diff --git a/libropkg/include/ropkg/version.h b/libropkg/include/ropkg/version.h
new file mode 100644
index 0000000..7cbd4c4
--- /dev/null
+++ b/libropkg/include/ropkg/version.h
@@ -0,0 +1,57 @@
+#ifndef ROPKG_VERSION_H_
+#define ROPKG_VERSION_H_
+
+#include <blue/core/error.h>
+#include <ropkg/misc.h>
+#include <ropkg/status.h>
+
+#define ROPKG_VERSION_UPSTREAM_DIGIT_MAX 5
+
+struct ropkg_version;
+
+enum ropkg_comparison_op {
+	ROPKG_OP_EQUAL = 0,
+	ROPKG_OP_NOT_EQUAL = -1,
+	ROPKG_OP_LESS_THAN = -2,
+	ROPKG_OP_LESS_EQUAL = -3,
+	ROPKG_OP_GREATER_THAN = 1,
+	ROPKG_OP_GREATER_EQUAL = 2,
+};
+
+enum ropkg_version_release_phase {
+	ROPKG_VERSION_RELEASE_PHASE_ALPHA = 0,
+	ROPKG_VERSION_RELEASE_PHASE_BETA,
+	ROPKG_VERSION_RELEASE_PHASE_RC,
+	ROPKG_VERSION_RELEASE_PHASE_RELEASE,
+};
+
+ROPKG_API enum ropkg_status ropkg_version_create(struct ropkg_version **out);
+ROPKG_API void ropkg_version_destroy(struct ropkg_version *version);
+
+ROPKG_API void ropkg_version_set_release_phase(
+	struct ropkg_version *version,
+	enum ropkg_version_release_phase phase);
+ROPKG_API void ropkg_version_set_upstream_version(
+	struct ropkg_version *version,
+	const unsigned int upstream_version[ROPKG_VERSION_UPSTREAM_DIGIT_MAX]);
+ROPKG_API void ropkg_version_set_version_release_phase(
+	struct ropkg_version *version,
+	enum ropkg_version_release_phase phase,
+	unsigned int revision);
+ROPKG_API void ropkg_version_set_package_revision(
+	struct ropkg_version *version,
+	unsigned int revision);
+
+ROPKG_API b_result
+ropkg_version_parse(struct ropkg_version *version, const char *s);
+ROPKG_API size_t ropkg_version_to_string(
+	const struct ropkg_version *version,
+	char *out,
+	size_t max);
+
+ROPKG_API bool ropkg_version_compare(
+	const struct ropkg_version *left,
+	const struct ropkg_version *right,
+	enum ropkg_comparison_op op);
+
+#endif
diff --git a/libropkg/version.c b/libropkg/version.c
new file mode 100644
index 0000000..8ef85cb
--- /dev/null
+++ b/libropkg/version.c
@@ -0,0 +1,483 @@
+#include "version.h"
+
+#include <blue/core/stringstream.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+enum ropkg_status ropkg_version_create(struct ropkg_version **out)
+{
+	struct ropkg_version *version = malloc(sizeof *version);
+	if (!version) {
+		return ROPKG_ERR_NO_MEMORY;
+	}
+
+	memset(version, 0x0, sizeof *version);
+
+	version->v_release_phase = ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+	version->v_upstream_version[0] = 1;
+	version->v_version_release_phase = ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+	version->v_version_release_phase_revision = 1;
+	version->v_package_revision = 1;
+
+	*out = version;
+	return ROPKG_SUCCESS;
+}
+
+void ropkg_version_destroy(struct ropkg_version *version)
+{
+	free(version);
+}
+
+static b_result parse_release_phase(
+	const char *s,
+	enum ropkg_version_release_phase *out)
+{
+	if (s[0] == 0) {
+		*out = ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+	} else if (!strcmp(s, "alpha")) {
+		*out = ROPKG_VERSION_RELEASE_PHASE_ALPHA;
+	} else if (!strcmp(s, "beta")) {
+		*out = ROPKG_VERSION_RELEASE_PHASE_BETA;
+	} else {
+		b_result result = b_error_with_msg_template(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_RELEASE_PHASE,
+			B_ERROR_PARAM("phase", s));
+		b_error_add_submsg(
+			result,
+			B_ERROR_SUBMSG_INFO,
+			ROPKG_EMSG_AVAILABLE_RELEASE_PHASES);
+		return result;
+	}
+
+	return B_RESULT_SUCCESS;
