diff --git a/archive/miniz.c b/archive/miniz.c
index effd6209..65657c55 100644
--- a/archive/miniz.c
+++ b/archive/miniz.c
@@ -42,7 +42,7 @@ static JSValue js_miniz_read(JSContext *js, JSValue self, int argc, JSValue *arg
 {
   size_t len;
   void *data = js_get_blob_data(js, &len, argv[0]);
-  if (data == -1)
+  if (data == (void *)-1)
     return JS_EXCEPTION;
 
   mz_zip_archive *zip = calloc(sizeof(*zip), 1);
@@ -109,7 +109,7 @@ static JSValue js_miniz_compress(JSContext *js, JSValue this_val,
     in_ptr = cstring;
   } else { 
     in_ptr = js_get_blob_data(js, &in_len, argv[0]);
-    if (in_ptr == -1)
+    if (in_ptr == (const void *)-1)
       return JS_EXCEPTION;
   }
 
@@ -153,7 +153,7 @@ static JSValue js_miniz_decompress(JSContext *js,
   /* grab compressed data */
   size_t in_len;
   void  *in_ptr = js_get_blob_data(js, &in_len, argv[0]);
-  if (in_ptr == -1)
+  if (in_ptr == (void *)-1)
     return JS_EXCEPTION;
 
   /* zlib header present → tell tinfl to parse it */
@@ -196,7 +196,7 @@ JSValue js_writer_add_file(JSContext *js, JSValue self, int argc, JSValue *argv)
   
   size_t dataLen;
   void *data = js_get_blob_data(js, &dataLen, argv[1]);
-  if (data == -1) {
+  if (data == (void *)-1) {
     JS_FreeCString(js, pathInZip);
     return JS_EXCEPTION;
   }
diff --git a/crypto.c b/crypto.c
index f10f7afc..184db195 100644
--- a/crypto.c
+++ b/crypto.c
@@ -56,7 +56,7 @@
 static void *get_blob_check_bits(JSContext *js, JSValue val, size_t expected_bits, const char *name) {
     size_t bits;
     void* result = js_get_blob_data_bits(js, &bits, val);
-    if (result == -1) {
+    if (result == (void *)-1) {
         return NULL; // Exception already thrown by js_get_blob_data_bits
     }
 
@@ -70,7 +70,7 @@ static void *get_blob_check_bits(JSContext *js, JSValue val, size_t expected_bit
 // Helper to get any blob data (checking it is a stoned blob)
 static void *get_blob_any(JSContext *js, JSValue val, size_t *out_bits, const char *name) {
     void *result = js_get_blob_data_bits(js, out_bits, val);
-    if (result == -1)
+    if (result == (void *)-1)
         return NULL;
     return result;
 }
diff --git a/internal/fd.c b/internal/fd.c
index f35a5feb..657a80ae 100644
--- a/internal/fd.c
+++ b/internal/fd.c
@@ -40,7 +40,8 @@ static int js2fd(JSContext *ctx, JSValueConst val)
 // Helper function for writing
 static ssize_t js_fd_write_helper(JSContext *js, int fd, JSValue val)
 {
-
+  (void)js; (void)fd; (void)val;
+  return -1;
 }
 
 
@@ -85,7 +86,7 @@ JSC_CCALL(fd_write,
         JS_FreeCString(js, data);
     } else {
         void *data = js_get_blob_data(js, &len, argv[1]);
-        if (data == -1)
+        if (data == (void *)-1)
             return JS_EXCEPTION;
         wrote = write(fd, data, len);
     }
diff --git a/meson.build b/meson.build
index 28ea6cc9..369a008a 100644
--- a/meson.build
+++ b/meson.build
@@ -140,7 +140,7 @@ foreach inc : includes
   includers += include_directories(inc)
 endforeach
 
-qbe_c_args = ['-x', 'c']
+qbe_c_args = ['-x', 'c', '-Wno-deprecated-declarations']
 qbe_lib = static_library('qbe',
   qbe_files,
   include_directories: includers,
diff --git a/net/enet.c b/net/enet.c
index b1eb7b22..e2654ea6 100644
--- a/net/enet.c
+++ b/net/enet.c
@@ -146,7 +146,6 @@ static JSValue js_enet_host_service(JSContext *ctx, JSValueConst this_val, int a
   if (!host) return JS_EXCEPTION;
 
   if (argc < 1 || !JS_IsFunction(argv[0])) return JS_RaiseDisrupt(ctx, "Expected a callback function as first argument");
-  JSValue callback = JS_DupValue(ctx, argv[0]);
 
   double secs;
   JS_ToFloat64(ctx, &secs, argv[1]);
@@ -186,7 +185,6 @@ static JSValue js_enet_host_service(JSContext *ctx, JSValueConst this_val, int a
     JS_FreeValue(ctx, event_obj);
   }
 
-  JS_FreeValue(ctx, callback);
   return JS_NULL;
 }
 
diff --git a/net/http.c b/net/http.c
index dc57603e..674ab227 100644
--- a/net/http.c
+++ b/net/http.c
@@ -226,7 +226,10 @@ static int par_easycurl_to_memory(char const *url, par_byte **data, int *nbytes)
   CFRelease(cfurlRef);
   if (!request) return 0;
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
   CFReadStreamRef stream = CFReadStreamCreateForHTTPRequest(NULL, request);
+#pragma clang diagnostic pop
   CFRelease(request);
   if (!stream) return 0;
 
