diff --git a/src/if_py_both.h b/src/if_py_both.h
index 3643f8be27..5ba443b493 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -635,13 +635,14 @@ PythonIO_Flush(void)
     if (old_fn != NULL && io_ga.ga_len > 0)
     {
 	((char *)io_ga.ga_data)[io_ga.ga_len] = NUL;
+	// We don't know what emsg_severe should be here, so ... hope?
 	old_fn((char *)io_ga.ga_data);
     }
     io_ga.ga_len = 0;
 }
 
     static void
-writer(writefn fn, char_u *str, PyInt n)
+writer(writefn fn, char_u *str, PyInt n, int severe)
 {
     char_u *ptr;
 
@@ -665,6 +666,7 @@ writer(writefn fn, char_u *str, PyInt n)
 
 	mch_memmove(((char *)io_ga.ga_data) + io_ga.ga_len, str, (size_t)len);
 	((char *)io_ga.ga_data)[io_ga.ga_len + len] = NUL;
+	emsg_severe = severe;
 	fn((char *)io_ga.ga_data);
 	str = ptr + 1;
 	n -= len + 1;
@@ -692,9 +694,7 @@ write_output(OutputObject *self, PyObject *string)
 
     Py_BEGIN_ALLOW_THREADS
     Python_Lock_Vim();
-    if (error)
-	emsg_severe = TRUE;
-    writer((writefn)(error ? emsg : msg), (char_u *)str, len);
+    writer((writefn)(error ? emsg : msg), (char_u *)str, len, error);
     Python_Release_Vim();
     Py_END_ALLOW_THREADS
     PyMem_Free(str);
diff --git a/src/if_python3.c b/src/if_python3.c
index 139ec54df6..5d45ba15f3 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -1338,6 +1338,11 @@ Python3_Init(void)
 	    goto fail;
 	}
 #endif
+	// Python 3.13 introduced a really useful feature: colorized exceptions.
+	// This is great if you're reading them from the terminal, but useless
+	// and broken everywhere else (such as in log files, or text editors).
+	// Opt out, forcefully.
+	vim_setenv((char_u*)"PYTHON_COLORS", (char_u*)"0");
 
 	init_structs();
 
diff --git a/src/testdir/test_python3.vim b/src/testdir/test_python3.vim
index 7f04f11ab6..3178cffd6a 100644
--- a/src/testdir/test_python3.vim
+++ b/src/testdir/test_python3.vim
@@ -4029,30 +4029,34 @@ func Test_python3_iter_ref()
       v = create_list()
       base_ref_count = sys.getrefcount(v)
       for el in v:
-          vim.vars['list_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
+        vim.vars['list_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
 
       create_dict = vim.Function('Create_vim_dict')
       v = create_dict()
       base_ref_count = sys.getrefcount(v)
       for el in v:
-          vim.vars['dict_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
+        vim.vars['dict_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
 
       v = vim.buffers
       base_ref_count = sys.getrefcount(v)
       for el in v:
-          vim.vars['bufmap_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
+        vim.vars['bufmap_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
 
       v = vim.options
       base_ref_count = sys.getrefcount(v)
       for el in v:
-          vim.vars['options_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
+        vim.vars['options_iter_ref_count_increase'] = sys.getrefcount(v) - base_ref_count
 
     test_python3_iter_ref()
   EOF
 
   call assert_equal(1, g:list_iter_ref_count_increase)
   call assert_equal(1, g:dict_iter_ref_count_increase)
-  call assert_equal(1, g:bufmap_iter_ref_count_increase)
+  if py3eval('sys.version_info[:2] < (3, 13)')
+    call assert_equal(1, g:bufmap_iter_ref_count_increase)
+  else
+    call assert_equal(0, g:bufmap_iter_ref_count_increase)
+  endif
   call assert_equal(1, g:options_iter_ref_count_increase)
 endfunc
 
diff --git a/src/version.c b/src/version.c
index 2043563288..ec23e70cdb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    784,
 /**/
     783,
 /**/