+}
+
+static b_result parse_version_release_phase(
+	const char *s,
+	enum ropkg_version_release_phase *out_phase,
+	unsigned int *out_revision,
+	size_t *nr_read)
+{
+	size_t i = 0;
+
+	if (*s == '\0') {
+		*out_phase = ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+		*out_revision = 1;
+		*nr_read = i;
+		return B_RESULT_SUCCESS;
+	}
+
+	if (*s == '~') {
+		i++;
+		s++;
+	} else {
+		return b_error_with_msg(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_VERSION_RELEASE_PHASE_UNKNOWN_START);
+	}
+
+	char temp[64];
+	size_t z = 0;
+
+	while (*s && isalpha(*s) && z < sizeof temp - 1) {
+		temp[z++] = tolower(*s);
+		temp[z] = 0;
+		i++;
+		s++;
+	}
+
+	if (!strcmp(temp, "alpha")) {
+		*out_phase = ROPKG_VERSION_RELEASE_PHASE_ALPHA;
+	} else if (!strcmp(temp, "beta")) {
+		*out_phase = ROPKG_VERSION_RELEASE_PHASE_BETA;
+	} else if (!strcmp(temp, "rc")) {
+		*out_phase = ROPKG_VERSION_RELEASE_PHASE_RC;
+	} else {
+		b_result result = b_error_with_msg_template(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_VERSION_RELEASE_PHASE,
+			B_ERROR_PARAM("phase", temp));
+		b_error_add_submsg(
+			result,
+			B_ERROR_SUBMSG_INFO,
+			ROPKG_EMSG_AVAILABLE_VERSION_RELEASE_PHASES);
+		return result;
+	}
+
+	z = 0;
+	while (*s && isdigit(*s)) {
+		temp[z++] = *s;
+		temp[z] = 0;
+		i++;
+		s++;
+	}
+
+	if (z > 0) {
+		char *ep;
+		*out_revision = strtoul(temp, &ep, 10);
+	}
+
+	*nr_read = i;
+	return B_RESULT_SUCCESS;
+}
+
+static b_result parse_package_revision(
+	const char *s,
+	unsigned int *out_revision,
+	size_t *nr_read)
+{
+	size_t i = 0;
+
+	if (*s == '\0') {
+		*out_revision = 1;
+		*nr_read = i;
+		return B_RESULT_SUCCESS;
+	}
+
+	if (*s == '-') {
+		i++;
+		s++;
+	} else {
+		return b_error_with_msg(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_PACKAGE_REVISION_UNKNOWN_START);
+	}
+
+	char temp[64];
+	size_t z = 0;
+
+	while (*s && isdigit(*s) && z < sizeof temp - 1) {
+		temp[z++] = *s;
+		temp[z] = 0;
+		i++;
+		s++;
+	}
+
+	char *ep;
+	*out_revision = strtoul(temp, &ep, 10);
+
+	*nr_read = i;
+	return B_RESULT_SUCCESS;
+}
+
+static b_result parse_upstream_version(
+	const char *s,
+	unsigned int out[ROPKG_VERSION_UPSTREAM_DIGIT_MAX],
+	size_t *nr_read)
+{
+	if (!isdigit(*s)) {
+		return b_error_with_msg(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_UPSTREAM_VERSION_UNKNOWN_START);
+	}
+
+	char temp[64];
+	size_t i = 0;
+	unsigned int nr_temp = 0;
+	unsigned int nr_digits = 0;
+	char last = 0;
+	char *ep;
+
+	while (1) {
+		last = s[i];
+
+		if (isdigit(s[i])) {
+			temp[nr_temp++] = s[i];
+			temp[nr_temp] = 0;
+			i++;
+			continue;
+		}
+
+		if (s[i] == '.') {
+			if (nr_temp == 0) {
+				return b_error_with_msg(
+					ROPKG_ERROR_VENDOR,
+					ROPKG_ERR_INVALID_VERSION_FORMAT,
+					ROPKG_EMSG_INVALID_UPSTREAM_VERSION_TWO_DOTS);
+			}
+
+			if (nr_digits >= ROPKG_VERSION_UPSTREAM_DIGIT_MAX - 1) {
+				return b_error_with_msg(
+					ROPKG_ERROR_VENDOR,
+					ROPKG_ERR_INVALID_VERSION_FORMAT,
+					ROPKG_EMSG_INVALID_UPSTREAM_VERSION_TOO_MANY_NUMBERS);
+			}
+
+			out[nr_digits] = strtoul(temp, &ep, 10);
+			nr_digits++;
+			nr_temp = 0;
+			i++;
+			continue;
+		}
+
+		if (nr_temp == 0) {
+			return b_error_with_msg(
+				ROPKG_ERROR_VENDOR,
+				ROPKG_ERR_INVALID_VERSION_FORMAT,
+				ROPKG_EMSG_INVALID_UPSTREAM_VERSION_END_DOT);
+		}
+
+		out[nr_digits] = strtoul(temp, &ep, 10);
+		nr_digits++;
+		nr_temp = 0;
+		break;
+	}
+
+	*nr_read = i;
+	return B_RESULT_SUCCESS;
+}
+
+b_result ropkg_version_parse(struct ropkg_version *version, const char *s)
+{
+	enum ropkg_version_release_phase release_phase
+		= ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+	unsigned int upstream_version[ROPKG_VERSION_UPSTREAM_DIGIT_MAX]
+		= {0, 0, 0, 0, 0};
+	enum ropkg_version_release_phase version_release_phase
+		= ROPKG_VERSION_RELEASE_PHASE_RELEASE;
+	unsigned int version_release_phase_revision = 1;
+	unsigned int package_revision = 1;
+
+	b_result result = B_RESULT_SUCCESS;
+
+	char temp[64] = {0};
+	size_t z = 0;
+
+	while (*s && !isdigit(*s) && z < sizeof temp - 1) {
+		temp[z] = tolower(*s);
+		z++;
+		s++;
+	}
+
+	result = parse_release_phase(temp, &release_phase);
+	if (b_result_is_error(result)) {
+		return b_result_propagate(result);
+	}
+
+	size_t nr_read = 0;
+	result = parse_upstream_version(s, upstream_version, &nr_read);
+	if (b_result_is_error(result)) {
+		return b_result_propagate(result);
+	}
+
+	s += nr_read;
+	if (*s == '~' || *s == 0) {
+		result = parse_version_release_phase(
+			s,
+			&version_release_phase,
+			&version_release_phase_revision,
+			&nr_read);
+
+		s += nr_read;
+		if (b_result_is_error(result)) {
+			return b_result_propagate(result);
+		}
+	}
+
+	if (*s == '-' || *s == 0) {
+		result = parse_package_revision(s, &package_revision, &nr_read);
+
+		s += nr_read;
+		if (b_result_is_error(result)) {
+			return b_result_propagate(result);
+		}
+	}
+
+	if (*s != 0) {
+		return b_error_with_msg(
+			ROPKG_ERROR_VENDOR,
+			ROPKG_ERR_INVALID_VERSION_FORMAT,
+			ROPKG_EMSG_INVALID_VERSION_UNKNOWN_END);
+	}
+
+	version->v_release_phase = release_phase;
+	memcpy(version->v_upstream_version,
+	       upstream_version,
+	       sizeof upstream_version);
+	version->v_version_release_phase = version_release_phase;
+	version->v_version_release_phase_revision
+		= version_release_phase_revision;
+	version->v_package_revision = package_revision;
+
+	return B_RESULT_SUCCESS;
+}
+
+void ropkg_version_set_release_phase(
+	struct ropkg_version *version,
+	enum ropkg_version_release_phase phase)
+{
+	if (phase == ROPKG_VERSION_RELEASE_PHASE_RC) {
+		return;
+	}
+
+	version->v_release_phase = phase;
+}
+
+void ropkg_version_set_upstream_version(
+	struct ropkg_version *version,
+	const unsigned int upstream_version[ROPKG_VERSION_UPSTREAM_DIGIT_MAX])
+{
+	memcpy(version->v_upstream_version,
+	       upstream_version,
+	       sizeof version->v_upstream_version);
+}
+
+void ropkg_version_set_version_release_phase(
+	struct ropkg_version *version,
+	enum ropkg_version_release_phase phase,
+	unsigned int revision)
+{
+	version->v_version_release_phase = phase;
+
+	if (phase == ROPKG_VERSION_RELEASE_PHASE_RELEASE) {
+		version->v_version_release_phase_revision = 1;
+	} else {
+		version->v_version_release_phase_revision = revision;
+	}
+}
+
+void ropkg_version_set_package_revision(
+	struct ropkg_version *version,
+	unsigned int revision)
+{
+	version->v_package_revision = revision;
+}
+
+static const char *release_phase_to_string(
+	enum ropkg_version_release_phase phase)
+{
+	switch (phase) {
+	case ROPKG_VERSION_RELEASE_PHASE_ALPHA:
+		return "alpha";
+	case ROPKG_VERSION_RELEASE_PHASE_BETA:
+		return "beta";
+	case ROPKG_VERSION_RELEASE_PHASE_RC:
+		return "rc";
+	default:
+		return "";
+	}
+}
+
+static unsigned int upstream_version_length(
+	const unsigned int version[ROPKG_VERSION_UPSTREAM_DIGIT_MAX])
+{
+	unsigned int length = 0;
+	for (unsigned int i = 0; i < ROPKG_VERSION_UPSTREAM_DIGIT_MAX; i++) {
+		if (version[i] != 0) {
+			length = i + 1;
+		}
+	}
+
+	if (length < 2) {
+		length = 2;
+	}
+
+	return length;
+}
+
+size_t ropkg_version_to_string(
+	const struct ropkg_version *version,
+	char *out,
+	size_t max)
+{
+	b_stringstream str;
+	b_stringstream_begin(&str, out, max);
+
+	b_stringstream_add(
+		&str,
+		release_phase_to_string(version->v_release_phase));
+
+	unsigned int version_length
+		= upstream_version_length(version->v_upstream_version);
+
+	for (unsigned int i = 0; i < version_length; i++) {
+		if (i > 0) {
+			b_stringstream_add(&str, ".");
+		}
+
+		b_stringstream_addf(&str, "%u", version->v_upstream_version[i]);
+	}
+
+	if (version->v_version_release_phase
+	    != ROPKG_VERSION_RELEASE_PHASE_RELEASE) {
+		b_stringstream_addf(
+			&str,
+			"~%s",
+			release_phase_to_string(
+				version->v_version_release_phase));
+
+		if (version->v_version_release_phase_revision > 1
+		    || version->v_version_release_phase
+		               == ROPKG_VERSION_RELEASE_PHASE_RC) {
+			b_stringstream_addf(
+				&str,
+				"%u",
+				version->v_version_release_phase_revision);
+		}
+	}
+
+	if (version->v_package_revision > 1) {
+		b_stringstream_addf(&str, "-%u", version->v_package_revision);
+	}
+
+	b_stringstream_end(&str);
+	return b_stringstream_get_length(&str);
+}
+
+static int version_compare(
+	const struct ropkg_version *left,
+	const struct ropkg_version *right)
+{
+#define COMPARE(left, right, item)                                             \
+	do {                                                                   \
+		if ((left)->item < (right)->item)                              \
+			return -1;                                             \
+		else if ((left)->item > (right)->item)                         \
+			return 1;                                              \
+	} while (0)
+
+	COMPARE(left, right, v_release_phase);
+
+	for (int i = 0; i < ROPKG_VERSION_UPSTREAM_DIGIT_MAX; i++) {
+		COMPARE(left, right, v_upstream_version[i]);
+	}
+
+	COMPARE(left, right, v_version_release_phase);
+	COMPARE(left, right, v_version_release_phase_revision);
+	COMPARE(left, right, v_package_revision);
+
+#undef COMPARE
+	return 0;
+}
+
+bool ropkg_version_compare(
+	const struct ropkg_version *left,
+	const struct ropkg_version *right,
+	enum ropkg_comparison_op op)
+{
+	int result = version_compare(left, right);
+
+	switch (op) {
+	case ROPKG_OP_EQUAL:
+		return result == 0;
+	case ROPKG_OP_NOT_EQUAL:
+		return result != 0;
+	case ROPKG_OP_LESS_THAN:
+		return result < 0;
+	case ROPKG_OP_LESS_EQUAL:
+		return result <= 0;
+	case ROPKG_OP_GREATER_THAN:
+		return result > 0;
+	case ROPKG_OP_GREATER_EQUAL:
+		return result >= 0;
+	default:
+		return false;
+	}
+}
diff --git a/libropkg/version.h b/libropkg/version.h
new file mode 100644
index 0000000..5f5084b
--- /dev/null
+++ b/libropkg/version.h
@@ -0,0 +1,17 @@
+#ifndef _VERSION_H_
+#define _VERSION_H_
+
+#include <ropkg/version.h>
+
+struct ropkg_version {
+	enum ropkg_version_release_phase v_release_phase;
+
+	unsigned int v_upstream_version[ROPKG_VERSION_UPSTREAM_DIGIT_MAX];
+
+	enum ropkg_version_release_phase v_version_release_phase;
+	unsigned int v_version_release_phase_revision;
+
+	unsigned int v_package_revision;
+};
+
+#endif