diff --git a/.github/variables/cpp-sdk-versions.env b/.github/variables/cpp-sdk-versions.env
index 5831dda..e02acde 100644
--- a/.github/variables/cpp-sdk-versions.env
+++ b/.github/variables/cpp-sdk-versions.env
@@ -1,2 +1,2 @@
-sdk=3.10.1
-redis_source=2.1.19
+sdk=3.13.0
+redis_source=2.4.0
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 068a40f..8d39fd5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ["5.1", "5.2", "5.3", "luajit-2.0.5"]
+        version: ["5.1", "5.2", "5.3", "luajit-2.1"]
         package: ${{ fromJSON(needs.rockspecs.outputs.matrix) }}
 
     steps:
diff --git a/.github/workflows/install-lua-sdk.yml b/.github/workflows/install-lua-sdk.yml
index 6680146..ad7d600 100644
--- a/.github/workflows/install-lua-sdk.yml
+++ b/.github/workflows/install-lua-sdk.yml
@@ -23,7 +23,7 @@ on:
           - '5.1'
           - '5.2'
           - '5.3'
-          - 'luajit-2.0.5'
+          - 'luajit-2.1'
         default: '5.3'
       cpp-sdk-version:
         description: "Version of the C++ Server-side SDK."
diff --git a/README.md b/README.md
index a4862a5..63f3844 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ LaunchDarkly overview
 Supported Lua versions
 -----------
 
-This version of the LaunchDarkly SDK is known to be compatible with the Lua 5.1-5.3 interpreter, and LuaJIT 2.0.5.
+This version of the LaunchDarkly SDK is known to be compatible with the Lua 5.1-5.3 interpreter, and LuaJIT 2.1.
 
 Supported C++ server-side SDK versions
 -----------
diff --git a/examples/hello-debian/Dockerfile b/examples/hello-debian/Dockerfile
index b5b6402..11dc14c 100644
--- a/examples/hello-debian/Dockerfile
+++ b/examples/hello-debian/Dockerfile
@@ -4,7 +4,7 @@ FROM debian:bookworm
 ARG VERSION=2.1.3
 # {{ x-release-please-end }}
 
-ARG CPP_SDK_VERSION=3.10.1
+ARG CPP_SDK_VERSION=3.13.0
 
 # For unknown reasons, it appears that boost.json and boost.url aren't included in the
 # libboost-all package.
diff --git a/examples/hello-haproxy/Dockerfile b/examples/hello-haproxy/Dockerfile
index bad2c0a..847ce7a 100644
--- a/examples/hello-haproxy/Dockerfile
+++ b/examples/hello-haproxy/Dockerfile
@@ -4,7 +4,7 @@ FROM ubuntu:22.04
 ARG VERSION=2.1.3
 # {{ x-release-please-end }}
 
-ARG CPP_SDK_VERSION=3.10.1
+ARG CPP_SDK_VERSION=3.13.0
 
 RUN apt-get update && apt-get install -y \
     curl luarocks lua5.3 lua5.3-dev \
diff --git a/examples/hello-nginx/Dockerfile b/examples/hello-nginx/Dockerfile
index e7f14f4..e6c8b1a 100644
--- a/examples/hello-nginx/Dockerfile
+++ b/examples/hello-nginx/Dockerfile
@@ -7,7 +7,7 @@ FROM openresty/openresty:1.21.4.1-0-jammy
 ARG VERSION=2.1.3
 # {{ x-release-please-end }}
 
-ARG CPP_SDK_VERSION=3.10.1
+ARG CPP_SDK_VERSION=3.13.0
 
 RUN apt-get update && apt-get install -y \
     git netbase curl libssl-dev apt-transport-https ca-certificates \
diff --git a/launchdarkly-server-sdk-redis.c b/launchdarkly-server-sdk-redis.c
index 171e5c8..e4f26e7 100644
--- a/launchdarkly-server-sdk-redis.c
+++ b/launchdarkly-server-sdk-redis.c
@@ -56,24 +56,6 @@ static const struct luaL_Reg launchdarkly_functions[] = {
     { NULL, NULL}
 };
 
-#if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
-/*
-** Adapted from Lua 5.2.0
-*/
-static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
-  luaL_checkstack(L, nup+1, "too many upvalues");
-  for (; l->name != NULL; l++) {  /* fill the table with given functions */
-    int i;
-    lua_pushstring(L, l->name);
-    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
-      lua_pushvalue(L, -(nup+1));
-    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
-    lua_settable(L, -(nup + 3));
-  }
-  lua_pop(L, nup);  /* remove upvalues */
-}
-#endif
-
 int
 luaopen_launchdarkly_server_sdk_redis(lua_State *const l)
 {