diff --git a/README.md b/README.md
index 34a29ed..1fbc954 100644
--- a/README.md
+++ b/README.md
@@ -659,6 +659,10 @@ Contributors: Timon Kanters, Jeroen Erik Jensen, Krzysztof Karczewski
 
 ## Release notes
 
+### 1.8.4
+
+* Dependency updates in `pom.xml`. No code changes.
+
 ### 1.8.3
 
 * Introduce caching of trace event method annotations in the `Tracer.invoke()` function.
diff --git a/extensions/pom.xml b/extensions/pom.xml
index 28aa5db..39754bf 100644
--- a/extensions/pom.xml
+++ b/extensions/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>com.tomtom.kotlin</groupId>
         <artifactId>kotlin-tools</artifactId>
-        <version>1.8.3</version>
+        <version>1.8.4</version>
     </parent>
 
     <artifactId>extensions</artifactId>
diff --git a/extensions/src/test/java/com/tomtom/kotlin/extensions/IfExtensionsTest.kt b/extensions/src/test/java/com/tomtom/kotlin/extensions/IfExtensionsTest.kt
index bcb69d7..fadaf26 100644
--- a/extensions/src/test/java/com/tomtom/kotlin/extensions/IfExtensionsTest.kt
+++ b/extensions/src/test/java/com/tomtom/kotlin/extensions/IfExtensionsTest.kt
@@ -29,10 +29,7 @@ internal class IfExtensionsTest {
     fun `ifTrue on true`() {
         // GIVEN
         val sut = true
-        // TODO: replace with `spyk({ 1 })` when https://github.com/mockk/mockk/issues/1033 is fixed.
-        val ifTrueBlock: () -> Int = spyk {
-            every { this@spyk.invoke() } answers { 1 }
-        }
+        val ifTrueBlock = spyk({ 1 })
 
         // WHEN
         val result = sut.ifTrue(ifTrueBlock)
@@ -46,10 +43,7 @@ internal class IfExtensionsTest {
     fun `ifTrue on false`() {
         // GIVEN
         val sut = false
-        // TODO: replace with `spyk({ 1 })` when https://github.com/mockk/mockk/issues/1033 is fixed.
-        val ifTrueBlock: () -> Int = spyk {
-            every { this@spyk.invoke() } answers { 1 }
-        }
+        val ifTrueBlock = spyk({ 1 })
 
         // WHEN
         val result = sut.ifTrue(ifTrueBlock)
@@ -63,10 +57,7 @@ internal class IfExtensionsTest {
     fun `ifTrue on null`() {
         // GIVEN
         val sut: Boolean? = null
-        // TODO: replace with `spyk({ 1 })` when https://github.com/mockk/mockk/issues/1033 is fixed.
-        val ifTrueBlock: () -> Int = spyk {
-            every { this@spyk.invoke() } answers { 1 }
-        }
+        val ifTrueBlock = spyk({ 1 })
 
         // WHEN
         val result = sut.ifTrue(ifTrueBlock)
@@ -100,10 +91,7 @@ internal class IfExtensionsTest {
     fun `ifNull on null`() {
         // GIVEN
         val sut: Int? = null
-        // TODO: replace with `spyk({ 1 })` when https://github.com/mockk/mockk/issues/1033 is fixed.
-        val ifNullBlock: () -> Int = spyk {
-            every { this@spyk.invoke() } answers { 1 }
-        }
+        val ifNullBlock = spyk({ 1 })
 
         // WHEN
         val result = sut.ifNull(ifNullBlock)
@@ -121,10 +109,7 @@ internal class IfExtensionsTest {
     fun `ifNull with different types`() {
         // GIVEN
         val sut = A
-        // TODO: replace with `spyk({ B })` when https://github.com/mockk/mockk/issues/1033 is fixed.
-        val ifNullBlock: () -> Base = spyk {
-            every { this@spyk.invoke() } answers { B }
-        }
+        val ifNullBlock = spyk({ B })
 
