diff --git a/src/cryogen_core/compiler.clj b/src/cryogen_core/compiler.clj
index 426b011..5349d32 100644
--- a/src/cryogen_core/compiler.clj
+++ b/src/cryogen_core/compiler.clj
@@ -44,7 +44,7 @@
 
 (defn parse-post-date
   "Parses the post date from the post's file name and returns the corresponding java date object"
-  [file-name date-fmt]
+  [^String file-name date-fmt]
   (let [fmt (java.text.SimpleDateFormat. date-fmt)]
     (.parse fmt (.substring file-name 0 10))))
 
@@ -69,7 +69,7 @@
 (defn page-content
   "Returns a map with the given page's file-name, metadata and content parsed from
   the file with the given markup."
-  [page config markup]
+  [^java.io.File page config markup]
   (with-open [rdr (java.io.PushbackReader. (reader page))]
     (let [page-name (.getName page)
           file-name (s/replace page-name (re-pattern-from-ext (m/ext markup)) ".html")
@@ -359,7 +359,7 @@
   "Generates all the html and copies over resources specified in the config"
   []
   (println (green "compiling assets..."))
-  (let [{:keys [site-url blog-prefix rss-name recent-posts sass-src sass-dest keep-files ignored-files previews?] :as config} (read-config)
+  (let [{:keys [^String site-url blog-prefix rss-name recent-posts sass-src sass-dest keep-files ignored-files previews?] :as config} (read-config)
         posts (add-prev-next (read-posts config))
         pages (add-prev-next (read-pages config))
         [navbar-pages sidebar-pages] (group-pages pages)
diff --git a/src/cryogen_core/github.clj b/src/cryogen_core/github.clj
index 6b292a9..44c51ca 100644
--- a/src/cryogen_core/github.clj
+++ b/src/cryogen_core/github.clj
@@ -25,7 +25,7 @@
                        (catch Exception e {:error (.getMessage e)}))]
     (when-not (:error git-resp)
       (if-let [git-src (json/parse-string git-resp)]
-        {:content (String. (Base64/decodeBase64 (get git-src "content")) "UTF-8")
+        {:content (String. ^bytes (Base64/decodeBase64 ^String (get git-src "content")) "UTF-8")
          :name (get git-src "name")
          :uri (get (get git-src "_links") "html")}))))
 
diff --git a/src/cryogen_core/io.clj b/src/cryogen_core/io.clj
index f813d16..6eea7bc 100644
--- a/src/cryogen_core/io.clj
+++ b/src/cryogen_core/io.clj
@@ -17,7 +17,7 @@
   (-> resource io/resource io/file))
 
 (defn ignore [ignored-files]
-  (fn [file]
+  (fn [^java.io.File file]
     (let [name    (.getName file)
           matches (map #(re-find % name) ignored-files)]
       (not (some seq matches)))))
@@ -27,12 +27,12 @@
   extension (ext) ignoring any files that match the given (ignored-files).
   First make sure that the root directory exists, if yes: process as normal;
   if no, return empty vector."
-  [f ext ignored-files]
+  [f ^String ext ignored-files]
   (if-let [root (get-resource f)]
     (->> (get-resource f)
          file-seq
          (filter (ignore ignored-files))
-         (filter (fn [file] (-> file .getName (.endsWith ext)))))
+         (filter (fn [^java.io.File file] (-> file .getName (.endsWith ext)))))
     []))
 
 (defn create-folder [folder]
@@ -47,9 +47,9 @@
 
 (defn copy-dir [src target ignored-files]
   (fs/mkdirs target)
-  (let [filename-filter (apply reject-re-filter ignored-files)
+  (let [^java.io.FileFilter filename-filter (apply reject-re-filter ignored-files)
         files (.listFiles (io/file src) filename-filter)]
-    (doseq [f files]
+    (doseq [^java.io.File f files]
       (let [out (io/file target (.getName f))]
         (if (.isDirectory f)
           (copy-dir f out ignored-files)
diff --git a/src/cryogen_core/plugins.clj b/src/cryogen_core/plugins.clj
index 86b2990..3d2f197 100644
--- a/src/cryogen_core/plugins.clj
+++ b/src/cryogen_core/plugins.clj
@@ -4,7 +4,7 @@
             [clojure.string :as s]
             [text-decoration.core :refer :all]))
 
