diff --git a/docs/tutorials/otio-serialized-schema-only-fields.md b/docs/tutorials/otio-serialized-schema-only-fields.md
index cce285ff3..b9496d9d9 100644
--- a/docs/tutorials/otio-serialized-schema-only-fields.md
+++ b/docs/tutorials/otio-serialized-schema-only-fields.md
@@ -140,7 +140,7 @@ parameters:
 - *name*
 - *source_range*
 
-### Effect.2
+### Effect.1
 
 parameters:
 - *effect_name*
diff --git a/docs/tutorials/otio-serialized-schema.md b/docs/tutorials/otio-serialized-schema.md
index 91124fb5b..6c966f139 100644
--- a/docs/tutorials/otio-serialized-schema.md
+++ b/docs/tutorials/otio-serialized-schema.md
@@ -298,7 +298,7 @@ parameters:
 - *name*: 
 - *source_range*: 
 
-### Effect.2
+### Effect.1
 
 *full module path*: `opentimelineio.schema.Effect`
 
diff --git a/src/opentimelineio/CORE_VERSION_MAP.cpp b/src/opentimelineio/CORE_VERSION_MAP.cpp
index 932c2e47c..60e160f7d 100644
--- a/src/opentimelineio/CORE_VERSION_MAP.cpp
+++ b/src/opentimelineio/CORE_VERSION_MAP.cpp
@@ -142,13 +142,13 @@ const label_to_schema_version_map CORE_VERSION_MAP{
           { "Transition", 1 },
           { "UnknownSchema", 1 },
       } },
-    { "0.18.0",
+    { "0.18.0.dev1",
       {
           { "Adapter", 1 },
           { "Clip", 2 },
           { "Composable", 1 },
           { "Composition", 1 },
-          { "Effect", 2 },
+          { "Effect", 1 },
           { "ExternalReference", 1 },
           { "FreezeFrame", 1 },
           { "Gap", 1 },
diff --git a/src/opentimelineio/effect.h b/src/opentimelineio/effect.h
index 1220d54b7..5d27ba24d 100644
--- a/src/opentimelineio/effect.h
+++ b/src/opentimelineio/effect.h
@@ -14,7 +14,7 @@ class Effect : public SerializableObjectWithMetadata
     struct Schema
     {
         static auto constexpr name   = "Effect";
-        static int constexpr version = 2;
+        static int constexpr version = 1;
     };
 
     using Parent = SerializableObjectWithMetadata;
diff --git a/tests/baselines/empty_effect.json b/tests/baselines/empty_effect.json
index c2b0f83a3..7046ab4e5 100644
--- a/tests/baselines/empty_effect.json
+++ b/tests/baselines/empty_effect.json
@@ -1,5 +1,5 @@
 {
-    "OTIO_SCHEMA" : "Effect.2",
+    "OTIO_SCHEMA" : "Effect.1",
     "name" : "",
     "effect_name" : "",
     "metadata" : {},