diff --git a/language-docker.cabal b/language-docker.cabal
--- a/language-docker.cabal
+++ b/language-docker.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 288e8bea2c06314b9ba46925a5e5fa3c9c64e936b4c768874597c11d8bb53de4
+-- hash: a83a107737af6beacf2202a2f043950007834c140aad6ae9c656b1c983c129bb
 
 name:           language-docker
-version:        9.1.3
+version:        9.2.0
 synopsis:       Dockerfile parser, pretty-printer and embedded DSL
 description:    All functions for parsing and pretty-printing Dockerfiles are exported through @Language.Docker@. For more fine-grained operations look for specific modules that implement a certain functionality.
                 See the <https://github.com/hadolint/language-docker GitHub project> for the source-code and examples.
diff --git a/src/Language/Docker/Parser/Run.hs b/src/Language/Docker/Parser/Run.hs
--- a/src/Language/Docker/Parser/Run.hs
+++ b/src/Language/Docker/Parser/Run.hs
@@ -1,6 +1,5 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TupleSections #-}
 
 module Language.Docker.Parser.Run
   ( parseRun,
@@ -26,7 +25,7 @@
   | MountArgId Text
   | MountArgMode Text
   | MountArgReadOnly Bool
-  | MountArgRequired
+  | MountArgRequired Bool
   | MountArgSharing CacheSharing
   | MountArgSource SourcePath
   | MountArgTarget TargetPath
@@ -165,7 +164,7 @@
     secretOpts :: RunMountArg -> SecretOpts -> SecretOpts
     secretOpts (MountArgTarget path) co = co {sTarget = Just path}
     secretOpts (MountArgId i) co = co {sCacheId = Just i}
-    secretOpts MountArgRequired co = co {sIsRequired = Just True}
+    secretOpts (MountArgRequired r) co = co {sIsRequired = Just r}
     secretOpts (MountArgSource path) co = co {sSource = Just path}
     secretOpts (MountArgMode m) co = co {sMode = Just m}
     secretOpts (MountArgUid u) co = co {sUid = Just u}
@@ -256,7 +255,15 @@
 mountArgReadWrite = MountArgReadOnly <$> (choice ["rw", "readwrite"] $> False)
 
 mountArgRequired :: Parser RunMountArg
-mountArgRequired = MountArgRequired <$ string "required"
+mountArgRequired = MountArgRequired <$> choice
+    [ choice ["required=true",
+              "required=True"
+             ] $> True,
+      choice ["required=false",
+              "required=False"
+             ] $> False,
+      string "required" $> True  -- This must come last in the list!
+    ]
 
 mountArgSharing :: Parser RunMountArg
 mountArgSharing = MountArgSharing <$> key "sharing" cacheSharing
@@ -280,7 +287,7 @@
 toArgName (MountArgId _) = "id"
 toArgName (MountArgMode _) = "mode"
 toArgName (MountArgReadOnly _) = "ro"
-toArgName MountArgRequired = "required"
+toArgName (MountArgRequired _) = "required"
 toArgName (MountArgSharing _) = "sharing"
 toArgName (MountArgSource _) = "source"
 toArgName (MountArgTarget _) = "target"
diff --git a/test/Language/Docker/ParserSpec.hs b/test/Language/Docker/ParserSpec.hs
--- a/test/Language/Docker/ParserSpec.hs
+++ b/test/Language/Docker/ParserSpec.hs
@@ -544,6 +544,34 @@
             file
             [ Run $ RunArgs (ArgumentsText "echo foo") flags
             ]
+    it "--mount=type=ssh,required=false" $
+      let file = Text.unlines ["RUN --mount=type=ssh,required=false echo foo"]
+          flags = def {mount = Just $ SshMount def {sIsRequired = Just False}}
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
+    it "--mount=type=ssh,required=False" $
+      let file = Text.unlines ["RUN --mount=type=ssh,required=False echo foo"]
+          flags = def {mount = Just $ SshMount def {sIsRequired = Just False}}
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
+    it "--mount=type=secret,required=true" $
+      let file = Text.unlines ["RUN --mount=type=secret,required=true echo foo"]
+          flags = def {mount = Just $ SecretMount def {sIsRequired = Just True}}
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
+    it "--mount=type=secret,required=True" $
+      let file = Text.unlines ["RUN --mount=type=secret,required=True echo foo"]
+          flags = def {mount = Just $ SecretMount def {sIsRequired = Just True}}
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
     it "--mount=type=ssh all modifiers" $
       let file = Text.unlines ["RUN --mount=type=ssh,target=/foo,id=a,required,source=/bar,mode=0700,uid=0,gid=0 echo foo"]
           flags =
@@ -566,8 +594,52 @@
             file
             [ Run $ RunArgs (ArgumentsText "echo foo") flags
             ]
+    it "--mount=type=ssh all modifiers, required explicit" $
+      let file = Text.unlines ["RUN --mount=type=ssh,target=/foo,id=a,required=true,source=/bar,mode=0700,uid=0,gid=0 echo foo"]
+          flags =
+            def
+              { mount =
+                  Just $
+                    SshMount
+                      ( def
+                          { sTarget = Just "/foo",
+                            sCacheId = Just "a",
+                            sIsRequired = Just True,
+                            sSource = Just "/bar",
+                            sMode = Just "0700",
+                            sUid = Just 0,
+                            sGid = Just 0
+                          }
+                      )
+              }
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
     it "--mount=type=secret all modifiers" $
       let file = Text.unlines ["RUN --mount=type=secret,target=/foo,id=a,required,source=/bar,mode=0700,uid=0,gid=0 echo foo"]
+          flags =
+            def
+              { mount =
+                  Just $
+                    SecretMount
+                      ( def
+                          { sTarget = Just "/foo",
+                            sCacheId = Just "a",
+                            sIsRequired = Just True,
+                            sSource = Just "/bar",
+                            sMode = Just "0700",
+                            sUid = Just 0,
+                            sGid = Just 0
+                          }
+                      )
+              }
+       in assertAst
+            file
+            [ Run $ RunArgs (ArgumentsText "echo foo") flags
+            ]
+    it "--mount=type=secret all modifiers, required explicit" $
+      let file = Text.unlines ["RUN --mount=type=secret,target=/foo,id=a,required=true,source=/bar,mode=0700,uid=0,gid=0 echo foo"]
           flags =
             def
               { mount =