diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 `stan` uses [PVP Versioning][1].
 The change log is available [on GitHub][2].
 
+## 0.1.2.1
+
+* Support `clay-0.15` series.
+
+* Support `base64-1.0` series.
+
 ## 0.1.2.0
 
 * Added `runStan`, `getAnalysis`, `getStanConfig`
diff --git a/src/Stan/Observation.hs b/src/Stan/Observation.hs
--- a/src/Stan/Observation.hs
+++ b/src/Stan/Observation.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP #-}
+
 {- |
 Copyright: (c) 2020 Kowainik
 SPDX-License-Identifier: MPL-2.0
@@ -40,6 +42,9 @@
 import Stan.Severity (prettyShowSeverity, severityColour)
 
 import qualified Crypto.Hash.SHA1 as SHA1
+#if MIN_VERSION_base64(1,0,0)
+import qualified Data.Base64.Types
+#endif
 import qualified Data.ByteString.Base64 as Base64
 import qualified Data.ByteString.Char8 as BS
 import qualified Data.HashSet as HS
@@ -269,6 +274,14 @@
     , show (srcSpanStartLine srcSpan) <> ":" <> show (srcSpanStartCol srcSpan)
     ]
 
+#if MIN_VERSION_base64(1,0,0)
+extractBase64 :: Data.Base64.Types.Base64 k a -> a
+extractBase64 = Data.Base64.Types.extractBase64
+#else
+extractBase64 :: a -> a
+extractBase64 = id
+#endif
+
 {- | Hash module name to a short string of length @6@. Hashing
 algorithm is the following:
 
@@ -279,6 +292,7 @@
 hashModuleName :: ModuleName -> Text
 hashModuleName =
     Text.take 6
+    . extractBase64
     . Base64.encodeBase64
     . SHA1.hash
     . encodeUtf8
diff --git a/src/Stan/Report/Css.hs b/src/Stan/Report/Css.hs
--- a/src/Stan/Report/Css.hs
+++ b/src/Stan/Report/Css.hs
@@ -297,7 +297,8 @@
     w :: NonEmpty Rational
     w = 4.33 :| [12.66, 21, 29.33, 37.66, 46, 54.33, 62.66, 71, 79.33, 87.66, 96]
 
-    mediaQuery :: Double -> Css -> Css
+    -- clay-0.14: mediaQuery :: Double -> Css -> Css
+    -- clay-0.15: mediaQuery :: Number -> Css -> Css
     mediaQuery x = query M.screen [M.minWidth (em x)]
 
 marginAuto :: Css
diff --git a/stack-ghc-9.6.3.yaml b/stack-ghc-9.6.3.yaml
new file mode 100644
--- /dev/null
+++ b/stack-ghc-9.6.3.yaml
@@ -0,0 +1,12 @@
+resolver: lts-22.6 # GHC 9.6.3
+
+extra-deps:
+- ansi-wl-pprint-0.6.9@sha256:fb737bc96e2aef34ad595d54ced7a73f648c521ebcb00fe0679aff45ccd49212,2448
+- dir-traverse-0.2.3.0@sha256:adcc128f201ff95131b15ffe41365dc99c50dc3fa3a910f021521dc734013bfa,2137
+- extensions-0.1.0.1@sha256:f365d1da5ea1c60edd11334113ecd0d78eb12b4186b31151322ff7175a9adef7,5108
+- optparse-applicative-0.17.1.0@sha256:cb5f5f0dc9749846fc0e3df0041a8efee6368cc1cff07336acd4c3b02a951ed6,5147
+- tomland-1.3.3.2@sha256:887dc39a8c9819deb8fcb6fde72e87dad4c94108b1736a5bf7215ccf3117bd0f,9474
+- trial-0.0.0.0@sha256:ebd93f3485dd7f0ce8426fa46b500f26edbea285c2890150123e1b0f6a92c7db,4410
+- trial-optparse-applicative-0.0.0.0@sha256:ee878dbf412849d4fb52d7bca93bec45a6392a93e03a46bd320109b9a0ff2a38,2540
+- trial-tomland-0.0.0.0@sha256:c10c5c3f94e3dcfcad4a66cf70682ace77d5381596aff91fa2030636d07de977,2541
+- validation-selective-0.2.0.0@sha256:e1ab5482dede8bf676d729a09109c7c5f798363b9d458e4197a27afb8b48fdd3,3907
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-22.0 # GHC 9.6.3
+resolver: lts-22.7 # GHC 9.6.4
 
 extra-deps:
 - ansi-wl-pprint-0.6.9@sha256:fb737bc96e2aef34ad595d54ced7a73f648c521ebcb00fe0679aff45ccd49212,2448
diff --git a/stan.cabal b/stan.cabal
--- a/stan.cabal
+++ b/stan.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                stan
-version:             0.1.2.0
+version:             0.1.2.1
 synopsis:            Haskell STatic ANalyser
 description:
     Stan is a Haskell __ST__atic __AN__alysis CLI tool.
@@ -19,6 +19,7 @@
                      CHANGELOG.md
 extra-source-files:  test/.stan-example.toml
                      stack-ghc-9.4.8.yaml
+                     stack-ghc-9.6.3.yaml
                      stack.yaml
 tested-with:         GHC == 8.8.4
                      GHC == 8.10.7
@@ -134,10 +135,10 @@
                        Stan.Hie.Debug908
 
   build-depends:       array ^>= 0.5
-                     , base64 ^>= 0.4.1
+                     , base64 >= 0.4.1 && < 1.1
                      , blaze-html ^>= 0.9.1
                      , bytestring >= 0.10 && < 0.13
-                     , clay ^>= 0.14
+                     , clay >= 0.14 && < 0.16
                      , colourista >= 0.1 && < 0.3
                      , containers >= 0.5 && < 0.7
                      , cryptohash-sha1 ^>= 0.11