diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1bd4bf98..d5deb2d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,7 +62,7 @@ jobs:
     needs: build
     strategy:
       matrix:
-        poko_sample_kotlin_version: [ ~, 2.0.21-RC ]
+        poko_sample_kotlin_version: [ 2.0.20, ~ ]
     steps:
       - name: Check out the repo
         uses: actions/checkout@v4
diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
index d4b7accb..c224ad56 100644
--- a/.idea/kotlinc.xml
+++ b/.idea/kotlinc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="2.0.20" />
+    <option name="version" value="2.0.21" />
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index b3ea85b1..f4d06c4f 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ exclusively compatible with specific versions of Poko.
 
 | Kotlin version  | Poko version |
 |-----------------|--------------|
-| 2.0.20          | 0.17.1       |
+| 2.0.20 – 2.0.21 | 0.17.1       |
 | 2.0.0 – 2.0.10  | 0.16.0       |
 | 1.9.0 – 1.9.24  | 0.15.3       |
 | 1.8.20 – 1.8.22 | 0.13.1       |
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 1288f829..6a5c593b 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -2,7 +2,7 @@
 
 androidx-compose-runtime = "1.7.3"
 
-kotlin = "2.0.20"
+kotlin = "2.0.21"
 kotlinCompileTesting = "1.6.0"
 kotlinCompileTestingFork = "0.5.1"
 # https://github.com/google/ksp/releases: