diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b65870..5e39af5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,6 @@ PROJECT(mcmap LANGUAGES CXX VERSION 3.0.1)
 SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 OPTION(DEBUG_BUILD "Debug build" OFF)
-OPTION(SNAPSHOT "Support snapshot versions" OFF)
 
 IF(STATIC_BUILD)
     SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
@@ -63,10 +62,6 @@ ELSE()
     ADD_COMPILE_OPTIONS(-O3)
 ENDIF()
 
-IF(SNAPSHOT)
-    ADD_DEFINITIONS(-DSNAPSHOT_SUPPORT)
-ENDIF()
-
 IF(WIN32)
     # 100M stack + 3.5G heap on windows
     SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:104857600 /HEAP:3758096384")
diff --git a/README.md b/README.md
index 2becef5..9c22d70 100644
--- a/README.md
+++ b/README.md
@@ -222,18 +222,6 @@ cmake .. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DSTATIC_BUILD=1^
 
 You can also download and set up [Ubuntu on windows](https://ubuntu.com/tutorials/tutorial-ubuntu-on-windows#1-overview) then the steps are the same as Linux/Ubuntu.
 
-### Snapshot support
-
-Snapshots are unsupported by default. One can enable support by using the `SNAPSHOT` `CMake` option. In linux/macOS:
-```
-git clone https://github.com/spoutn1k/mcmap
-mkdir -p mcmap/build && cd mcmap/build
-cmake .. -DSNAPSHOT=1
-make -j
-```
-
-On Windows, this will depend on the software you are using to compile `mcmap`.
-
 ## Troubleshooting
 
 ### Compilation fails
diff --git a/src/chunk.cpp b/src/chunk.cpp
index fab70f3..10fd6b5 100644
--- a/src/chunk.cpp
+++ b/src/chunk.cpp
@@ -8,10 +8,7 @@ namespace mcmap {
 
 namespace versions {
 std::map<int, std::function<bool(const nbt::NBT &)>> assert = {
-    {3465, assert_versions::v3465}, {2844, assert_versions::v2844},
-#ifdef SNAPSHOT_SUPPORT
-    {2840, assert_versions::v2840},
-#endif
+    {3458, assert_versions::v3458}, {2844, assert_versions::v2844},
     {1976, assert_versions::v1976}, {1628, assert_versions::v1628},
     {0, assert_versions::catchall},
 };
diff --git a/src/chunk_format_versions/assert.cpp b/src/chunk_format_versions/assert.cpp
index 6ea4e4d..43ffc13 100644
--- a/src/chunk_format_versions/assert.cpp
+++ b/src/chunk_format_versions/assert.cpp
@@ -3,8 +3,8 @@
 namespace mcmap {
 namespace versions {
 namespace assert_versions {
-bool v3465(const nbt::NBT &chunk) {
-  // Snapshot 21w43a
+bool v3458(const nbt::NBT &chunk) {
+  // Minecraft 1.20-pre5, randomly changing things
   return chunk.contains("sections")  // No sections mean no blocks
          && chunk.contains("Status") // Ensure the status is `minecraft:full`
          && chunk["Status"].get<nbt::NBT::tag_string_t>() == "minecraft:full";
@@ -17,16 +17,6 @@ bool v2844(const nbt::NBT &chunk) {
          && chunk["Status"].get<nbt::NBT::tag_string_t>() == "full";
 }
 
-#ifdef SNAPSHOT_SUPPORT
-bool v2840(const nbt::NBT &chunk) {
-  // Snapshot 21w42a
-  return chunk.contains("Level") &&           // Level data is required
-         chunk["Level"].contains("Sections")  // No sections mean no blocks
-         && chunk["Level"].contains("Status") // Ensure the status is `full`
-         && chunk["Level"]["Status"].get<nbt::NBT::tag_string_t>() == "full";
-}
-#endif
-
 bool v1976(const nbt::NBT &chunk) {
   // From 1.14 onwards
   return chunk.contains("Level")                // Level data is required
diff --git a/src/chunk_format_versions/assert.hpp b/src/chunk_format_versions/assert.hpp
index bc94f68..a40c938 100644
--- a/src/chunk_format_versions/assert.hpp
+++ b/src/chunk_format_versions/assert.hpp
@@ -3,14 +3,10 @@
 namespace mcmap {
 namespace versions {
 namespace assert_versions {
-bool v3465(const nbt::NBT &chunk);
+bool v3458(const nbt::NBT &chunk);
 
 bool v2844(const nbt::NBT &chunk);
 
-#ifdef SNAPSHOT_SUPPORT
-bool v2840(const nbt::NBT &chunk);
-#endif
-
 bool v1976(const nbt::NBT &chunk);
 
 bool v1628(const nbt::NBT &chunk);
diff --git a/src/mcmap.cpp b/src/mcmap.cpp
index 06ff741..ac9cb4a 100644
--- a/src/mcmap.cpp
+++ b/src/mcmap.cpp
@@ -184,9 +184,6 @@ std::map<std::string, std::string> compilation_options() {
 #endif
 #ifdef DEBUG_BUILD
       {"Debug", "Enabled"},
-#endif
-#ifdef SNAPSHOT_SUPPORT
-      {"Snapshot compatibility", "Enabled"},
 #endif
   };