diff --git a/qop.c b/qop.c
index 9d443f8a..222509ff 100644
--- a/qop.c
+++ b/qop.c
@@ -97,7 +97,7 @@ static int js_qop_ensure_index(JSContext *js, qop_desc *qop) {
 JSC_CCALL(qop_open,
     size_t len;
     void *data = js_get_blob_data(js, &len, argv[0]);
-    if (data == -1)
+    if (data == (void *)-1)
         ret = JS_EXCEPTION;
     else if (!data)
         ret = JS_RaiseDisrupt(js, "Empty blob");
diff --git a/source/cJSON.c b/source/cJSON.c
index 6e4fb0dd..635d9004 100644
--- a/source/cJSON.c
+++ b/source/cJSON.c
@@ -124,7 +124,7 @@ CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item)
 CJSON_PUBLIC(const char*) cJSON_Version(void)
 {
     static char version[15];
-    sprintf(version, "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH);
+    snprintf(version, sizeof(version), "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH);
 
     return version;
 }
@@ -606,22 +606,22 @@ static cJSON_bool print_number(const cJSON * const item, printbuffer * const out
     /* This checks for NaN and Infinity */
     if (isnan(d) || isinf(d))
     {
-        length = sprintf((char*)number_buffer, "null");
+        length = snprintf((char*)number_buffer, sizeof(number_buffer), "null");
     }
     else if(d == (double)item->valueint)
     {
-        length = sprintf((char*)number_buffer, "%d", item->valueint);
+        length = snprintf((char*)number_buffer, sizeof(number_buffer), "%d", item->valueint);
     }
     else
     {
         /* Try 15 decimal places of precision to avoid nonsignificant nonzero digits */
-        length = sprintf((char*)number_buffer, "%1.15g", d);
+        length = snprintf((char*)number_buffer, sizeof(number_buffer), "%1.15g", d);
 
         /* Check whether the original double can be recovered */
         if ((sscanf((char*)number_buffer, "%lg", &test) != 1) || !compare_double((double)test, d))
         {
             /* If not, print with 17 decimal places of precision */
-            length = sprintf((char*)number_buffer, "%1.17g", d);
+            length = snprintf((char*)number_buffer, sizeof(number_buffer), "%1.17g", d);
         }
     }
 
@@ -1055,7 +1055,7 @@ static cJSON_bool print_string_ptr(const unsigned char * const input, printbuffe
                     break;
                 default:
                     /* escape and print as unicode codepoint */
-                    sprintf((char*)output_pointer, "u%04x", *input_pointer);
+                    snprintf((char*)output_pointer, 6, "u%04x", *input_pointer);
                     output_pointer += 4;
                     break;
             }
diff --git a/source/cell.c b/source/cell.c
index 0bb7d4c2..dd4573b6 100644
--- a/source/cell.c
+++ b/source/cell.c
@@ -757,9 +757,9 @@ double cell_random() {
   return (double)buf / 9007199254740992.0;
 }
 
-void cell_trace_sethook(cell_hook)
+void cell_trace_sethook(cell_hook hook)
 {
-
+  (void)hook;
 }
 
 int uncaught_exception(JSContext *js, JSValue v)
diff --git a/source/mach.c b/source/mach.c
index 4d01669b..21797be2 100644
--- a/source/mach.c
+++ b/source/mach.c
@@ -947,6 +947,11 @@ vm_dispatch:
 #ifdef __GNUC__
     /* Computed goto dispatch — each opcode gets its own branch predictor entry */
     /* Use a macro to generate consistent dispatch table entries and labels */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Woverride-init"
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Winitializer-overrides"
+#endif
 #define DT(x) [x] = &&op_##x
     static const void *dispatch_table[256] = {
       [0 ... 255] = &&op_DEFAULT,
@@ -1017,6 +1022,7 @@ vm_dispatch:
       DT(MACH_IS_RECORD), DT(MACH_IS_STONE),
       DT(MACH_LENGTH), DT(MACH_IS_PROXY),
     };
+#pragma GCC diagnostic pop
 #undef DT
 #define VM_DECODE()  do { \
       ctx->reg_current_frame = frame_ref.val; \
diff --git a/source/qjs_actor.c b/source/qjs_actor.c
index 2f40e554..c0f11afe 100644
--- a/source/qjs_actor.c
+++ b/source/qjs_actor.c
@@ -126,8 +126,7 @@ JSC_CCALL(actor_removetimer,
   cell_rt *actor = JS_GetContextOpaque(js);
   uint32_t timer_id;
   JS_ToUint32(js, &timer_id, argv[0]);
-  JSValue removed = actor_remove_timer(actor, timer_id);
-  JS_FreeValue(js, removed);
+  (void)actor_remove_timer(actor, timer_id);
 )
 
 /* Log callback bridge: called from JS_Log, calls ƿit log(channel, [msg, stack])
diff --git a/source/scheduler.c b/source/scheduler.c
index acb4273b..c9c08a1f 100644
--- a/source/scheduler.c
+++ b/source/scheduler.c
@@ -671,7 +671,9 @@ const char *send_message(const char *id, void *msg)
 void actor_turn(cell_rt *actor)
 {
   pthread_mutex_lock(actor->mutex);
+#ifdef ACTOR_TRACE
   int prev_state = actor->state;
+#endif
   actor->state = ACTOR_RUNNING;
 #ifdef ACTOR_TRACE
   fprintf(stderr, "[ACTOR_TRACE] %s: %d -> RUNNING\n",
diff --git a/src/qbe/gvn.c b/src/qbe/gvn.c
index 92ee5eb9..24171502 100644
--- a/src/qbe/gvn.c
+++ b/src/qbe/gvn.c
@@ -43,11 +43,11 @@ static uint gvntbln;
 static Ins *
 gvndup(Ins *i, int insert)
 {
-	uint idx, n;
+	uint idx;
 	Ins *ii;
 
 	idx = ihash(i) % gvntbln;
-	for (n=1;; n++) {
+	for (;;) {
 		ii = gvntbl[idx];
 		if (!ii)
 			break;