diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fe4db1ba0..22201cd91 100755
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,12 +18,12 @@ jobs:
         - "--resolver nightly --stack-yaml stack-nightly.yaml"
         - "--resolver lts-21"
         - "--resolver lts-20 --stack-yaml stack-lts-20.yaml"
-        - "--resolver lts-19"
-        - "--resolver lts-18"
+        - "--resolver lts-19 --stack-yaml stack-lts-19.yaml"
+        - "--resolver lts-18 --stack-yaml stack-lts-18.yaml"
 
     steps:
       - name: Clone project
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
 # Getting weird OS X errors...
 #      - name: Cache dependencies
diff --git a/stack-lts-18.yaml b/stack-lts-18.yaml
new file mode 100644
index 000000000..91bd5dbf0
--- /dev/null
+++ b/stack-lts-18.yaml
@@ -0,0 +1,33 @@
+resolver: lts-18
+packages:
+- ./auto-update
+- ./mime-types
+- ./recv
+- ./time-manager
+- ./wai
+- ./wai-app-static
+- ./wai-conduit
+- ./wai-extra
+- ./wai-frontend-monadcgi
+- ./wai-http2-extra
+- ./wai-websockets
+- ./warp
+- ./warp-tls
+flags:
+  wai-extra:
+    build-example: true
+nix:
+  enable: false
+  packages:
+  - fcgi
+  - zlib
+extra-deps:
+  - crypton-0.33
+  - crypton-x509-1.7.6
+  - crypton-x509-store-1.6.9
+  - crypton-x509-validation-1.6.12
+  - http2-5.0.0
+  - network-byte-order-0.1.7
+  - network-control-0.0.2
+  - tls-1.7.0
+  - unix-time-0.4.11
diff --git a/stack-lts-19.yaml b/stack-lts-19.yaml
new file mode 100644
index 000000000..aaffb25b0
--- /dev/null
+++ b/stack-lts-19.yaml
@@ -0,0 +1,43 @@
+resolver: lts-19
+packages:
+- ./auto-update
+- ./mime-types
+- ./recv
+- ./time-manager
+- ./wai
+- ./wai-app-static
+- ./wai-conduit
+- ./wai-extra
+- ./wai-frontend-monadcgi
+- ./wai-http2-extra
+- ./wai-websockets
+- ./warp
+- ./warp-quic
+- ./warp-tls
+flags:
+  wai-extra:
+    build-example: true
+nix:
+  enable: false
+  packages:
+  - fcgi
+  - zlib
+extra-deps:
+  - crypto-token-0.0.2
+  - crypton-0.34
+  - crypton-x509-1.7.6
+  - crypton-x509-store-1.6.9
+  - crypton-x509-system-1.6.7
+  - crypton-x509-validation-1.6.12
+  - fast-logger-3.2.2
+  - http2-5.0.0
+  - http3-0.0.7
+  - memory-0.18.0
+  - network-3.1.4.0
+  - network-byte-order-0.1.7
+  - network-control-0.0.2
+  - network-udp-0.0.0
+  - quic-0.1.12
+  - sockaddr-0.0.1
+  - tls-1.9.0
+  - unix-time-0.4.11
diff --git a/stack-lts-20.yaml b/stack-lts-20.yaml
index 7f6cdc41b..de991d56b 100644
--- a/stack-lts-20.yaml
+++ b/stack-lts-20.yaml
@@ -1,18 +1,19 @@
-resolver: lts-20.26
+resolver: lts-20
 packages:
-- ./recv
 - ./auto-update
 - ./mime-types
+- ./recv
+- ./time-manager
 - ./wai
-- ./wai-extra
-- ./warp
-- ./warp-tls
+- ./wai-conduit
 - ./wai-app-static
+- ./wai-extra
 - ./wai-frontend-monadcgi
 - ./wai-http2-extra
 - ./wai-websockets
-- ./wai-conduit
-- ./time-manager
+- ./warp
+- ./warp-quic
+- ./warp-tls
 flags:
   wai-extra:
     build-example: true
@@ -22,10 +23,22 @@ nix:
   - fcgi
   - zlib
 extra-deps:
-  - crypton-0.33
+  - cgi-3001.5.0.1
+  - crypto-token-0.0.2
+  - crypton-0.34
   - crypton-x509-1.7.6
   - crypton-x509-store-1.6.9
+  - crypton-x509-system-1.6.7
   - crypton-x509-validation-1.6.12
-  - tls-1.8.0
-  - cgi-3001.5.0.1
+  - fast-logger-3.2.2
+  - http2-5.0.0
+  - http3-0.0.7
+  - memory-0.18.0
   - multipart-0.2.1
+  - network-byte-order-0.1.7
+  - network-control-0.0.2
+  - network-udp-0.0.0
+  - quic-0.1.12
+  - sockaddr-0.0.1
+  - tls-1.9.0
+  - unix-time-0.4.11
diff --git a/stack-nightly.yaml b/stack-nightly.yaml
index 2256c9a29..ceb6883b0 100644
--- a/stack-nightly.yaml
+++ b/stack-nightly.yaml
@@ -1,18 +1,19 @@
-resolver: nightly-2023-09-09
+resolver: nightly
 packages:
-- ./recv
 - ./auto-update
 - ./mime-types
+- ./recv
+- ./time-manager
 - ./wai
 - ./wai-extra
-- ./warp
-- ./warp-tls
 - ./wai-app-static
 - ./wai-frontend-monadcgi
 - ./wai-http2-extra
 - ./wai-websockets
 - ./wai-conduit
-- ./time-manager
+- ./warp
+- ./warp-quic
+- ./warp-tls
 flags:
   wai-extra:
     build-example: true
@@ -21,3 +22,11 @@ nix:
   packages:
   - fcgi
   - zlib
+extra-deps:
+  - crypto-token-0.0.2
+  - crypton-0.34
+  - http3-0.0.7
+  - network-udp-0.0.0
+  - quic-0.1.12
+  - sockaddr-0.0.1
+  - tls-1.9.0
diff --git a/stack.yaml b/stack.yaml
index 2dde447ea..935d841d6 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,18 +1,19 @@
-resolver: lts-21.11
+resolver: lts-21.21
 packages:
-- ./recv
 - ./auto-update
 - ./mime-types
+- ./recv
+- ./time-manager
 - ./wai
-- ./wai-extra
-- ./warp
-- ./warp-tls
 - ./wai-app-static
+- ./wai-conduit
+- ./wai-extra
 - ./wai-frontend-monadcgi
 - ./wai-http2-extra
 - ./wai-websockets
-- ./wai-conduit
-- ./time-manager
+- ./warp
+- ./warp-quic
+- ./warp-tls
 flags:
   wai-extra:
     build-example: true
@@ -22,8 +23,16 @@ nix:
   - fcgi
   - zlib
 extra-deps:
-  - crypton-0.33
+  - crypto-token-0.0.2
+  - crypton-0.34
   - crypton-x509-1.7.6
   - crypton-x509-store-1.6.9
+  - crypton-x509-system-1.6.7
   - crypton-x509-validation-1.6.12
-  - tls-1.8.0
+  - http2-5.0.0
+  - http3-0.0.7
+  - network-control-0.0.2
+  - network-udp-0.0.0
+  - quic-0.1.12
+  - sockaddr-0.0.1
+  - tls-1.9.0