-(defn load-plugin [url]
+(defn load-plugin [^java.net.URL url]
   (let [{:keys [description init]} (edn/read-string (slurp url))]
     (println (green (str "loading module: " description)))
     (-> init str (s/split #"/") first symbol require)
@@ -13,6 +13,6 @@
 (defn load-plugins []
   (let [plugins (.getResources (ClassLoader/getSystemClassLoader) "plugin.edn")]
     (loop []
-      (load-plugin (.. plugins nextElement openStream))
+      (load-plugin (. ^java.net.URL (. plugins nextElement) openStream))
       (when (.hasMoreElements plugins)
         (recur)))))
diff --git a/src/cryogen_core/rss.clj b/src/cryogen_core/rss.clj
index 38c8ec8..5411355 100644
--- a/src/cryogen_core/rss.clj
+++ b/src/cryogen_core/rss.clj
@@ -4,7 +4,7 @@
   (:import java.util.Date))
 
 
-(defn posts-to-items [site-url posts]
+(defn posts-to-items [^String site-url posts]
   (map
     (fn [{:keys [uri title content date enclosure]}]
       (let [link (str (if (.endsWith site-url "/") (apply str (butlast site-url)) site-url) uri)
diff --git a/src/cryogen_core/sass.clj b/src/cryogen_core/sass.clj
index 4da4472..6f767e0 100644
--- a/src/cryogen_core/sass.clj
+++ b/src/cryogen_core/sass.clj
@@ -23,11 +23,11 @@
   "Given a Diretory, gets files, Filtered to those having scss or sass
   extention. Ignores files matching any ignored regexps."
   [base-dir dir ignored-files]
-  (let [filename-filter (match-re-filter #"(?i:s[ca]ss$)")]
+  (let [^java.io.FileFilter filename-filter (match-re-filter #"(?i:s[ca]ss$)")]
     (->> (.listFiles (io/file base-dir dir) filename-filter)
-         (filter #(not (.isDirectory %)))
+         (filter #(not (.isDirectory ^java.io.File %)))
          (filter (ignore ignored-files))
-         (map #(.getName %)))))
+         (map #(.getName ^java.io.File %)))))
 
 (defn compile-sass-file!
   "Given a sass file which might be in src-sass directory,
diff --git a/src/cryogen_core/sitemap.clj b/src/cryogen_core/sitemap.clj
index 8641094..618828a 100644
--- a/src/cryogen_core/sitemap.clj
+++ b/src/cryogen_core/sitemap.clj
@@ -10,7 +10,7 @@
   (let [fmt (java.text.SimpleDateFormat. "yyyy-MM-dd")]
     (.format fmt date)))
 
-(defn loc [f]
+(defn loc [^java.io.File f]
   (-> f (.getAbsolutePath) (.split "resources/public/") second))
 
 (defn generate [site-url ignored-files]
@@ -19,7 +19,7 @@
       {:tag :urlset
        :attrs {:xmlns "http://www.sitemaps.org/schemas/sitemap/0.9"}
        :content
-       (for [f (find-assets "public" ".html" ignored-files)]
+       (for [^java.io.File f (find-assets "public" ".html" ignored-files)]
          {:tag :url
           :content
           [{:tag :loc
diff --git a/src/cryogen_core/toc.clj b/src/cryogen_core/toc.clj
index b8255a3..f576ccc 100644
--- a/src/cryogen_core/toc.clj
+++ b/src/cryogen_core/toc.clj
@@ -3,7 +3,7 @@
             [hiccup.core :as hiccup]))
 
 (def _h [:h1 :h2 :h3 :h4 :h5 :h6])
-(defn- compare_index [i1 i2] (- (.indexOf _h i2) (.indexOf _h i1)))
+(defn- compare_index [i1 i2] (- (.indexOf ^clojure.lang.APersistentVector _h i2) (.indexOf ^clojure.lang.APersistentVector _h i1)))
 
 (defn- get-headings
   "Turn a body of html content into a vector of elements whose tags are
@@ -41,7 +41,7 @@
                                                       (hiccup/html entry)) tag)))))
       (str acc "</ol>"))))
 
-(defn generate-toc [html]
+(defn generate-toc [^String html]
   (-> html
       (.getBytes "UTF-8")
       (java.io.ByteArrayInputStream.)
diff --git a/src/cryogen_core/watcher.clj b/src/cryogen_core/watcher.clj
index 0694fcf..88f4464 100644
--- a/src/cryogen_core/watcher.clj
+++ b/src/cryogen_core/watcher.clj
@@ -8,7 +8,7 @@
   (->> path
        file
        file-seq
-       (filter #(not (.isDirectory %)))
+       (filter #(not (.isDirectory ^java.io.File %)))
        (filter (ignore ignored-files))))
 
 (defn checksums [path ignored-files]