diff --git a/src/main/java/com/falsepattern/lib/api/ComplexVersion.java b/src/main/java/com/falsepattern/lib/api/ComplexVersion.java
index 1008f0a..91f0c99 100644
--- a/src/main/java/com/falsepattern/lib/api/ComplexVersion.java
+++ b/src/main/java/com/falsepattern/lib/api/ComplexVersion.java
@@ -11,5 +11,6 @@ import lombok.NonNull;
 public class ComplexVersion extends com.falsepattern.lib.version.ComplexVersion {
     public ComplexVersion(@NonNull Version mainVersion, Version... subVersions) {
         super(mainVersion, subVersions);
+        Deprecation.warn();
     }
 }
diff --git a/src/main/java/com/falsepattern/lib/api/DependencyLoader.java b/src/main/java/com/falsepattern/lib/api/DependencyLoader.java
index 02a5279..dfff652 100644
--- a/src/main/java/com/falsepattern/lib/api/DependencyLoader.java
+++ b/src/main/java/com/falsepattern/lib/api/DependencyLoader.java
@@ -14,9 +14,11 @@ public class DependencyLoader {
     @Builder
     public static void loadLibrary(String loadingModId, String groupId, String artifactId, @NonNull Version minVersion, Version maxVersion, @NonNull Version preferredVersion, String regularSuffix, String devSuffix) {
         FalsePatternLib.loadLibrary(loadingModId, groupId, artifactId, minVersion, maxVersion, preferredVersion, regularSuffix, devSuffix);
+        Deprecation.warn();
     }
 
     public static void addMavenRepo(String url) {
         FalsePatternLib.addMavenRepo(url);
+        Deprecation.warn();
     }
 }
diff --git a/src/main/java/com/falsepattern/lib/api/Deprecation.java b/src/main/java/com/falsepattern/lib/api/Deprecation.java
new file mode 100644
index 0000000..111f964
--- /dev/null
+++ b/src/main/java/com/falsepattern/lib/api/Deprecation.java
@@ -0,0 +1,10 @@
+package com.falsepattern.lib.api;
+
+final class Deprecation {
+    static void warn() {
+        new Exception("\nDEPRECATION WARNING\nDEPRECATION WARNING\n" +
+                      "Someone used the deprecated FalsePatternLib api.\n" +
+                      "This api will be replaced in FalsePatternLib 0.7! You should probably update your mods.\n" +
+                      "See the following stacktrace for hints on what mod could be the cause.").printStackTrace();
+    }
+}
diff --git a/src/main/java/com/falsepattern/lib/api/SemanticVersion.java b/src/main/java/com/falsepattern/lib/api/SemanticVersion.java
index 95410aa..2c30668 100644
--- a/src/main/java/com/falsepattern/lib/api/SemanticVersion.java
+++ b/src/main/java/com/falsepattern/lib/api/SemanticVersion.java
@@ -8,13 +8,16 @@ package com.falsepattern.lib.api;
 public class SemanticVersion extends com.falsepattern.lib.version.SemanticVersion {
     public SemanticVersion(int majorVersion, int minorVersion, int patchVersion, String preRelease, String build) {
         super(majorVersion, minorVersion, patchVersion, preRelease, build);
+        Deprecation.warn();
     }
 
     public SemanticVersion(int majorVersion, int minorVersion, int patchVersion, String preRelease) {
         super(majorVersion, minorVersion, patchVersion, preRelease);
+        Deprecation.warn();
     }
 
     public SemanticVersion(int majorVersion, int minorVersion, int patchVersion) {
         super(majorVersion, minorVersion, patchVersion);
+        Deprecation.warn();
     }
 }
diff --git a/src/main/java/com/falsepattern/lib/api/Version.java b/src/main/java/com/falsepattern/lib/api/Version.java
index 17d7c19..a279a09 100644
--- a/src/main/java/com/falsepattern/lib/api/Version.java
+++ b/src/main/java/com/falsepattern/lib/api/Version.java
@@ -8,5 +8,6 @@ package com.falsepattern.lib.api;
 public abstract class Version extends com.falsepattern.lib.version.Version {
     protected Version() {
         super();
+        Deprecation.warn();
     }
 }