0639fb..69e3ebc90c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -510,6 +510,8 @@ set(zeek_SRCS
 collect_headers(zeek_HEADERS ${zeek_SRCS})
 
 add_library(zeek_objs OBJECT ${zeek_SRCS})
+target_compile_features(zeek_objs PRIVATE ${ZEEK_CXX_STD})
+set_target_properties(zeek_objs PROPERTIES CXX_EXTENSIONS OFF)
 target_link_libraries(zeek_objs PRIVATE $<BUILD_INTERFACE:zeek_internal>)
 target_compile_definitions(zeek_objs PRIVATE ZEEK_CONFIG_SKIP_VERSION_H)
 add_dependencies(zeek_objs zeek_autogen_files)
diff --git a/src/fuzzers/CMakeLists.txt b/src/fuzzers/CMakeLists.txt
index 5bf6e7b5eb..fec9ab5b4a 100644
--- a/src/fuzzers/CMakeLists.txt
+++ b/src/fuzzers/CMakeLists.txt
@@ -31,6 +31,8 @@ string(REGEX MATCH ".*\\.a$" _have_static_bind_lib "${BIND_LIBRARY}")
 
 macro (SETUP_FUZZ_TARGET _fuzz_target _fuzz_source)
     add_executable(${_fuzz_target} ${_fuzz_source} ${ARGN})
+    target_compile_features(${_fuzz_target} PRIVATE "${ZEEK_CXX_STD}")
+    set_target_properties(${_fuzz_target} PROPERTIES CXX_EXTENSIONS OFF)
     target_link_libraries(${_fuzz_target} zeek_fuzzer_shared)
 
     if (_have_static_bind_lib)
@@ -62,6 +64,8 @@ endmacro ()
 include_directories(BEFORE ${CMAKE_CURRENT_SOURCE_DIR})
 
 add_library(zeek_fuzzer_standalone OBJECT standalone-driver.cc)
+target_compile_features(zeek_fuzzer_standalone PRIVATE "${ZEEK_CXX_STD}")
+set_target_properties(zeek_fuzzer_standalone PROPERTIES CXX_EXTENSIONS OFF)
 
 target_sources(zeek_fuzzer_shared PRIVATE FuzzBuffer.cc)
 
diff --git a/src/spicy/spicyz/CMakeLists.txt b/src/spicy/spicyz/CMakeLists.txt
index 003564af21..f49d8a309f 100644
--- a/src/spicy/spicyz/CMakeLists.txt
+++ b/src/spicy/spicyz/CMakeLists.txt
@@ -5,6 +5,8 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/config.h DESTINATION include/zeek/spic
 
 add_executable(spicyz driver.cc glue-compiler.cc main.cc)
 target_compile_options(spicyz PRIVATE "-Wall")
+target_compile_features(spicyz PRIVATE "${ZEEK_CXX_STD}")
+set_target_properties(spicyz PROPERTIES CXX_EXTENSIONS OFF)
 target_include_directories(spicyz PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 target_link_libraries(spicyz PRIVATE hilti spicy)