diff --git a/stack.yaml b/stack.yaml
index 36cde159..c794ed3a 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: 'lts-19.17'
+resolver: 'lts-20.10'
 save-hackage-creds: false
 system-ghc: true
 skip-ghc-check: true
@@ -19,5 +19,6 @@ nix:
     - openssh  # for deployment
     - rsync    # for deployment
     - zlib
+    - pkgconfig
 
 extra-deps:
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 9648c3f7..033cf531 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 619161
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/17.yaml
-    sha256: 7f47507fd037228a8d23cf830f5844e1f006221acebdd7cb49f2f5fb561e0546
-  original: lts-19.17
+    size: 649332
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/10.yaml
+    sha256: 17870c63f8041ac17a38096124abeb953cb14d84bfc96deb88f9b24daa97b347
+  original: lts-20.10