diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7413e020..972ead41 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -97,7 +97,7 @@ jobs:
             gradle-{{ checksum ".circleci/gradle_cache_seed" }}-{{ checksum
             ".circleci/config.yml" }}-windows
       - run:
-          command: ./gradlew --no-daemon build -x wasmNodeTest
+          command: ./gradlew --no-daemon build -x wasmJsNodeTest -x wasmWasiNodeTest
           shell: bash.exe
       - save_cache:
           paths:
diff --git a/assertk/build.gradle.kts b/assertk/build.gradle.kts
index c3ae5f6e..f95cf970 100644
--- a/assertk/build.gradle.kts
+++ b/assertk/build.gradle.kts
@@ -1,7 +1,5 @@
-import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
-import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
+import org.jetbrains.kotlin.gradle.plugin.KotlinCompilation.Companion.TEST_COMPILATION_NAME
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType.common
-import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType.wasm
 
 plugins {
     id("assertk.multiplatform")
@@ -23,15 +21,6 @@ kotlin {
         withJava()
     }
 
-    @OptIn(ExperimentalKotlinGradlePluginApi::class)
-    applyDefaultHierarchyTemplate {
-        group("coroutines") {
-            withNative()
-            withJs()
-            withJvm()
-        }
-    }
-
     sourceSets {
         commonMain {
             dependencies {
@@ -56,11 +45,19 @@ kotlin {
             }
         }
 
-        val coroutinesTest by getting {
+        val coroutinesTest by creating {
+            dependsOn(commonTest.get())
             dependencies {
                 implementation(libs.kotlinx.coroutines)
                 implementation(libs.kotlinx.coroutines.test)
             }
         }
+        targets.configureEach {
+            if (platformType != common && name != "wasmWasi") {
+                compilations.getByName(TEST_COMPILATION_NAME)
+                    .defaultSourceSet
+                    .dependsOn(coroutinesTest)
+            }
+        }
     }
 }
diff --git a/assertk/src/wasmJsMain/kotlin/assertk/ThreadLocalRef.kt b/assertk/src/wasmMain/kotlin/assertk/ThreadLocalRef.kt
similarity index 100%
rename from assertk/src/wasmJsMain/kotlin/assertk/ThreadLocalRef.kt
rename to assertk/src/wasmMain/kotlin/assertk/ThreadLocalRef.kt
diff --git a/assertk/src/wasmJsMain/kotlin/assertk/assertions/support/support.kt b/assertk/src/wasmMain/kotlin/assertk/assertions/support/support.kt
similarity index 100%
rename from assertk/src/wasmJsMain/kotlin/assertk/assertions/support/support.kt
rename to assertk/src/wasmMain/kotlin/assertk/assertions/support/support.kt
diff --git a/assertk/src/wasmJsMain/kotlin/assertk/failure.kt b/assertk/src/wasmMain/kotlin/assertk/failure.kt
similarity index 100%
rename from assertk/src/wasmJsMain/kotlin/assertk/failure.kt
rename to assertk/src/wasmMain/kotlin/assertk/failure.kt
diff --git a/assertk/src/wasmJsMain/kotlin/assertk/showError.kt b/assertk/src/wasmMain/kotlin/assertk/showError.kt
similarity index 100%
rename from assertk/src/wasmJsMain/kotlin/assertk/showError.kt
rename to assertk/src/wasmMain/kotlin/assertk/showError.kt
diff --git a/assertk/src/wasmJsTest/kotlin/test/assertk/assertions/support/WasmJsSupportTest.kt b/assertk/src/wasmTest/kotlin/test/assertk/assertions/support/WasmJsSupportTest.kt
similarity index 100%
rename from assertk/src/wasmJsTest/kotlin/test/assertk/assertions/support/WasmJsSupportTest.kt
rename to assertk/src/wasmTest/kotlin/test/assertk/assertions/support/WasmJsSupportTest.kt
diff --git a/assertk/src/wasmJsTest/kotlin/test/assertk/exceptionName.kt b/assertk/src/wasmTest/kotlin/test/assertk/exceptionName.kt
similarity index 100%
rename from assertk/src/wasmJsTest/kotlin/test/assertk/exceptionName.kt
rename to assertk/src/wasmTest/kotlin/test/assertk/exceptionName.kt
diff --git a/assertk/src/wasmJsTest/kotlin/test/assertk/runTest.kt b/assertk/src/wasmWasiTest/kotlin/test/assertk/runTest.kt
similarity index 100%
rename from assertk/src/wasmJsTest/kotlin/test/assertk/runTest.kt
rename to assertk/src/wasmWasiTest/kotlin/test/assertk/runTest.kt
diff --git a/buildSrc/src/main/kotlin/assertk.multiplatform.gradle.kts b/buildSrc/src/main/kotlin/assertk.multiplatform.gradle.kts
index 1160b0b5..384fc1b5 100644
--- a/buildSrc/src/main/kotlin/assertk.multiplatform.gradle.kts
+++ b/buildSrc/src/main/kotlin/assertk.multiplatform.gradle.kts
@@ -43,10 +43,11 @@ kotlin {
             }
         }
     }
-    // TODO Remove conditional once coroutines ships a version with WASM target.
-    if (project.path != ":assertk-coroutines") {
+    // TODO Remove conditional once coroutines ships a version with WASI target.
+    val hasWasmWasi = project.path != ":assertk-coroutines"
+    if (hasWasmWasi) {
         @OptIn(ExperimentalWasmDsl::class)
-        wasmJs {
+        wasmWasi {
             nodejs()
         }
     }
@@ -71,6 +72,26 @@ kotlin {
     androidNativeArm64()
     androidNativeX86()
     androidNativeX64()
+
+    @OptIn(ExperimentalWasmDsl::class)
+    wasmJs {
+        nodejs()
+    }
+
+    applyDefaultHierarchyTemplate()
+
+    // The above does not yet create a common Wasm source set, so build our own.
+    // https://youtrack.jetbrains.com/issue/KT-61988
+    sourceSets {
+        val wasmMain by creating
+        val wasmTest by creating
+        named("wasmJsMain") { dependsOn(wasmMain) }
+        named("wasmJsTest") { dependsOn(wasmTest) }
+        if (hasWasmWasi) {
+            named("wasmWasiMain") { dependsOn(wasmMain) }
+            named("wasmWasiTest") { dependsOn(wasmTest) }
+        }
+    }
 }
 
 tasks.withType<KotlinJvmCompile> {
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index d9b01eb9..54b49803 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,7 +1,7 @@
 [versions]
 assertk = "1.0.0-SNAPSHOT"
 kotlin = "1.9.21"
-kotlinx-coroutines = "1.7.3"
+kotlinx-coroutines = "1.8.0"
 [libraries]
 kotlin-gradle = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 dokka-gradle = { module = "org.jetbrains.dokka:dokka-gradle-plugin", version = "1.9.10" }