diff --git a/.gitmodules b/.gitmodules
index 94d28e0..fc6b77e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -76,12 +76,12 @@
 [submodule ".vim/bundle/vim-angry"]
 	path = pack/plugins/start/vim-angry
 	url = https://github.com/b4winckler/vim-angry.git
-[submodule ".vim/bundle/ale"]
-	path = pack/plugins/start/ale
-	url = https://github.com/dense-analysis/ale.git
 [submodule ".vim/bundle/vim-solarized8"]
 	path = pack/plugins/start/vim-solarized8
 	url = https://github.com/lifepillar/vim-solarized8.git
 [submodule ".vim/pack/plugins/start/vim-fugitive"]
 	path = pack/plugins/start/vim-fugitive
 	url = https://github.com/tpope/vim-fugitive.git
+[submodule "pack/plugins/start/coc.nvim"]
+	path = pack/plugins/start/coc.nvim
+	url = https://github.com/neoclide/coc.nvim
diff --git a/coc-settings.json b/coc-settings.json
new file mode 100644
index 0000000..48d591e
--- /dev/null
+++ b/coc-settings.json
@@ -0,0 +1,17 @@
+{
+    "languageserver": {
+        "go": {
+            "command": "gopls",
+            "filetypes": ["go"],
+            "rootPatterns": ["go.mod"],
+            "trace.server": "verbose"
+        },
+        "python": {
+            "command": "pyls",
+            "filetypes": ["python"],
+            "rootPatterns": [],
+            "trace.server": "verbose"
+        }
+    },
+    "suggest.noselect": false
+}
diff --git a/ftplugin/c.vim b/ftplugin/c.vim
index 7555292..ee37997 100644
--- a/ftplugin/c.vim
+++ b/ftplugin/c.vim
@@ -1,6 +1,2 @@
-" ale
-let b:ale_linters = ['ccls']
-let b:ale_set_highlights = 0
-
 " vim-fswitch
 noremap gfs :FSHere<Cr>
diff --git a/ftplugin/cpp.vim b/ftplugin/cpp.vim
index 7555292..ee37997 100644
--- a/ftplugin/cpp.vim
+++ b/ftplugin/cpp.vim
@@ -1,6 +1,2 @@
-" ale
-let b:ale_linters = ['ccls']
-let b:ale_set_highlights = 0
-
 " vim-fswitch
 noremap gfs :FSHere<Cr>
diff --git a/ftplugin/go.vim b/ftplugin/go.vim
index 004b157..aa445a9 100644
--- a/ftplugin/go.vim
+++ b/ftplugin/go.vim
@@ -1,8 +1,5 @@
 setlocal noexpandtab
 
-" ale
-let b:ale_linters = ['gopls']
-
 " vim-argwrap
 let b:argwrap_tail_comma = 1
 
diff --git a/ftplugin/python.vim b/ftplugin/python.vim
deleted file mode 100644
index e3831f5..0000000
--- a/ftplugin/python.vim
+++ /dev/null
@@ -1,2 +0,0 @@
-" ale
-let b:ale_linters = ['pyls']
diff --git a/keymaps.vim b/keymaps.vim
index 5a2fa9a..0aa628f 100644
--- a/keymaps.vim
+++ b/keymaps.vim
@@ -41,14 +41,27 @@ nnoremap k gk
 
 " util
 nnoremap <leader>ig :Guid<cr>
+
+" coc.vim
+nmap <silent> [g <Plug>(coc-diagnostic-prev)
+nmap <silent> ]g <Plug>(coc-diagnostic-next)
+nmap <silent> gd <Plug>(coc-definition)
+nmap <silent> gy <Plug>(coc-type-definition)
+nmap <silent> gi <Plug>(coc-implementation)
+nmap <silent> gr <Plug>(coc-references)
+
+if has('nvim-0.4.0') || has('patch-8.2.0750')
+  nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
+  nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
+  inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
+  inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
+  vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
+  vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
+endif
+
 inoremap <expr><tab> pumvisible() ? '<C-y>' : '<tab>'
 inoremap <expr><cr> pumvisible() ? '<C-e><cr>' : '<cr>'
 
-" ale
-nnoremap gd :ALEGoToDefinition<cr>
-nnoremap gD :ALEGoToTypeDefinition<cr>
-nnoremap gr :ALEFindReferences<cr>
-
 " fzf
 nnoremap <silent><leader>fg :GFiles<cr>
 nnoremap <silent><leader>ff :Files ~<cr>
diff --git a/options.vim b/options.vim
index dbe879c..503faac 100644
--- a/options.vim
+++ b/options.vim
@@ -52,9 +52,16 @@ set tabstop=4
 set ttimeout
 set ttimeoutlen=50
 set ttyfast
+set updatetime=300
 set wildignore+=*/tmp/*
 set wildmenu
 
+if has("nvim-0.5.0") || has("patch-8.1.1564")
+    set signcolumn=number
+else
+    set signcolumn=yes
+endif
+
 if &shell =~ 'bin/fish'
     set shell=/bin/sh
 endif
diff --git a/pack/plugins/start/ale b/pack/plugins/start/ale
deleted file mode 160000
index bee8ecc..0000000
--- a/pack/plugins/start/ale
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit bee8eccb421968d1f2628c15e9f2bfcc3d0418aa
diff --git a/pack/plugins/start/coc.nvim b/pack/plugins/start/coc.nvim
new file mode 160000
index 0000000..1749499
--- /dev/null
+++ b/pack/plugins/start/coc.nvim
@@ -0,0 +1 @@
+Subproject commit 17494990ab110b70aec3d7c97707448c6d3e72c9
diff --git a/plugins.vim b/plugins.vim
index 8619b1d..1bb066d 100644
--- a/plugins.vim
+++ b/plugins.vim
@@ -1,11 +1,3 @@
-" ale
-let g:ale_completion_enabled = 1
-let g:ale_linters_explicit = 1
-let g:ale_cpp_ccls_init_options = {
-    \ 'cacheDirectory': '/tmp/ccls',
-    \ 'cacheFormat': 'binary',
-    \ }
-
 " fzf
 let $FZF_DEFAULT_COMMAND='ag --hidden --ignore .git -f -g "" 2> /dev/null'
 if has('windows')