diff --git a/.github/actions/build-wasm/action.yml b/.github/actions/build-wasm/action.yml
index 3c02a0ab..d1269115 100644
--- a/.github/actions/build-wasm/action.yml
+++ b/.github/actions/build-wasm/action.yml
@@ -4,8 +4,6 @@ runs:
   using: "composite"
   steps:
     - uses: actions/checkout@v3
-      with:
-        submodules: recursive
     - name: Setup Homebrew
       id: set-up-homebrew
       uses: Homebrew/actions/setup-homebrew@master
@@ -24,11 +22,6 @@ runs:
         tar x -zf - -C /opt/homebrew/opt/llvm@18/lib/clang/18*
         curl -sS -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-22/wasi-sysroot-22.0.tar.gz | \
         sudo tar x -zf - -C /opt
-    - name: Install Rust Nightly
-      uses: dtolnay/rust-toolchain@stable
-      with:
-        toolchain: nightly-2024-05-18
-        components: rust-src
     - name: Set environment variable
       shell: bash
       run: |
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index d213c8b9..00000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "sqlite3/powersync-sqlite-core"]
-	path = sqlite3/powersync-sqlite-core
-	url = git@github.com:powersync-ja/powersync-sqlite-core.git
diff --git a/sqlite3/assets/wasm/CMakeLists.txt b/sqlite3/assets/wasm/CMakeLists.txt
index 862a5e2e..87745efc 100644
--- a/sqlite3/assets/wasm/CMakeLists.txt
+++ b/sqlite3/assets/wasm/CMakeLists.txt
@@ -19,14 +19,9 @@ FetchContent_MakeAvailable(sqlite3)
 
 file(DOWNLOAD https://raw.githubusercontent.com/sqlite/sqlite/master/src/test_vfstrace.c "${CMAKE_BINARY_DIR}/vfstrace.c")
 
-get_filename_component(RS_LIB_DIR "${CMAKE_BINARY_DIR}/../../powersync-sqlite-core/" ABSOLUTE)
-set(RS_LIB "powersync")
-set(RS_WASM_TGT "wasm32-wasi")
-set(RS_WASM_TGT_DIR "${RS_LIB_DIR}/target/${RS_WASM_TGT}")
-
-set(RS_RELEASE_OUT "${RS_WASM_TGT_DIR}/wasm/")
-set(RS_RELEASE_OUT_DEPS "${RS_WASM_TGT_DIR}/wasm/deps")
-set(RS_RELEASE_EXTENSION_OUT "${RS_RELEASE_OUT}/powersync-extension.o")
+set(POWERSYNC_VERSION "0.3.0")
+set(POWERSYNC_A "${CMAKE_BINARY_DIR}/libpowersync-wasm.a")
+file(DOWNLOAD "https://github.com/powersync-ja/powersync-sqlite-core/releases/download/v${POWERSYNC_VERSION}/libpowersync-wasm.a" "${POWERSYNC_A}")
 
 # Generate symbols we need to export from the sqlite3.wasm build
 add_custom_command(
@@ -47,7 +42,6 @@ macro(base_sqlite3_target name debug)
     ${CMAKE_CURRENT_SOURCE_DIR}/os_web.c
     ${CMAKE_CURRENT_SOURCE_DIR}/helpers.c
     ${sqlite3_SOURCE_DIR}/sqlite3.c
-    ${RS_RELEASE_EXTENSION_OUT}
   )
   set(flags -Wall -Wextra -Wno-unused-parameter -Wno-unused-function)
 
@@ -71,6 +65,7 @@ macro(base_sqlite3_target name debug)
       -Wl,--import-memory
       --sysroot ${wasi_sysroot}
       ${sources}
+      ${POWERSYNC_A}
       @${CMAKE_CURRENT_BINARY_DIR}/required_symbols.txt
     DEPENDS ${sources} required_symbols
     VERBATIM
@@ -97,31 +92,10 @@ macro(base_sqlite3_target name debug)
   add_custom_target(${name} DEPENDS ${output})
 endmacro()
 
-# Script to use llc to get object code from bytecode
-set(objectcode_script "${CMAKE_CURRENT_BINARY_DIR}/loop_objectcode_script.sh")
-file(WRITE ${objectcode_script}
-  "cd ${RS_RELEASE_OUT_DEPS}\n"
-  "for filename in *.bc; do llc -march=wasm32 -filetype=obj $filename  -o $filename.o; done\n"
-  "wasm-ld -relocatable *.o -o ../powersync-extension.o"
-)
-
-add_custom_target(
-    powersync_core_bytecode
-    COMMAND ${CMAKE_COMMAND} -E env
-    "RUSTFLAGS=--emit=llvm-bc -C linker=true"
-    cargo build -p powersync_loadable --profile wasm --no-default-features --features \"powersync_core/static powersync_core/omit_load_extension sqlite_nostd/static sqlite_nostd/omit_load_extension\" -Z build-std=panic_abort,core,alloc --target ${RS_WASM_TGT}
-    WORKING_DIRECTORY ${RS_LIB_DIR}
-    # Converts bytecode to wasm object files
-    COMMAND sh ${objectcode_script}
-)
-
 base_sqlite3_target(sqlite3_debug true)
 base_sqlite3_target(sqlite3_opt false)
 
-add_dependencies(sqlite3_opt powersync_core_bytecode)
-add_dependencies(sqlite3_debug powersync_core_bytecode)
-
 add_custom_target(output)
 add_custom_command(TARGET output COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_BINARY_DIR}/sqlite3_opt.wasm ${PROJECT_SOURCE_DIR}/../../example/web/sqlite3.wasm)
 add_custom_command(TARGET output COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_BINARY_DIR}/sqlite3_debug.init.wasm ${PROJECT_SOURCE_DIR}/../../example/web/sqlite3.debug.wasm)
-add_dependencies(output sqlite3_debug sqlite3_opt powersync_core_bytecode)
+add_dependencies(output sqlite3_debug sqlite3_opt)
diff --git a/sqlite3/assets/wasm/os_web.c b/sqlite3/assets/wasm/os_web.c
index 63bba641..0463380c 100644
--- a/sqlite3/assets/wasm/os_web.c
+++ b/sqlite3/assets/wasm/os_web.c
@@ -5,12 +5,14 @@
 #include "bridge.h"
 #include "sqlite3.h"
 
-extern int __rust_no_alloc_shim_is_unstable = 0;
 extern int sqlite3_powersync_init(sqlite3 *db, char **pzErrMsg,
                                   const sqlite3_api_routines *pApi);
 
 int sqlite3_os_init(void) {
-  sqlite3_auto_extension((void (*)(void)) & sqlite3_powersync_init);
+  int rc = sqlite3_auto_extension((void (*)(void)) & sqlite3_powersync_init);
+  if (rc != SQLITE_OK) {
+    return rc;
+  }
   return SQLITE_OK;
 }
 
diff --git a/sqlite3/powersync-sqlite-core b/sqlite3/powersync-sqlite-core
deleted file mode 160000
index 053f7fca..00000000
--- a/sqlite3/powersync-sqlite-core
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 053f7fca93945f7fd7491e3c53434d59dd68129f