diff --git a/modules/core/shared/src/main/scala/data/Completion.scala b/modules/core/shared/src/main/scala/data/Completion.scala
index 01b7c3d7..0dec4639 100644
--- a/modules/core/shared/src/main/scala/data/Completion.scala
+++ b/modules/core/shared/src/main/scala/data/Completion.scala
@@ -39,6 +39,7 @@ object Completion {
   case object Show                      extends Completion
   case object Do                        extends Completion
   case object CreateView                extends Completion
+  case object AlterView                 extends Completion
   case object DropView                  extends Completion
   case object CreateProcedure           extends Completion
   case object DropProcedure             extends Completion
@@ -55,6 +56,7 @@ object Completion {
   case object DropRole                  extends Completion
   case object AlterRole                 extends Completion
   case object CreateMaterializedView    extends Completion
+  case object AlterMaterializedView     extends Completion
   case object RefreshMaterializedView   extends Completion
   case object DropMaterializedView      extends Completion
   case object CreateExtension           extends Completion
diff --git a/modules/core/shared/src/main/scala/net/message/CommandComplete.scala b/modules/core/shared/src/main/scala/net/message/CommandComplete.scala
index 60c7114d..1330ed99 100644
--- a/modules/core/shared/src/main/scala/net/message/CommandComplete.scala
+++ b/modules/core/shared/src/main/scala/net/message/CommandComplete.scala
@@ -76,6 +76,7 @@ object CommandComplete {
     case "DROP PROCEDURE"             => apply(Completion.DropProcedure)
     case "CALL"                       => apply(Completion.Call)
     case "CREATE VIEW"                => apply(Completion.CreateView)
+    case "ALTER VIEW"                 => apply(Completion.AlterView)
     case "DROP VIEW"                  => apply(Completion.DropView)
     case "CREATE DOMAIN"              => apply(Completion.CreateDomain)
     case "DROP DOMAIN"                => apply(Completion.DropDomain)
@@ -89,6 +90,7 @@ object CommandComplete {
     case "DROP ROLE"                  => apply(Completion.DropRole)
     case "ALTER ROLE"                 => apply(Completion.AlterRole)
     case "CREATE MATERIALIZED VIEW"   => apply(Completion.CreateMaterializedView)
+    case "ALTER MATERIALIZED VIEW"    => apply(Completion.AlterMaterializedView)
     case "REFRESH MATERIALIZED VIEW"  => apply(Completion.RefreshMaterializedView)
     case "DROP MATERIALIZED VIEW"     => apply(Completion.DropMaterializedView)
     case "CREATE EXTENSION"           => apply(Completion.CreateExtension)
diff --git a/modules/tests/shared/src/test/scala/CommandTest.scala b/modules/tests/shared/src/test/scala/CommandTest.scala
index 006a1567..7cd16441 100644
--- a/modules/tests/shared/src/test/scala/CommandTest.scala
+++ b/modules/tests/shared/src/test/scala/CommandTest.scala
@@ -167,6 +167,9 @@ class CommandTest extends SkunkTest {
       SELECT * FROM city
       """.command
 
+  val alterView: Command[Void] =
+    sql"ALTER VIEW city_view SET (security_barrier = true)".command
+
   val dropView: Command[Void] =
     sql"""
       DROP VIEW city_view
@@ -278,6 +281,9 @@ class CommandTest extends SkunkTest {
         SELECT now()
        """.command
 
+  val alterMaterializedView: Command[Void] =
+    sql"ALTER MATERIALIZED VIEW my_foo_mv SET (fillfactor = 90)".command
+
   val createUniqueIndexForMaterializedView: Command[Void] =
     sql"""
         CREATE UNIQUE INDEX IF NOT exists my_foo_mv_unique ON my_foo_mv(now)
@@ -469,22 +475,26 @@ class CommandTest extends SkunkTest {
     } yield "ok"
   }
 
-  sessionTest("create view, drop view"){ s=>
+  sessionTest("create view, alter view, drop view"){ s=>
     for{
       c <- s.execute(createView)
       _ <- assertEqual("completion", c, Completion.CreateView)
+      c <- s.execute(alterView)
+      _ <- assertEqual("completion", c, Completion.AlterView)
       c <- s.execute(dropView)
       _ <- assertEqual("completion", c, Completion.DropView)
       _ <- s.assertHealthy
     } yield "ok"
   }
 
-  sessionTest("refresh materialized view, refresh materialized view concurrently") { s =>
+  sessionTest("alter materialized view, refresh materialized view, refresh materialized view concurrently") { s =>
     for {
       c <- s.execute(createMaterializedView)
       _ <- assertEqual("completion", c, Completion.Select(1))
       c <- s.execute(createMaterializedView)
       _ <- assertEqual("completion", c, Completion.CreateMaterializedView)
+      c <- s.execute(alterMaterializedView)
+      _ <- assertEqual("completion", c, Completion.AlterMaterializedView)
       c <- s.execute(refreshMaterializedView)
       _ <- assertEqual("completion", c, Completion.RefreshMaterializedView)
       c <- s.execute(createUniqueIndexForMaterializedView)