diff --git a/stack.yaml b/stack.yaml
index 2558ee00..5ed79d78 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,10 +1,10 @@
-# SPDX-FileCopyrightText: 2018-2020 Serokell <https://serokell.io>
+# SPDX-FileCopyrightText: 2018-2023 Serokell <https://serokell.io>
 #
 # SPDX-License-Identifier: MPL-2.0
 
 # To update hackage and stackage indexes used by CI run:
 # $ niv update hackage.nix; niv update stackage.nix
-resolver: lts-19.13
+resolver: lts-21.13
 
 packages:
 - .
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 429b3b51..a7d30b85 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -34,7 +34,7 @@ packages:
     hackage: nyan-interpolation-0.9.2
 snapshots:
 - completed:
-    sha256: ef98d70e4018bf01feb00ccdcd33ab26d056dbb71b38057c78fdd0d1ec671c85
-    size: 618740
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/13.yaml
-  original: lts-19.13
+    sha256: 8017c7970c2a8a9510c60cc70ac245d59e0c34eb932b91d37af09fe59855d854
+    size: 640038
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/21/13.yaml
+  original: lts-21.13