         // WHEN
         val result: Base = sut.ifNull(ifNullBlock)
diff --git a/memoization/pom.xml b/memoization/pom.xml
index 4248866..f009ac2 100644
--- a/memoization/pom.xml
+++ b/memoization/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>com.tomtom.kotlin</groupId>
         <artifactId>kotlin-tools</artifactId>
-        <version>1.8.3</version>
+        <version>1.8.4</version>
     </parent>
 
     <artifactId>memoization</artifactId>
diff --git a/pom.xml b/pom.xml
index 5474e7c..cb5e0b6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
 
     <groupId>com.tomtom.kotlin</groupId>
     <artifactId>kotlin-tools</artifactId>
-    <version>1.8.3</version>
+    <version>1.8.4</version>
     <packaging>pom</packaging>
 
     <name>Kotlin Tools</name>
@@ -95,25 +95,26 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <!-- Plugin versions. -->
-        <dokka-maven-plugin.version>1.8.10</dokka-maven-plugin.version>
+        <dokka-maven-plugin.version>1.9.10</dokka-maven-plugin.version>
         <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
         <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
-        <maven-project-info-reports-plugin.version>3.4.2</maven-project-info-reports-plugin.version>
+        <maven-project-info-reports-plugin.version>3.4.5</maven-project-info-reports-plugin.version>
         <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
-        <maven-surefire-plugin.version>3.1.2</maven-surefire-plugin.version>
+        <maven-surefire-plugin.version>3.2.1</maven-surefire-plugin.version>
         <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
 
         <!-- Library versions. -->
-        <equalsverifier.version>3.14</equalsverifier.version>
+        <equalsverifier.version>3.15.2</equalsverifier.version>
         <junit.version>4.13.2</junit.version>
-        <junit-jupiter.version>5.9.2</junit-jupiter.version>
-        <kotlin.version>1.8.10</kotlin.version>
-        <kotlin-test.version>1.8.10</kotlin-test.version>
-        <kotlin-test-junit.version>1.8.10</kotlin-test-junit.version>
+        <junit-jupiter.version>5.10.0</junit-jupiter.version>
+        <kotlin.version>1.9.10</kotlin.version>
+        <kotlin-test.version>1.9.10</kotlin-test.version>
+        <kotlin-test-junit.version>1.9.10</kotlin-test-junit.version>
         <kotlinx.html.version>0.7.3</kotlinx.html.version>
-        <kotlinx-coroutines-core.version>1.6.3-native-mt</kotlinx-coroutines-core.version>
-        <mockito-core.version>5.2.0</mockito-core.version>
-        <mockk.version>1.13.4</mockk.version>
+        <kotlinx-coroutines-core.version>1.7.3</kotlinx-coroutines-core.version>
+        <mockito-core.version>5.6.0</mockito-core.version>
+        <mockk.version>1.13.7</mockk.version>
+        <surefire-junit4-plugin.version>3.2.1</surefire-junit4-plugin.version>
     </properties>
 
     <distributionManagement>
@@ -188,7 +189,7 @@
                         <dependency>
                             <groupId>org.apache.maven.surefire</groupId>
                             <artifactId>surefire-junit4</artifactId>
-                            <version>3.1.2</version>
+                            <version>${surefire-junit4-plugin.version}</version>
                         </dependency>
                     </dependencies>
             </plugin>
diff --git a/traceevents/pom.xml b/traceevents/pom.xml
index 015f951..3b41120 100644
--- a/traceevents/pom.xml
+++ b/traceevents/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>com.tomtom.kotlin</groupId>
         <artifactId>kotlin-tools</artifactId>
-        <version>1.8.3</version>
+        <version>1.8.4</version>
     </parent>
 
     <artifactId>traceevents</artifactId>
diff --git a/uid/pom.xml b/uid/pom.xml
index f394920..84e8815 100644
--- a/uid/pom.xml
+++ b/uid/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>com.tomtom.kotlin</groupId>
         <artifactId>kotlin-tools</artifactId>
-        <version>1.8.3</version>
+        <version>1.8.4</version>
     </parent>
 
     <artifactId>uid</artifactId>