diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9936bd4..6f43961 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,6 +36,7 @@ jobs:
           - "9.6.6"
           - "9.8.2"
           - "9.10.1"
+          - "9.12.1"
 
         exclude:
           - os: macOS-latest
diff --git a/src/Stan/Ghc/Compat.hs b/src/Stan/Ghc/Compat.hs
index d3e24ba..fbdff02 100644
--- a/src/Stan/Ghc/Compat.hs
+++ b/src/Stan/Ghc/Compat.hs
@@ -16,4 +16,6 @@ import Stan.Ghc.Compat906 as Compat
 import Stan.Ghc.Compat906 as Compat
 #elif __GLASGOW_HASKELL__ == 910
 import Stan.Ghc.Compat906 as Compat
+#elif __GLASGOW_HASKELL__ == 912
+import Stan.Ghc.Compat906 as Compat
 #endif
diff --git a/src/Stan/Ghc/Compat906.hs b/src/Stan/Ghc/Compat906.hs
index 28b185c..548fa6b 100644
--- a/src/Stan/Ghc/Compat906.hs
+++ b/src/Stan/Ghc/Compat906.hs
@@ -4,7 +4,7 @@
 {-# OPTIONS_GHC -Wno-orphans #-}
 
 module Stan.Ghc.Compat906
-#if __GLASGOW_HASKELL__ == 906 || __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__ == 910
+#if __GLASGOW_HASKELL__ == 906 || __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__ == 910 || __GLASGOW_HASKELL__ == 912
     ( -- * Modules
       Module
     , ModuleName
diff --git a/src/Stan/Hie/Compat.hs b/src/Stan/Hie/Compat.hs
index d3bf0a8..f8c1325 100644
--- a/src/Stan/Hie/Compat.hs
+++ b/src/Stan/Hie/Compat.hs
@@ -16,4 +16,6 @@ import Stan.Hie.Compat904 as Compat
 import Stan.Hie.Compat904 as Compat
 #elif __GLASGOW_HASKELL__ == 910
 import Stan.Hie.Compat904 as Compat
+#elif __GLASGOW_HASKELL__ == 912
+import Stan.Hie.Compat904 as Compat
 #endif
diff --git a/src/Stan/Hie/Compat904.hs b/src/Stan/Hie/Compat904.hs
index 625e182..08e1d1e 100644
--- a/src/Stan/Hie/Compat904.hs
+++ b/src/Stan/Hie/Compat904.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE CPP #-}
 
 module Stan.Hie.Compat904
-#if __GLASGOW_HASKELL__ == 904 || __GLASGOW_HASKELL__ == 906 || __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__== 910
+#if __GLASGOW_HASKELL__ == 904 || __GLASGOW_HASKELL__ == 906 || __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__== 910 || __GLASGOW_HASKELL__== 912
     ( -- * Main HIE types
       ContextInfo (..)
     , HieArgs (..)
@@ -108,4 +108,3 @@ eqDeclType (DeclType d1) d2 = d1 == d2
 #else
   () where
 #endif
-
diff --git a/src/Stan/Hie/Debug.hs b/src/Stan/Hie/Debug.hs
index dce1b9c..3981068 100644
--- a/src/Stan/Hie/Debug.hs
+++ b/src/Stan/Hie/Debug.hs
@@ -16,4 +16,6 @@ import Stan.Hie.Debug902 as Compat
 import Stan.Hie.Debug908 as Compat
 #elif __GLASGOW_HASKELL__ == 910
 import Stan.Hie.Debug908 as Compat
+#elif __GLASGOW_HASKELL__ == 912
+import Stan.Hie.Debug908 as Compat
 #endif
diff --git a/src/Stan/Hie/Debug908.hs b/src/Stan/Hie/Debug908.hs
index b8f97b6..25350b0 100644
--- a/src/Stan/Hie/Debug908.hs
+++ b/src/Stan/Hie/Debug908.hs
@@ -21,7 +21,7 @@ package to dependencies and use the @pPrint@ function from the
 -}
 
 module Stan.Hie.Debug908
-#if __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__ == 910
+#if __GLASGOW_HASKELL__ == 908 || __GLASGOW_HASKELL__ == 910 || __GLASGOW_HASKELL__ == 912
     ( debugHieFile
     ) where
 
diff --git a/stan.cabal b/stan.cabal
index b4c77a9..fe920f0 100644
--- a/stan.cabal
+++ b/stan.cabal
@@ -32,7 +32,7 @@ source-repository head
   location:            https://github.com/kowainik/stan.git
 
 common common-options
-  build-depends:       base >= 4.13 && < 4.21 && (< 4.16.3.0 || >= 4.17)
+  build-depends:       base >= 4.13 && < 4.22 && (< 4.16.3.0 || >= 4.17)
                        -- ^^ .hie files don't contain enough type
                        -- information on ghc-9.2.[4-8] (base >=
                        -- 4.16.3.0 && < 4.17)
@@ -151,8 +151,8 @@ library
                      , directory ^>= 1.3
                      , extensions ^>= 0.0.0.1 || ^>= 0.1.0.0
                      , filepath >= 1.4 && < 1.6
-                     , ghc >= 8.8 && < 9.11
-                     , ghc-boot-th >= 8.8 && < 9.11
+                     , ghc >= 8.8 && < 9.13
+                     , ghc-boot-th >= 8.8 && < 9.13
                      , gitrev ^>= 1.3.1
                      , microaeson ^>= 0.1.0.0
                      , optparse-applicative >= 0.15 && < 0.19